A Numerical Model for the Nonlinear Seismic Analysis of Three-Dimensional R.C. Frames

Abstract eng:
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 elastic-plastic solution is obtained adopting the Haar-Kàrmàn principle. A single-storey r.c. three-dimensional 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.

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