Abstract
The Tall Building Push-Over Analysis program (TBPOA) puts forward precise, concise and practical ways of 3D push-over analysis and static elasto-plastic analysis for reinforced concrete tall buildings. Column and beam elements of TBPOA are modeled by nonlinear bar units, while wall elements by nonlinear bar units considering shearing deformation. Based on the plane cross-section assumption, surface integral of the bar unit is substituted with curvilinear integral along the edge. Besides, a quadratic term is introduced into geometric equation in order to have tall building’s P-Δ effect precisely measured. Wall element model is acquired by adding nonlinear shear spring into bar element, which make it possible to calculate axial, bending and shearing deformation at one time in the program. Newton-Raphson iteration method and arc-length method are introduced to solve the nonlinear equations towards the softening phase of concrete.
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