(DCE 311)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper I — STRUCTURAL ANALYSIS — I

Time : Three hours Maximum : 75 marks

Answer ALL questions. (5 15 = 75 marks)

Answer Question No. 1 Compulsorily.

Answer ONE question from each Unit.

Any data missing may be assumed suitably.

1. (a) State Castigliano’s theorem - I.

(b) What is the strain energy in a simply supported beam of span, l subjected to a moment M throughout its length?

(c) Give the generalised form of Claypeyron’s three moments equation.

(d) What are the advantages of fixed beams over simply supported beams?

(e) State Muller-Bresslau principle.

(f) What is the Maxwell’s reciprocal theorem?

(g) What are the different methods available to find deflections in statically determinate structures?

(h) What will be the expression for fixed moment due to sinking of support?

(i) Draw the influence line diagram for support reaction at ‘A’ for the beam shown in Figure 1.

Fig. 1

(j) What will be the expression for displacements by strain energy method in case of pin jointed trusses?

(k) What do you mean by a fixed beam?

(l) Give expressions for fixing moments of a fixed beam carrying point load at the center.

(m) What is the value of prop reaction at the end of cantilever carrying udl over the entire span and proped at the free emf?

(n) Draw the influence line diagram for the beam shown in figures for support reaction AR .

Fig. 2

UNIT I

2. Using Castigliano’s theorem, determine the vertical and horizontal deflection at ‘ A ’ for the post loaded as shown in figure 3 below. Assume uniform flexural rigidity.

Fig. 3

Or

3. Find the vertical and horizontal deflections of the joint ‘C’ of the pin jointed truss as shown in figure ‘4’. The area of the horizontal member is 150 mm2 and the areas of the members AC and BC are 200 mm2 each. Take 2mmkN200E .

Fig. 4

UNIT II

4. A system of four wheel load 80 kN, 120 kN, 60 kN and 40 kN spaced 4 m, 2 m and 2 m respectively crosses a simply supported span of 20 m from left to right with the 40 kN load leading. Determine the absolute maximum bending moment in the span, reactive forces and state under which load the absolute maximum BM does it occur.

Or

5. Draw the influence line diagrams for the forces in the top chord members ‘HI’, IJ, bottom chord members ‘AB’, ‘BC’ vertical member ‘IC’ and finally diagonal member ‘ID’ of the through type bridge truss shown in figure 5.

Fig. 5

UNIT III

6. A fixed beam of span ‘L’ is subjected to a concentrated load ‘w’ at a distance ‘a’ from end ‘A’ as shown in Fig. 6. Determine the end moments developed.

Fig. 6

Or

7. A proper cantilever with over hang loaded as shown in figure 6 with point load at free end. Find the overhang length so that the deflection at free end is zero. Find the prop reaction.

UNIT IV

8. Find the forces in the members of the frame shown in figure 7. All the members have the same cross-sectional area, and are of the same material. Area of the cross-section of each bar = 1000 mm2 and E = 2 102 N/mm2.

Fig. 7 Or

9. Analyse the frame shown in figure 8 by strain energy method.

Fig. 8

———————— (DCE 312)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper II — ENVIRONMENTAL ENGINEERING – I

Time : Three hours Maximum : 75 marks

All questions carry equal marks.

Answer Q. No. 1 compulsorily. (15)

Answer ONE question from each Unit. (4 15 = 60)

1. (a) Define per capita demand. What is the average per capita demand for Indian cities as per BIS?

(b) Define fire demand. Write National Board of fire underwriter’s formula for fire demand.

(c) What are the different types of pumps used in water supply?

(d) Name the two different portions of a river intake.

(e) Name the disease caused due to the presence of excess nitrates in water.

(f) What is the name of culture medium used in standard plate count test?

(g) Name the precipitate formed when copper as is used as coagulant.

(h) What is meant by discrete particle?

(i) Name any two operational problems of filters.

(j) What is meant by chloramines? Give one example.

(k) Name any two methods of removal of permanent hardness.

(l) Write any two defluoridation techniques.

(m) What is air valve and where do you use it?

(n) What is single stack system of house plumbing?

UNIT I

2. (a) Explain the need for protected water supply system. Write the objectives of protected water supply systems.

(b) Predict the population of a town for the year 2010 and 2020 AD. Using the following data, in any two methods.

