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acting allowable unit stresses applied assumed axial load bars bending bending-moment diagram bolt bridges centroid chord column compression members compressive stress computed concentrated loads couple cross section dead load deflection determined diameter dimension distance elastic equal Equation equilibrium polygon fixed flange floor force polygon force system formula ft-kips ft-lb given Grade graphically hinged horizontal inertia influence diagram influence line intersect joint loads kips lb per sq length line of action live load located lumber magnitude material maximum bending-moment neutral axis plane positive shear pounds per square pressure produce purlins ratio reaction reinforced concrete resistance resultant rivet roof surface roof truss safe shear and bending-moment shear stress shown in Fig simply supported slab spacing span Specifications 1944 static statically indeterminate stiffeners strength of materials structure tensile stress tension thickness timber tion uniform load weight weld width wind yield stress