Use of near-fault pulse-energy for estimating critical structural responses

Zhiwang Chang , Zhanhui Liu , Zhenhua Chen , Changhai Zhai

Abstract

Near-fault ground motions can impose particularly high seismic demands on structures due to the pulses that are typically observed in the velocity time-histories. In this study it is empirically found that the critical response can be estimated from the directions corresponding to the maximum (max) or minimum (min) pulse-energy. Determination of the pulse-energy requires removing of the high-frequency content. For achieving this, the wavelet analysis and the least-square-fitting (LSF) algorithm are adopted. Results obtained by the two strategies are compared and differences between them are analyzed. Finally, the relationship between the critical response and the response derived from directions having the max or min pulse-energy confirms that using the pulse-energy for deriving the critical response of the building structures is reasonable.

Key Words

near-fault; pulse-like; ground motions; pulse-energy; critical response

Address

Zhiwang Chang, Zhanhui Liu, Zhenhua Chen — School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P.R. China
Changhai Zhai — School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P.R. China

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