Given: An assembly of two beams ABCD and CEF, and one bar BE, connected by pins, carries a vertical load P = 6 kips at point F (Fig. 1.6a); it is supported by a pin at A and a cable DG. Dimensions are in inches. Find: (a) The components of the forces acting on joints B, C, and E. (b) The internal force and moment resultants acting on the cross section at point 0. Assumptions: Friction forces in the pin joints will be neglected. All forces are coplanar and two dimensional. Weights of the members are negligible compared to the applied load and can be ignored. SOLUTION: See Fig. 1.6 and Table 1.1. P= 6 kips 6 kips 75 Fo 50 30 50 Fo Fo 50 15 kips Mo Fo Cable B 75 4 kips 100 60° RA RAN (c) (b) (a)
Plane Trusses
It is defined as, two or more elements like beams or any two or more force members, which when assembled together, behaves like a complete structure or as a single structure. They generally consist of two force member which means any component structure where the force is applied only at two points. The point of contact of joints of truss are known as nodes. They are generally made up of triangular patterns. Nodes are the points where all the external forces and the reactionary forces due to them act and shows whether the force is tensile or compressive. There are various characteristics of trusses and are characterized as Simple truss, planar truss or the Space Frame truss.
Equilibrium Equations
If a body is said to be at rest or moving with a uniform velocity, the body is in equilibrium condition. This means that all the forces are balanced in the body. It can be understood with the help of Newton's first law of motion which states that the resultant force on a system is null, where the system remains to be at rest or moves at uniform motion. It is when the rate of the forward reaction is equal to the rate of the backward reaction.
Force Systems
When a body comes in interaction with other bodies, they exert various forces on each other. Any system is under the influence of some kind of force. For example, laptop kept on table exerts force on the table and table exerts equal force on it, hence the system is in balance or equilibrium. When two or more materials interact then more than one force act at a time, hence it is called as force systems.
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