Years : 1950 1960 1970 1980 1990 2000

Population : 38,000 47,000 60,000 78,000 1,00,000 1,35,000

Or

(c) Discuss the factors affecting the percapita demand. Explain the fluctuations in water demand.

(d) Explain the factors affecting the selection of site for locating an intake structure. Describe a typical river intake.

UNIT II

3. (a) Describe the testing procedures for the analysis of biological parameters in water.

(b) Draw the layout of a typical water treatment plant and explain the units

sequentially.

Or

(c) Describe the discrete particle theory and derive an equation for setting

velocity.

(d) Explain the theory of coagulation and list out various chemicals used for

coagulation.

UNIT III

4. (a) Explain various constructional and operational features of rapid sand filter.

(b) What are the various characteristics of ideal disinfectant? Explain break point chlorination.

Or

(c) Describe various methods for the removal of permanent hardness present in water.

(d) Explain various defluoridation techniques.

UNIT IV

5. (a) Differentiate Tree and Grid iron systems of distribution layouts. (b) Explain Hardy-cross method for solving distribution networks.

Or (c) Describe various appurtenances used in water distribution systems. (d) Explain the principles governing house drainage. List out various sanitary fittings.

——————

(DCE 313) B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year) Civil Engineering

Paper III — WATER RESOURCES ENGINEERING — I

Time : Three hours Maximum : 75 marks All questions carry equal marks.

Answer Question No. 1 and any FOUR questions. Assume suitable data wherever necessary.

1. (a) Define hydrology. (b) Differentiate between surface runoff and base flow. (c) What are the assumptions made in deriving unit hydrograph? (d) Distinguish between confined aquifer and unconfined aquifer. (e) Distinguish between specific yield and specific retention. (f) List out any two advantages of Furrow irrigation. (g) Define duty and delta. (h) Define field capacity. (i) Distinguish between water distribution efficiency and consumptive use

efficiency. (j) Define balancing depth. (k) Give the neat sketches of off-take alignments. (l) Differentiate between storage head works and diversion head works. (m) What is method of independent variables? (n) What is canal escape? What are different types of escapes?

UNIT I 2. (a) What is runoff? What are the methods of computing runoff from a catchment

area? Explain the rational method of storm water flow. (b) What do you understand by dependable rainfall? How do you analyze the

available data to obtain 75% dependable annual rainfall? Or

3. (a) Define unit hydrograph. Describe the method for deriving unit hydrograph from complex storm.

(b) The values of drawdowns were observed in an artesian well located at a distance of 3 m from a fully penetrating artesian well pumping at 2.2 liters per second. The drawdowns were 0.75 and 0.95, after two and four hours of pumping respectively. Determine storage coefficient (S) and transmissivity (T) of the aquifer.

UNIT II 4. (a) What is irrigation? Discuss in brief various methods of surface irrigation. (b) Discuss the functional requirement of multipurpose projects.

Or

5. (a) Distinguish between (i) Sprinkler irrigation and drip irrigation (ii) Furrow method and zig-zg method.

(b) The field capacity and permanent wilting point for a given soil are 35% and 15% respectively. Determine the storage capacity of soil within the root zone of the soil which may be taken as 80 cm. At a given time the soil moisture in the field is 20% and farmer applies 25 cm of water. What part of this water would be wasted? Assume porosity of soil as 40% and relative density as 2.65.

UNIT III 6. (a) Describe Kennedy's silt theorem. A channel is silting badly in the head

reach. How would you proceed to determine its cause and what remedies would you suggest?

(b) A trapezoidal channel section has to be designed for the following data : Discharge , Q = 30 cumecs Silt factor, f = 1 Side slopes = 2

1 : 1 Or

7. (a) Explain the effects of water logging and causes of water logging. (b) Design a concrete lined channel to carry a discharge of 40 m3/s at a slope of 1

in 10000. The side of the channel are 1 21 : 1 and Manning's N = 0.018.

UNIT IV

8. (a) Explain with the help of a diagram, the various components of parts, along with their functions, of a diversion head work.

(b) Discuss in brief various causes of failure of weirs and their remedies.

Or

9. (a) What do you understand by a fall in a canal? Why it is necessary? How do you select its location.

(b) What is an outlet? Write down the requirements that an outlet should fulfill.

