To minimize the total cost of a roof truss, the ratio of the cost of truss to the cost of purlins shall be
A. 1
B. 2
C. 3
D. 4
Answer: Option B
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Rivets connecting flange angles to cover plates in a plate girder are subjected to
A. Horizontal shear only
B. Vertical load only
C. Both (A) and (B)
D. None of the above
When the axis of load lies in the plane of rivet group, then the rivets are subjected to
A. Only shear stresses
B. Only tensile stresses
C. Both (A) and (B)
D. None of the above
Hudson’s formula gives the dead weight of a truss bridge as a function of
A. Bottom chord area
B. Top chord area
C. Effective span of bridge
D. Heaviest axle load of engine
T=2P+r
For economy purpose let avoid cost related to roof covering
Now T=2P. ...So T/P=2