Q4/ The rigid beam is supported by a pin at A and two steel wires BD and CE. Each rod has a diameter of d. If the load P on the beam causes the end C to be displaced h downward, determine the normal strain developed in wires CE and BD and the applied load P. Assume E steel = 200 Gpa and a= 1.75 m, b= 1m, d= 50mm, h= 10mm D 2а B b +a - a –

5)Determine the forces in all members of the truss. There is a pin at A and a roller at D. In answers for truss forces remember you must always indicate if a member is in tension (T) or compression (C); for example, if there was a member JK carrying a 2 kip compressive load the answer would be FJ = 10 K (C) 3 m G 10 kN 6kN E -2.5 m- -1.5 m-1.5 m- -2.5 m

A bridge girder AB on a simple span oflength L =14 m supports a distributed load of maximumintensity q at mid-span and minimum intensityq/2 at supports A and B that includes the weight ofthe girder (see figure). The girder is constructed ofthree plates welded to form the cross section shown.Determine the maximum permissible load q basedupon (a) an allowable bending stress σallow =110 MPaand (b) an allowable shear stress τallow = 50 MPa.