———————

(DCE 314)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper IV — DESIGN OF CONCRETE STRUCTURES — I

Time : Three hours Maximum : 75 marks

UNIT I

Answer ALL the following. (5 15 = 75)

1. (a) Explain balanced, under reinforced and over reinforced R, C sections. (b) Determine the moment of resistance of a rectangular R, C beam section of

300mm wide 560 mm effective depth reinforced with 2 nos of 16 mm diometer bass on compression side and 4 nos of 20mm diameter bass on tension side. The effective cover on compression side may be assumed as 40mm, use M20 glade concrete and Fe415 glade steel. Use working stress method.

Or

2. (a) What are the assumptions made in working stress design of R, C beams and explain the same?

(b) Design a simply supported rectangular beam of span 7.5m and loaded with a total udl of 15kN/m over the entire span. Use M20 grade concrete and Fe 415 grade steel.

UNIT II

3. (a) What do you understand by limit state. Discuss various limit states? (b) Determine the neutral axis depth of the rectangular R.C. beam of size

300mm 600mm (effective depth) reinforced with 4 nos 20mm dia on tension side. Use M20 grade concrete and Fe 415 grade steel. Use limit state method of design.

Or

4. A T-beam is singly reinforced and has the following sectional properties. Estimate the ultimate moment of resistance of the section using I.S. code provision.

Width of flange = 1200mm, thickness of flange = 150 mm, width of Nb = 300mm, effective depth = 750mm, area of tension reinforcement = 5520mm2. Use M20 grade concrete and Fe415 grade steel. Use limit state method.

UNIT III

5. A reinforced concrete beam has a support section with a width of 250mm and effective depth of 500mm. The support section is reinforced with 3 bars of 20mm diameter on the tension side. 8mm diameter two legged stirrups are provided at spacing of 20mm centres. Using M20 grade concrete and Fe415 grade steel, estimate the shear strength of the support section.

Or 6. A rectangular beam 250mm 600 mm has 6 nos of 20mm bass on the tension side

and 3 nos of 16mm on compression side. This beam is used as a cantilever beam of 4m span carrying a BIM of 200kN m at service loads, assume 60% of the above moment is due to permanent loads and load being uniformly distributed on span, calculate both short and long term deflections of beam. Discuss whether these values satisfy the code requirements.

UNIT IV 7. Design a R.C. rectangular beam 250mm 500mm over an effective span of 5m

simply supported. The beam carries a superimposed load of 20 kN/m excluding self weight of beam. Use M20 glade converte and Fe 415 glade steel use working stress method.

Or

8. Design one of the flights of stairs of a school building spanning between landing beams to suit the following data. Type of staircase-waist slab type, No. of steps in flight = 12, tread = 300mm, rise = 160mm, width of landing beam = 400mm, use M20 grade concrete and Fe 415 grade steel.

UNIT V

9. Design the lintel and sunshade over an opening 2m wide in a wall 300mm thick. The length of the sunshade is 750mm. The live load on sunshade is 500 N/m2 and the density of masonry is 19 kN/m3. The height of the opening is 2m with the height of floor being 3.2m. Use M20 grade concrete and Fe415 grade steel.

Or

10. Design a rectangular beam 300mm wide and 600mm deep subjected to a B.M. of 80 KN.m, shear force of 80KN and a twisting moment of 30KN.m. Use M20 grade concrete and Fe415 grade steel. Use limit state method.

———————

(DCE 315)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper V — DESIGN OF STEEL STRUCTURES – I

Time : Three hours Maximum : 75 marks

Answer ONE question from each Unit. (5 15 = 75)

All questions carry equal marks.

Use of IS 800-1984 and steel tables is permitted.

UNIT I

1. A double riveted double cover butt joint is used to connect plates 12mm thick. Using Unwin’s formula, determine the diameter of rivet, rivet value, gauge and efficiency of joint. Take 150at Mpa, 80vf Mpa and 250pf Mpa.

Or

2. Design a tension member consisting of a pair of angles (back to back) and connected by the short legs to the same side of gusset plate. The member is to carry a pull of 250 kN. Adopt stress as per IS 800-1984.

UNIT II

3. Design a rolled steel beam section column to carry an axial loan 1100 kN. The column is 4 m long and adequately restrained in position but not in direction at both ends.

