3 m mm 8@1.8m = 14.4m The bottom chord of the truss is composed of 2 Nos. ISA 60 x 60 x 6 with gusset thickness of 10 mm (back to back and both sides of the gusset). Calculate the factored load carrying capacity of the member under compression only. (ISA 60 × 60 × 6 : A = 684 mm², lxx = lyy= 226000 mm4, Cxx = Cyy = 16.9 mm) 80 90 100 110 120 130 140 150 KL/r fcd (MPa) 118 105 92.6 82.1 73 65.2 58.4 52.6 Longitudinal ties are provided at alternate node of the bottom chord.

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.