Given: The beam cross-section has the dimensions shown and a thickness of 0.5 in. It is bent about its weak axis. Fy = 50 ksi Required: For fully plastic behavior: (a) Draw the stress diagram (b) Calculate Z (c) Determine the moment capacity, OMn (kip-ft) Ans: Mn = 15.5 kip-ft 3

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Laws of Equilibrium

A body is said to be in equilibrium if the system of forces acting on the body tends to keep the body at rest, in other words, there is no translation motion or net torque on the body. Under such conditions, the equilibrium conditions are to be applied to analyze the condition. The branch of mechanics that deals with this condition is known as 'statics'. Under equilibrium, there are no net forces on the body.