Or

4. A column effectively held in position but not in direction at their end is 4 mts long and carries an axial load of 700 kN and an end moment of 35000 kN mm. Design the column if only rolled steel beam sections are available. Adopt stress as per IS800-1984.

UNIT III

5. Design a suitable riveted base plate connection for ISWB 200 column subjected to an axial load for 300 kN and a moment of 450 KN-mm at the bottom in the plane of web.

Or

6. Design a grillage foundation to carry a stanchion, designed to carry 1000 kN. The base plate of the stanchion, is 600 mm square in size. The bearing pressure of earth is limited to a value of 200 kN/m2. Take the allowable bending stress and the allowable average shear stress as per IS 800-1984.

UNIT IV

7. Design a rolled steel I-section for a simply supported beam with a clear span of 8 m. It carries a uniformly distributed load of 100 kN per metre exclusive of self-weight of the girder. The beam is laterally unsupported.

Or

8. Check the beam section ISWB 500 @ 1.451 kN/m against web crippling and web buckling if reaction at the end of beam is 180 kN. The length of bearing plate at the support is 120 mn. Design bearing plate. The bearing plate is set in masonry wall.

UNIT V

9. A bracket is subjected to a load of 150 kN as shown in Fig.(1) the bracket is welded to a stanchion by means of three weld lines as indicates in Fig.(1). Find out the size of the welds so that the load is carried safely.

Fig. 1

Or

10. An ISMB 500 @ 0.869 kN/m transmits an end reaction of 150 kN to the flange of stanchion. ISHN 250 @ 0.510 kN/m. Design a unstiffened seated connections. Use 25 mm diameter rivets.

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper VI — GEO-TECHNICAL ENGINEERING — I Time : Three hours Maximum : 75

marks Answer Question No. 1 is compulsorily.

(15 marks)

Answer ONE question from each Unit. (4 15 = 60)

1. (a) How are soils formed?

(b) Define the term "Draft".

(c) What is meant by porosity?

(d) Write any two methods of water content determination.

(e) Define Toughness index.

(f) What is meant by Thixotropy?

(g) Write any two factors affecting permeability.

(h) What is meant by quick sand condition?

(i) What is a flow net?

(j) What is meant by compaction?

(k) Which type of rallers are useful for finishing operations after compaction of fills?

(l) What is secondary consolidation?

(m) What is electro-osmosis?

(n) State the different types of laboratory shear strength tests.

UNIT I

2. (a) Derive from the fundamental the relation among void ration (e). Water content (w), specific gravity of solids (G) and degree of saturation (Sr).

SrwGe

(b) A fully saturated clay has a water content of 40% and bulk density of 3grams/cm95.1 . After drying the dry unit weight is 3g/cm80.1 . Find the

specific gravity of soil solids and shrinkage limit of clay.

Or

(c) Explain the determination of liquid limit by casagrande method.

(d) The wet weight of a soil sample is 168 gms. Its volume is 90 cc. on over drying the weight is 140 gms. Determine water content, dry density and void ratio. Take specific gravity as 2.7.

UNIT II

3. (a) Show the Indian standard classification for fine grained soils on plasticity chart. Explain all the symbols used in the chart.

(b) Explain the various factors affecting permeability coefficient.

Or (c) Write a short notes on (i) Seepage velocity. (ii) Laminar flow through porous media.

(d) A soil sample 45 cm long and 2cm30 in cross-sectional area is used to conduct a constant head permeameter test under a constand head of 90 cms, the quantity of flow collected was 3cm400 in 100 seconds. If the porosity is 35% compute coefficient of permeability and seepage velocity.

UNIT III

4. (a) Define Total effective and null pressures and give their relationship for saturated soils. Derive an equation for quick and condition (critical hydraulic gradient) considering an upward flow condition.

(b) What is a flow net? State its properties and applications. What is the quantity of seepage between two successive flow lines and equipment lines?

Or (c) What is compaction? Mention its advantages and list out the factors

influencing the compaction. (d) The results of standard proctor's test are as given below:

Water content (%) 9.2 12.7 15.5 19.3 20.2

Bulk density ( )t/m( 3 1.52 1.75 1.95 2.05 2.02

Plat the compaction curve and determine the optimum moisture content and maximum dry density plot 85% saturation line and 15% air voids line.

