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Steel Roof Truss DesignBy : Khaerul Sidik

Mochammad Zain Nurfazrie

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Misscellaneous Data

Geometric Structure

Material

Loads (Type & Combination)

Structure Evaluation

Contents



Geometric Structure

2 m 2 m 2 m 2 m 1,5 m 1,5 m 2 m 2 m 2 m 2 m

19 m

4 m



10 m



Material

MaterialSNI 03-1729-2002

Mechanical properties of steel• Modulus of Elasticity,

E = 200000 MPa• Shear Modulus,

G = 80000 MPa• Poisson’s Ratio,

v = 0.3



Table of Mechanical Properties of Structural Steel

SOURCE: SNI 03-1729-2002



Frame Section

1. L90.90.72. L65.65.83. 2L60.60.5



Frame Section



The load that used on this calculation of this roof truss, consist of : Dead Load (DL) Super Dead Load (SDL) Live Load (LL) Wind Load (W) Rain Load (Lr)

Type of Load



Load Combination

U = 1,4 D (Combo 1)U = 1,2 D + 1,6 H + 0,8 W (Combo 2)U = 1,2 D + 1,3 W (Combo 3)D = Dead LoadL = Life LoadH = Rain LoadW = Wind



Load of Structure

• Superimposed Dead Load– Plafond– Roof

• Wind Load– Pressure Wind– Suction Wind

• Live Load– Worker/ People



Superimposed Dead Load(Plafond)

Data Distance between truss = 10 m Expanse distance 1 (L1) = 8 x 2 m Expanse distance 2 (L2) = 1,5 x 2 m Weight of Plafond Component = 18 Kg/m2

Total Weight Wtotal = Weight Component X Distance X L

= 18 Kg/m2 X 6 m X 18,541 m= 2002 Kg

Weight Per Joint, WJoint = Wtotal / n = 182 Kg



Superimposed Dead Load(Roof)

Data Distance between truss = 6 m Distance (oblique) = 9,32 m Weight of Roof Component = 50 Kg/m2

Total Weight Wtotal = Weight Component X Distance X Oblique

= 50 Kg/m2 X 6 m X (2 x 9,32) m= 5592 Kg




Superimposed Dead Load(Plafond & Roof)



Wind Load

Data Distance between truss = 6 m Distance (oblique) = 9,32 m Weight of Wind = 25 Kg/m2

Total Weight Wtotal = Weight X Distance X Oblique

= 25 Kg/m2 X 6 m X 9,32 m= 1398 Kg




Data Distance between truss = 6 m Distance (h) = 1,37 m Weight of Wind = 25 Kg/m2

Total Weight Wtotal = Weight X Distance X h

= 25 Kg/m2 X 6 m X 1,37 m= 205,5 Kg

Weight Per Joint, WJoint = Wtotal / n = 102,75 Kg

Wind Load



Wind Load

Pressure Wind

Suction Wind



Data Distance between truss = 6 m Distance (oblique) = 9,32 m Weight per Unit Volume = 1000 Kg/m3

Load when rain, t = 1 cm = 0,01 m

Total Weight Wtotal = Weight X t X Distance X Oblique

= 1000 Kg/m3 X 0,01 m X 6 m X (2 x 9,32) m= 1118 Kg


Rain Load



Rain Load



STRUCTURE EVALUATION




Capacity Ratio & MisscellaneousData

• Max. Deflection : 30 mm < 51 mm• Total Weight : 628 Kg• Total Cost : Rp6.280.000

First Plan:

1. L70.70.62. L25.25.33. 2L70.70.6



Capacity Ratio & MisscellaneousData

• Max. Deflection : 14 mm < 51 mm• Total Weight : 1013.32 Kg• Total Cost : Rp10.133.200

Second Plan:

2L70.70.6 2L80.80.6L25.25.3 L75.75.12



Joint Reactions(Envelope)

N, mm, C



Axial Force(Envelope)

N, mm, C

58

4



Shear Force(Envelope)

N, mm, C

43 42



Moment(Envelope)

N, mm, C

43



Deformed Shape(Envelope)

N, mm, C

6

Lendutan yang terjadi < Lendutan yang diijinkan 14 mm < 51 mm OK!



Total Weight & Cost

• Total Weight : 1013.32 Kg

• Total Cost : Rp10.133.200



Fix Roof Truss Design

• 2L80.80.6 = 9• L70.70.6 = 22• L75.75.12 = 10

Total = 41 Frames



Thanks for Attention!



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