Q3: Analyze the truss shown using substitute member method. Assume roller at joint (a) and hinge in joint (c). 2kN 3mb 3m 4 m 1 m

If P = 1137, Q = 1495, and R = 1731, determine the force in member ND (in kips) of the K truss using the method of sections. HINT: Use sections aa and bb.

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

The steel truss (E =200 GPa) shown in figure below has a cross-sectional area of 1920 mm². Determine: a. The largest allowable load F if the change in length of member BD is not to exceed 1.6 mm and a factor of safety of 2.5. b. The displacement of support D due to the load calculated in part a. 5m 6m A C F