UNIT IV

5. (a) Summarise the assumptions made in Terazaghis one dimensional consolidation theory. Also mention some of the limitations.

(b) Explain the laboratory vane shear test.

Or (c) What is meant by coefficient of consolidation, indicate its importence? Give

equation and explain the terms. (d) Write a short notes on (i) Mohr-coulomb theory (ii) Different drainage conditions.

——————————

(DCE 321)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year) Civil Engineering

Paper I — STRUCTURAL ANALYSIS — II

Time : Three hours Maximum : 75 marks

Answer Question No. 1 is compulsory. (15 marks)

Answer ONE question from each Unit.

(4 15 = 60) 1. (a) What are the advantages of slope deflection method over moment distribution method? (b) What are the assumptions made in slope deflection method? (c) What is the effect of sinking of supports? (d) What do you mean by distribution factor? (e) Stiffness method is preferred over flexibility method. Comment. (f) Three members OA, OB and OC are meeting at O. Write the equilibrium

equation at the joint if it is rigid. (g) What is sway in frames? (h) What do you mean by arch action? (i) What are the assumption made in portal method of analysis? (j) Under what conditions do you use (i) substitute frame method (ii) cantilever method. (k) What is the difference between a curved girder and a straight girder? (l) Draw the influence line diagram for the horizontal reaction for a three hinged arch. (m) What is the change in dip in a suspended wire subjected to a temperature change? (n) Write down the general cable theorem for HY.

UNIT I 2. Analyse the continuous beam shown in fig. 1 by using slope deflection method.

Sketch S.F. and B.M. diagrams.

Fig.1. Or

3. Analyse the frame shown in fig. 2 using slope-deflection method. Draw BMD. All the members have same flexural rigidity.

Fig.2. UNIT II

4. Analyse the continuous beam shown in fig. 3 by using moment distribution method. Sketch the shear force and B.M. diagrams.

Fig.3. Or

5. Draw the B.M. diagram for the frame shown in fig. 4 by using moment distribution method. IAB = ICO = I, IBC = 2 I.

Fig.4.

UNIT III

6. Analyse the Building frame subjected to horizontal forces as shown in Fig.5 using Portal method.

Fig.5.

Or

7. Analyse the frame shown in fig.6 by using Kanb’s method.

Fig.6.

Or

UNIT IV

8. A three hinged parabolic arch has a span 40 m and a rise of 4 m. Using the influence lines, determine the maximum horizontal thrust H, and the moment at the quarter span point from the left hand support, when two loads of 120 kN and 180 kN at 3 m centre to centre move from left to right with 120 kN load leading.

Or

9. A cable is supported over a span of 60 m. The supports are 2 m and 8 m above the lowest point of the cable. If the load on the cable is 15 kN/m. Compute

(a) the length of the cable (b) Horizontal pull in the cable and (c) tension in the cable.

——————

(DCE 322) B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper II — TRANSPORTATION ENGINEERING — I

Time : Three hours Maximum : 75 marks

All questions carry equal marks.

Answer Question No. 1 is compulsory.

(15 marks)

Answer ONE question from each Unit. (4 15 = 60)

1. (a) What is highway drainage? (b) How can soil erosion be controlled? (c) What is an overlay? What are the four different overlay combinations? (d) What is mud jacking? (e) What is the reason for the formation of alligator cracking? (f) What are the essential properties to be possessed by a joint scalant? (g) Mention the two modes of construction of cement concrete slab. (h) What is Interface treatment? (i) Define the term ‘Radius of relative stiffness’ and express it mathematically. (j) Define CBR value of a soil sample. (k) What is Group Index method? (l) What is the difference between Cutback Emulsion and Bituminous

Emulsion? (m) What is Compensation in Gradient an horizontal curves? (n) What are the different types of transition curves? (o) What is Indian Roads Congress?

UNIT I

2. (a) Describe the salient features of the second twenty year road development plan and the third twenty year road development plan.

(b) How are the various road patterns classified? Explain with sketches.

Or

3. (a) What is highway alignment? What are the basic requirements of an ideal alignment?

(b) Enumerate on the different drawings prepared in a highway project.

UNIT II

4. (a) What is a horizontal curve? What are the effects that a vehicle is subjected to, while negotiating a horizontal curve?

(b) What are the functions of a transitional curve in highway alignment? How is the length of a transition curve determined?

