8/13/2019 SM UNIT 1 AND 2 IMPORTANT QUESTION

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8/13/2019 SM UNIT 1 AND 2 IMPORTANT QUESTION

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E b= 100 KN/mm 2 and s = 11.6 10 !6/C" b = 1#.$ 10 !6/C and also find theshear stress induced in pins.

2. / bar of 30 mm diameter is sub ected to an axial pull of 60 KN . ,he measured

extension on 200 mm $au$e len$th was 0.%% mm and chan$e in diameter was 0.003%

mm.calculate 'oisson s ratio and the +alues of three elastic modulii.

3. i Deri+e a relation for chan$e in len$th of a bar of uniformly taperin$ circular

section sub ected to an axial tensile load 4W . &

ii / reinforced concrete column 500 mm & 500 mm in section is reinforced with

! steel bars of 25 mm diameter5 one in each corner0 the column is carryin$ a load of

1000 'N . -ind the stresses in the concrete and steel bars. ,ake E for steel 6 210 & 10 3

N/mm 2 and E for concrete 6 14 & 103 N/mm 2. &

!. / member /78D is sub ected to loads as shown in -i$.9 . -ind the +alue of ' and

determine the total chan$e in len$th of the bar. 6 21) k:;mm 2.

/7 6 3)) mm0 78 6 2)) mm0 8D 6 3)) mm

/ /7 6 2" mm 20 / 78 61)) mm 20 / 8D 6 ") mm 2 1#

". -ind the stresses in each section of the bar and also the total extension of the bar

shown in -i$. 9. E = 2.1 & 10 5 N/mm 2

8/13/2019 SM UNIT 1 AND 2 IMPORTANT QUESTION

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#. i / steel rod of 25 mm diameter is placed inside a copper tube of 30mm internal

diameter and 5 mm thickness and the ends are ri$idly connected. ,he assembly is

sub ected to a compressi+e load of 250 'N . Determine the stresses induced in the steel

rod and copper tube. ,ake the modulus of elasticity of steel and copper as 200 G(a and

#0 G(a respecti+ely. 1)

ii -ind the total strain ener$y stored in a steel bar of diameter 50 mm and len$th

300 mm when it is sub ected to an axial load of 150 'N . ,ake modulus of elasticity of

steel as 200 & 10 3 )Pa. #

UNIT ! II

PART A

1. Define shear force and bendin$ moment dia$ram?

2. What is meant by o+erhan$in$ beam?

3. Define shear force and bendin$ moment?

!. Write a note on si$n con+entions for S-?

". discuss on axial thrust

#. / cantile+er beam of 3 m lon$ carries a load of 2(

8/13/2019 SM UNIT 1 AND 2 IMPORTANT QUESTION

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1". Write down the section modulus for +arious sections?

PART B

1. / Simply supported beam of # m lon$ is sub ected two concentrated loads of 24

KN and 4# KN at 2 m and 6 m from the left support respecti+ely. >n addition to

carries a udl of 36 ' N/ m o+er the entire span .Draw the shear force and bendin$

moment dia$ram. 1#

2. / 8antile+er beam of 1.5 m lon$ is loaded with a udl of 2 KN/m run o+er a

len$th of 1.25 m free end. >t also carries a point load of 3 KN at distance of 0.25

m from the free end. Draw *+, /:D B),. 1#

3. State any four assumptions made in the theory of simple bendin$ and dri+e the

bendin$ moment e=uation? 1#!. / ,imber beam of rectan$ular section is to support a load of 20 KN udl o+er

entire span of 3.6 m . when the beam is simply supported. >f the depth of the

section is to be twice the breath and the stress induced in timber is not exceed $

N/mm 2.-ind the breath and depth of the cross section .how will you modify the

cross section of the beam0 if it carries a concentrated load of 3 KN placed at the

mid span with the same ratio of breath to depth. 1#

". ,he shear force actin$ on the -I section 100 KN ha+in$ -lan$e 100 mm 20

mm and web portion #0 mm 20 mm . oment of inertia of the section is

3142210 mm 4 .Draw the shear stress distribution across the section. 1#

#. / 7eam of rectan$ular cross section 50 mm wide and 150 mm deep is used as a

cantile+er 6 m lon$ and sub ected to a uniform distributed load of 2 KN/m o+er

the entire len$th. Determine the bendin$ stress at 50 mm from the top fibre0 at the

midespan of the beam5 also calculate the maximum bendin$ stress. 1#