Author(s)

M. A. Jaimes Téllez, E. Reinoso Angulo & M. Ordaz Schroeder

Abstract

A method of disaggregation probabilistic seismic hazard assessment is applied to determine the most probable magnitude, M, and distance, R, of certain seismic events that can generate a fixed seismic intensity (spectral ordinate) associated to an exceedance rate for hard soil in Mexico City. The main seismic sources which affect the firm land structures are determined. In addition, the following criteria are used: i) to establish in which structural periods the spectral ordinates should be used so that the response of the expected motion does not exceed the uniform hazard spectra and ii) to find the minimum number of design strong ground motions that must be considered to include spectral ordinates of uniform hazard spectra. Keywords: subduction, intermediate depth, Mexico City, simulation, strong ground motion, design accelerograms. 1 Introduction In some cases, especially when it is necessary to evaluate the response in the inelastic range of important structures, it is not enough to define the seismic motions by means of a design spectrum. This considers forces related to parameters of maximum response like the spectral acceleration that does not always have a direct correlation with the loss and damage, besides not including the accumulated damage or degradation produced by the hysteretic behavior due to severe seismic events during the useful life of the structure. That is why accelerograms are used in the design of important structures, for example, to evaluate complex structures as such dams, bridges, tall buildings with irregular plant or elevation; structures where higher modes of vibration could be important or structures designed to have high demands of ductility. These accelerograms

Keywords

subduction, intermediate depth, Mexico City, simulation, strong ground motion, design accelerograms.