Or

5. What are the desirable properties of road aggregate? Explain the different tests to be carried out on a sample of road aggregate to test its applicability for road constitution.

UNIT III

6. (a) Explain the different design methods for flexible pavements. (b) How are temperature stresses induced inside a cement concrete pavement?

Explain the mechanism with equations.

Or

7. (a) Explain the construction procedure for Bituminous concrete pavements with gradation of aggregate used.

(b) Design the spacing of expansion and contraction joints in cement concrete pavements.

UNIT IV

8. (a) How are the maintenance activities of water bound macadam roads and Bituminous surfaces carried out in the field?

(b) Describe the procedure for conducting Benkelman Beam deflection study in the field.

Or

9. (a) What is sub-surface drainage system? Give the complete design of sub-surface drainage system.

(b) Describe the construction procedure of roads in water-lagged areas.

—————

(DCE 323)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper III — WATER RESOURCES ENGINEERING — II

Time : Three hours Maximum : 75 marks

Answer Question No. 1 Compulsorily. (1 15 = 15)

Answer ONE question from each Unit. (4 15 = 60)

1. (a) What are different methods of discharge measurement? Write down formula for area-velocity method?

(b) Write down any ‘2’ basic factors controlling processing of meandering.

(c) What are difficulties of cross-drainage works?

(d) What is a dam?

(e) What is the difference between the gravity dam and rock fill dam?

(f) What is meant by uplift pressure?

(g) Write any two assumptions of gravity analysis.

(h) Define capacity factors utilization factor of a power house.

(i) What is the filter criteria for earth dam?

(j) Discuss energy dissipitation below spillways.

(k) Compare standard crested shaft spillway and flat crested shaft spillway.

(l) Describe the effect of wave pressure and silt pressure on gravity dams.

(m) Explain the qualities of a good siphom.

(n) Give the classification of reservoirs.

(o) What is a culvert?

UNIT I

2. (a) What are different types of cross drainage works? Explain each one in detail.

(b) Explain about pivot point method.

Or

3. What are different classification of aqueducts and syphon aqueducts? Discus one in detail.

UNIT II

4. (a) What are factors affecting the selection of site for a reservoir? (b) What are limitations of Bligh’s creep theory? How are they corrected in

Lane’s weighted creep theory? Or

5. (a) What do you understand by single purpose and multipurpose reservoirs? Under what condition do you go for multipurpose projects?

(b) The following table gives monthly runoff of a river. Draw a mass curve and find the capacity of reservoir for 100% utilization of water at constant regulated flow

Month : April May June July Aug. Sep. Oct Runoff (m3/sec) : 80 40 9 10 20 40 30 Month : Nov. Dec. Jan. Feb. March Runoff (m3/sec) : 20 40 50 60 120

UNIT III

6. (a) What are different modes of failure of gravity dam and criteria for stability requirements?

(b) Explain design of gravity dams by single step method. Or

7. Design the practical profile of a gravity dam with the following data. R.L of base of dam = 1320 R.L of HFL = 1355 Specific gravity of dam material = 2.4 Height of waves = 1m Safe compressive stress = 120t/m2.

UNIT IV

8. What are different types of spillways? Explain each one.

Or

9. (a) Discuss the different conditions governing the relationship between JHC and TWC and the corresponding energy dissipation arrangement required.

(b) Describe the methods of stability analysis of U/S slope during sudden draw down.

———————

(DCE 324)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper IV — DESIGN OF CONCRETE STRUCTURES — II

Time : Three hours Maximum : 75 marks

Answer ONE question from each Unit. (5 15 = 75)

Use of IS 456-2000 is allowed

Missing data maybe assumed suitably.

UNIT I 1. Design a short R.C. column of not more than 690mm in diameter to carry an axial

load of 5080kN. Use spiral reinforcement. Use M25 grade of concrete and Fe415-steel reinforcement. Sketch reinforcement details neatly, (WSM).

Or 2. A reinforced concrete continuous beam consists of two spans each of 6m. The

characteristic dead load is 18kN/m and the characteristic live load of 24 kN/m. Draw bending moment envelope after maximum redistribution.

UNIT II

3. Design a rectangular slab (supported on its all the four edges) over a class-room of size 4.8m 6.2m. Two adjacent edges of the slab are discontinuous and the remaining two edges as continuous. A finishing surface of cement concrete of 20mm shall be provided over the slab. The slab shall be used as a class-room floor. M20 grade of concrete and HYSD bars shall be used.

