UPSC Civil Service Exam Questions - Engineering

Q1:

A three-hinged parabolic arch rib with hinges at abutments and at crown is under the action of uniformly distributed load 'W' per unit length over its entire span 'l' through its crown. The bending moment at quarter span is

A zero

B Wl2/8

C Wl2/12

D Wl2/24

ANS:A - zero

Three hinged parabolic subjected to uniformly distributed load. Forms a shape of Funicular polygon.

In which the shear force and Bending moment at everysection will be zero.