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Trusses method of joints

Trusses method of joints

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CIVL 3121 Trusses - Method of Joints Method of Joints 1/5 Method of Joints  If a truss is in equilibrium, then each of its joints must be in equilibrium.  Recall, that the line of action of a force acting on a joint is determined by the geometry of the truss member.  The method of joints consists of satisfying the equilibrium equations for forces acting on each joint.  The line of action is formed by connecting the two ends of each member with a straight line. F x 0 F y  Since direction of the force is known, the remaining unknown is the magnitude of the force. 0 Method of Joints Method of Joints Joint B Joint A Upper chord members Verticals Tension Force Joint B Joint A Diagonals Lower chord members Compression Force Method of Joints gusset plate Method of Joints Upper chord in compression weld Idealized joint – members connected by a frictionless pin Lower chord in tension This is a Pratt truss CIVL 3121 Trusses - Method of Joints 2/5 Method of Joints Method of Joints Upper chord in compression Procedure for analysis - the following is a procedure for analyzing a truss using the method of joints: 1. If possible, determine the support reactions 2. Draw the free body diagram for each joint. In general, assume all the force member reactions are tension (this is not a rule, however, it is helpful in keeping track of tension and compression members). Lower chord in tension This is a Howe truss Method of Joints ...
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