Or

4. Design an interior panel of a flat slab 6m 5m for a line load of 8kN/m2. Use M20 concrete and Fe415 steel and provide two way reinforcement. (LSM).

UNIT III

5. Design a circular concrete axially load column to carry an axial load of 1200kN including dead load live and self weight. The column shall remain continuous through reinforced concrete beam and slab floors at both the ends. Provide M20 grade of concrete and HYSD steel bars. The clear height between the floor and soffit and shallow beam is 6.0mts.

Or

6. Design a circular column to carry an axial load of 1500kN using (a) Lateral ties (b) Helical reinforcement. Use M25 grade concrete and Fe415 steel. Use LSM.

UNIT IV

7. (a) Explain indetail the different types of retaining walls with neat sketches. (b) Explain how stability of retaining wall in checked.

Or

8. Design a cantilever retaining wall to retain a backfill of sand and gravel without fire particles of 3.20mts height. A live load surcharge of 12kN/m2 shall be acting over the horizontal surface of the backfill M20 grade of concrete and HYSD steel bars shall be used. The maximum bearing capacity of the soil is 160kN/m2.

UNIT V

9. A rectangle column 450mm 600mm transfers a dead load of 880 kM and a live load of 1420kN without any moment and there is no over burden. The safe bearing capacity of soil is 140 kW/m2, M20 grade concrete and Fe415 grade steel is used. Design the vector girder footing to support the column.

Or

10. Design a combined rectangular footing for two columns C1 and C2 spaced at 3.0m apart. Characteristic loads on C1 and C2 are 800kN and 1200kN respectively and the size of the columns is 350 mm 650 mm where 650 mm size is along C1–C2. Width of the footing shall be 2.5mts the SBC of soil is 180kN/m2.

———————

(DCE 325)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper V — DESIGN OF STEEL STRUCTURES — II Time : Three hours Maximum : 75 marks

Answer ONE question from each Unit.

All questions carry equal marks.

Use of IS 800 – 1984 and steel tables is permitted.

UNIT I

1. Design an over head riveted steel rectangular flat bottom tank of capacity 70000 litres. The available width of plates is 1.22 m and length upto 6.1 m. The staging consists of 4 columns, spaced 4.88 3.66 m and the bottom of the tank is 9.14 m above the ground level. Design

Or

2. Design a rectangular flat bottom tank of 8 m 6 m 2.5 m if the width of the plates available is 1.2 m a

UNIT II

3. (a) What is the main purpose of providing gantry girders in industrial buildings?

(b) Explain in detail the loads on gantry girders and also explain installation of gantry girders.

Or 4. Design a simply supported ‘Gantry girder’

( yf = 250 MPa) to be used in an ‘Industrial building’ for the following data : Crane capacity = 100 kN Weight of crab = 35 kN Weight of crane (including crab) = 160 kN Minimum clearance between crane hook and gantry girder = 1.00 m Wheel base = 3.00 m, Distance between centre-centre of gantries = 20.0 m Distance between c/c gantry columns = 6.0 m Crane type = M.O.T. (manually operated travelling crane).

UNIT III

5. (a) Explain briefly the different types of roof trusses with a neat sketches. (b) What are the different types of loads considered while designing roof trusses

and explain load combinations? Or

6. In a roof truss the principal rafters have a length of 2.8 m are subjected to a compressive force of 180 kN and tensile force of 70 kN. The main slings of the truss are subjected to a tensile force of 90 kN and compressive force of 35 kN and have a length of 3.0 m. Design the members using steel with 250yf N/mm2.

UNIT IV

7. What is the necessity to provide plate girders? And explain briefly with neat sketches the components of a plate girder.

Or

8. A simply supported plate girder of span 18 m carries a uniformly distributed load of 80 kN/m exclusive of its self weight. The compression flange of the girder is laterally restrained. Design the mid span section of the plate girder. (Riveted connections need not be designed). Assume only vertical stiffness are used. Take

250yf N/mm2.

UNIT V

9. (a) Explain briefly the different types of end bearings. Mention the factors which helps in selection of type of end bearings.

