Automobile Designer Interview Question:

Tell us in an orderly manner how the force in the member of a truss be detected using the method of joint?

Submitted by: Muhammad

The steps required to calculate the force are as follows:
☛ > The reaction at the support has to be first calculated.
☛ > Once the reaction is calculated the direction of force of the member is made to make it tensile. On getting the result to be negative the direction assumed is wrong and this implies the force being compressive in nature.
☛ > A joint needs to be selected whose 2 members are not known. The lami`s theorem is used on the joint on which less than three forces are acting.
☛ > After the above process is complete the free body diagrams of the joint needs to be made. Since the system is in equilibrium the condition of Summation of V and H must result in zero.
☛ > After the above step the resolution of forces method needs to be used on the joint on which more than 4 forces are acting.
Submitted by: Muhammad