Optimum Studies of Coefficient Variation of UBC Seismic Forces

by Franklin Y. Cheng, Univ of Missouri-Rolla, United States,
Chein-Chi Chang, Univ of Missouri-Rolla, United States,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


This paper presents an optimization algorithm for finding optimal parameters of a nondeterministic structure subjected to UBC seismic load for both normal and lognormal distribution models. The optimization algorithm is based on the first order approximation of reliability analysis; construction cost and expected failure cost; and a variety of constraints such as displacements of a system, yielding and buckling of constituent members. Several numerical examples are given which show that the optimum solutions are very sensitive to the high variation of UBC seismic load and high design reliability criteria; and the lognormal distribution demands higher optimum solution than the normal.

Subject Headings: Seismic tests | Seismic effects | Optimization models | Load distribution | Failure analysis | Construction costs | Earthquake resistant structures | Structural reliability

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