SMART2013, ENSI TEAM 1: CHALLENGES FACED DURING THE MODELLING AND DYNAMIC ANALYSIS WITH SAP2000 USING NONLINEAR LAYERED SHELL ELEMENTS

摘要

The international Benchmark Project SMART2013 has been organized by the CEA and the EDF under the hospice of the IAEA. It aims at understanding the nonlinear response of a typical reinforced concrete nuclear building subjected to high intensity seismic excitation and evaluating the modelling assumptions and analysis methods used to simulate the nonlinear behaviour. The project consists of four stages: development of the nonlinear Finite Element (FE) model; elastic calibration of the FE model using low intensity seismic test data (modal data and direct inputs/outputs in terms of accelerations and displacements); calculation of the expected nonlinear model's responses to high intensity seismic loadings using the updated FE model and the comparison with the measured values; probabilistic evaluations and vulnerability analysis. The computations described in this paper have been conducted by a team consisting of the Swiss Federal Nuclear Safety Inspectorate (ENSI) and the Basler & Hofmann Consulting Engineers (B&H) ("ENSI Team 1"). The focus of this paper is on the challenges faced during the modelling procedure in SAP2000 and on the lessons learned from the comparison between the measured and predicted structural responses. Parameter studies that have been conducted helped to identify ways to improve the FE model in order to increase the quality of the prediction of the structural responses. The vulnerability study has been conducted in terms of fragility curves for different seismic-and damage indicators. The modifications of the FE model based on engineering judgement significantly increased the model's ability to predict the response of the investigated reinforced concrete structure to high intensity seismic loadings.