SEISMIC FRAGILITY AND COST ANALYSES OF ACTIVELY CONTROLLED STRUCTURES

Published

April 15, 2013

Author(s)

Kevin K. Wong, John L. Harris

Abstract

Seismic fragility represents the probability that the structural response exceeds a given performance limit state due to a specified intensity of ground motion, and it has a direct relationship with the cost of rehabilitating the structural system. In this research, a cost analysis framework based on seismic fragility to quantify the expected loss of the structural system is proposed. Incremental dynamic analysis is used to generate the fragility curves, and plastic strain derived from plastic energy dissipation is used to quantify the structural damage at local levels. Two moment-resisting steel frames and 100 non-stationary Gaussian earthquake ground motions are simulated, and correlations between local damage states and global performance limit states are performed to facilitate the cost analysis study. Results show that good correlations exist in seismic fragilities and therefore the repair cost of the structural system becomes quantifiable. Active control based on the optimal linear control algorithm is included in the study to identify the sensitivity of the correlations. It is observed that significant cost reduction can be achieved for low-rise structures when active control is used, but may not be cost effective if it is installed in taller structures.

Citation

The Structural Design of Tall and Special Buildings

Pub Type

Journals

Keywords

Force analogy method, Plastic energy, Drift ratio, Plastic strain, Cumulative strain ductility

Citation

Wong, K. and Harris, J. (2013), SEISMIC FRAGILITY AND COST ANALYSES OF ACTIVELY CONTROLLED STRUCTURES, The Structural Design of Tall and Special Buildings (Accessed April 19, 2024)