The truss shown is composed of 45° right triangles. The crossed members in the center two panels are slender tie rods incapable of supporting compression. Find the forces in all four cross members. The forces are positive if in tension and zero if they attempt to go into compression. Also find the force in member MN (positive if in tension, negative if in compression

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Q: find all the internal forces of the truss.

A: ∑MA=030×20 + 60×40 + 20×60 - RE×80 = 0RE=52.50 k ↑∑V=0RA+RE=30+60+20RA+52.50=30+60+20RA=57.50 k ↑

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Loads and Reactive Forces

Loads are the external influences that a beam experiences under its working conditions. For instance, a beam may be subjected to shear loads, twisting loads, bending moment, and axial loads during its working conditions. Engineers primarily deal with beams and trusses in the civil engineering domain. Due to the influence of loads, it is very crucial to determine the induced stresses and deformation values. These values give an insight into the critical area of the beam that needs to be worked upon to make it fail-safe.