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IN STATICALLY DETERMINATE TRUSSES
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analysis analyzing application of unit applied loads artificially restrained axial deformation axial force bar forces basic end actions beam element beam structure bending-moment diagrams Betti's theorem components of joint components of support computed concentrated load conjugate beam corresponding defined with respect deflection curve developed distributed load disturbance element stiffness matrix end moments established evaluated Example Figure fixed-end actions flexibility matrix flexibility method free-body diagram ft-k horizontal identified in Fig independent components indeterminate structure indicated loading inertia internal actions joint displacement labels length line of action load applied load diagram modulus of elasticity original loading original structure planar point of application Prob Problem reference axes restrained structure rigid frame rotation segment shear force shown in Fig sign convention slope span static equilibrium statically determinate stiffness coefficients structural system support reactions translation truss unit value vertical deflection virtual action virtual load virtual strain energy zero