A NUMERICAL MODEL FOR THE NONLINEAR SEISMIC ANALYSIS OF THREE-DIMENSIONAL R.C. FRAMES
A lumped plasticity model for the nonlinear dynamic analysis of three-dimensional reinforced concrete (r.c.) frames subjected to bi-directional ground motion is proposed. The frame members are idealized by means of two parallel elements, one elastic-perfectly plastic and the other linearly elastic, assuming a bilinear momentcurvature law. An interaction surface axial force-biaxial bending moment is considered for the end sections of each frame member. The nonlinear dynamic analysis is performed using a step-by-step procedure based on a two-parameter implicit integration scheme and an initial-stress like iterative procedure. At each step, the frame subjected to a bi-directional artificial ground motion, whose response spectrum matches on average that adopted by Eurocode 8 for a medium risk seismic region and a medium soil, is assumed as test structure for the numerical investigation. The sensitivity of the model to changes in input parameters is investigated. Moreover, a refined fibre model is considered to validate the proposed numerical model.
Three-dimensional structure nonlinear seismic analysis bi-directional motion axial force-biaxial flexure interaction lumped plasticity model
F. Mazza M. Mazza
Dept. of Engineering Modeling, University of Calabria, 87036, Rende Cosenza, Italy
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）