Seismic fragility curves for framed buildings with flat beams

Abstract

Procedures and techniques for the study of the seismic behaviour of buildings base on existing computer programs are developed in this paper. SAP2000 non-linear computer program was used to design the building. STAC computer program was applied to consider the uncertainties in the mechanical properties of the materials and to perform Monte Carlo simulations; this program enables generating data samples for geometrical and the material properties of a structure considered as random variables. RUAUMOKO computer program was employed to assess the seismic behaviour of the structure by means of a non-linear static analysis, calculating its capacity spectra. BCSEC computer program calculates the interaction and the moment-curvature diagrams for each cross section of the
structural elements required as an input data by RUAUMOKO program.

A stochastic analysis of the capacity and seismic response was carried out and fragility curves were then obtained for a five stories framed building using a lognormal cumulative function, indicating the probability of reaching or exceeding a certain damage state, for a given seismic demand. The main application of these curves is found in the simulation of vulnerability and seismic risk scenarios for urban areas.