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Reactions and Stresses 137
Graphic Statics 3866
Roof Trusses 6778
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acting angle applied arch assumed axis bar stresses bending bottom chord bridge cause change in length column compression computed concentrated load coplanar dead load deflection curve diagonal direct stresses Draw elastic weights end moments equation equilibrium polygon Example floor beams force polygon force system free body funicular girder given gives hinge indeterminate influence line intersection joint kip-ft kips lb per ft lb per sq line of action live load load shown lower chord magnitude method method of moments moments of inertia movement Note obtained ordinate panel load panel point parallel plane points of contraflexure positive Pratt truss Problem reaction components redundant resultant roof rotation secondary stresses shear shown in Fig Slope Deflection solution span statically determinate strength of materials stress in bar stringers structure tension top chord triangle truss shown uniform load unit load unknown vertical component Warren truss wheel