297Chap6

297Chap6 - Analysis of structures Structures are made of...

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Analysis of structures Structures are made of several interconnected parts. The total structure and anypart of the structure is in equilibrium. Determine reactions Determine internal forces From Newton’sthird law, the internal forces between twoparts have the same magnitude, same line of action, and opposite sense.
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CE 297 2 Plane trusses The truss is structure type commonly used in buildings and bridges. Members are straight and connected at joints. Loads act in the plane of the truss (2-dimensional structure) and are applied at the joints. Members are slender and can support little lateral load. Members are assumed to be pinned together. Members are two-force members in tension or compression.
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CE 297 3 Simple trusses Rigid truss Atruss that will not collapse. Simple truss At russ constructed from a basic triangle truss by repeatedly adding a newjoint and twonew members. joints(j) members(m) 33 45 57 ... ... m = 2 j - 3
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CE 297 4 Method of joints Method of joints Each member is either in tension or compression. The lines of action of the member forces are known. Each joint is in equilibrium. Forasimple truss with j joints, There are a total of 2 j equilibrium equations.
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297Chap6 - Analysis of structures Structures are made of...

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