Nonlinear inelastic analysis of space frames

Abstract

In this paper, a fiber beamcolumn element which considers both geometric and material nonlinearities is presented. The geometric nonlinearities are captured using stability functions obtained from the exact stability solution of a beamcolumn subjected to axial force and bending moments. The material nonlinearities are included by tracing the uniaxial stressstrain relationship of each fiber on the cross sections. The nonlinear equilibrium equations are solved using an incremental iterative scheme based on the generalized displacement control method. Using only one element per member in structure modeling, the nonlinear responses predicted by the proposed element compare well with those given ..