(b) Explain briefly the following with neat sketches : (i) Rocker bearings (ii) Roller bearings

Or

10. The dead load, live load and impact load reaction at the end of a bridge girder as 1300 kN. The vertical reaction of each end of the girder due to overturning effect of wind is 60 kN. Design the roller bearing. The least allowable perpendicular distance between the faces of adjacent rollers after their revolved position may be taken as 6 mm. The centre of roller travels 25 mm.

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(DCE 326)

B.Tech. DEGREE EXAMINATION, DECEMBER 2009.

(Examination at the end of Third Year)

Civil Engineering

Paper VI — GEO-TECHNICAL ENGINEERING — II Time : Three hours Maximum : 75 marks

Answer Question No. 1 compulsorily. (15 marks)

Answer ONE question from each Unit. (4 15 = 60)

1. (a) How would you decided the depth of exploration and the lateral extent of the investigation?

(b) Name two methods of drilling bore holes. (c) What do you understand about disturbed and undistorted samples? (d) What are the various methods for determining the level of the grounds water

table? (e) Write an expression for the vertical stress at a point due to a point load,

using Boussinesq's theory. (f) What do you understand by contact pressure? (g) Why Wester gaard's theory is used? How is it different from Boussinesq's

solution? (h) Define earth pressure at rest. (i) Write any two methods for improving the stability of slopes. (j) Mention any two effects of water table on the bearing capacity of the soil. (k) How would you determine the time-settlement curve is the field? (l) What is negative skin friction? (m) What is the function of well cap? (n) How can you say a well foundation is move suitable than the other types of

foundation?

UNIT I

2. (a) Discuss various types of soil samples for obtaining undisturbed samples with neat sketches.

(b) Describe open excavation methods of exploration. What are their advantages and disadvantages?

Or

3. (a) Discuss the basis of the costruction of Newmark's influence chat. How is it used?

(b) Determine the vertical stress at a point ‘p’ which is 3m below and at a radial distance of 3 m from the vertical load of 100 kN. Use Wester gaard's solutions.

UNIT II

4. (a) What are the assumptions of Rankine's theory? Derive the expressions for active pressure and passive pressure.

(b) A retaining wall has a vertical back and is 8 m high. The back face of the wall is smooth and the upper surface of the fill is horizontal. Determine the thrust on the wall per unit length. Take

2kN/m10C , 3kN/m19r and 20 . Neglet tension.

Or

5. (a) Describe Culmann's method for the stability analysis of homogeous slope. What are its limitations?

(b) Determine the factor of safety with respect to Cohension only for a submerged embankment 25 m high whose up stream face has an inclination of 45. The soil has the following properties; 2/40 mkNC , 10 ,

3/18 mkNrsat . The relevant stability, number is equal to 0.108.

UNIT III

6. (a) Explain clearly how plate load test is carried out and also explain the interpretation of results.

(b) There is a layer of soft clay 4 m thick under a newly constructed building. The over burden pressure over the centre of clay layer is 300 kN/m2. Compute the settlement if there is a increase in pressure due to construction of 100 kN/m2. Take ,5.0 7.2G . The water content of deposit was found to be 50%.

Or

7. (a) Differentiate between normally consolidated and the over consolidated soils. How would you determine the over consolidation pressure.

(b) A footing of mm 5.15.1 is located at a depth of 1.2 m below the ground surface. The soil properties are 2/15 mkNC , 20 , 3/8.15 mKNr and

3/8.17 mkNrsat , (for 20 , 8.14CN ; 4.6qN ; 4.5rN ). Find the safe load carrying capacity of footing adopting a factor of safety of 3.0 if

(i) Water table is at a depth of 3 m below ground surface (ii) Water table at a depth of 1.8 m below ground surface. (iii) Water table at a depth of 0.6 m below ground surfaces.

UNIT IV

8. (a) How would you estimate the group capacity of piles in (i) sand (ii) clay. (b) Explain the process of well sinking.

Or

9. (a) Describe various methods for the design of well foundations. What are their relative merits?

(b) In a 1B pile group, the pile diameter is 0.35 m and center to center spacing of piles is a savave group is 1.2 m. If 2/50 mkNCu , determine whether the failure will occur asblock failure or when the piles act individually. Neglect the end bearing at the tip of pile. All piles are 12 m long. Take 7.0 for shear mobilization around each pile. Also determine the safe load on his group.

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