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ME85-lecture6 (1)

# ME85-lecture6 (1) - it is then in compression Summary 1...

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Lecture 6 Analysis of Structures (Truss) Objectives: Static Analysis of Truss Structures

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Pratt Truss
Howe Truss Structures

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Warren Truss Structures Baltimore Truss Bridge
Building a Model of a Truss Bridge Building a Model of a Truss Bridge

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Building a Model of a Truss Bridge Building a Model of a Truss Bridge ± The three-dimensional bridge structure has two main load-carrying trusses. Each truss is composed of a top chord, a bottom chord, and several verticals and diagonals. The two trusses are connected together by a series of transverse members—struts, lateral bracing, and floor beams.
Houston Reliant Astrodome

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Internal Force Sign Convention External force is a vector, and its direction is well defined; but Internal force is a different animal, and its direction depends on whether it is in tension or in compression. In standard engineering computations, we always assume that the internal force is in tension (away from the joint). If the final result is positive, it is indeed in tension; if the final result is negative

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Unformatted text preview: it is then in compression. Summary 1. Draw the free-body diagram of the entire structure and determine the reaction forces; 2. Start from an joint with only or less than two unknowns; 3. Draw free-body diagram of the joint and solve two equilibrium equations; 4. Repeat this procedure until forces in all members have been solved. 5. When the reaction of an internal force is (assumed) towards an joint, the internal force is (assumed) in compression; whereas the reaction of an internal force is (assumed) away from the joint, it is (assumed) in tension. Lecture 7 Method of Section and System Constraints Objectives: Static Analysis of Truss Structures Solution Insert an imaginary plane n-n to cut the structure into two parts, and analyze the left part: The system is completely constrained, and determinate, though the square GHIJ is not rigid....
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ME85-lecture6 (1) - it is then in compression Summary 1...

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