DAI Hong-hui, ZHANG Yan-hong, YANG Chen

Earthquake Engineering Research Center, IWHR, Beijing 100048, China

Abstract: Dynamic time-history analysis method is an effective way to study the structural response under the action of the earthquake. The precision of the input ground motion time-history has a major impact on the calculation results. The actual ground motions are non- stationary both in amplitude and frequency content, but currently the artificial wave used for dynamic time-history analysis is stationary ground motion in frequency content. In this paper, an improved earthquake model as the product of a constant intensity process having time-varying frequency content and a deterministic intensity function is proposed. The new model is achieved by adding frequency adjustment to the traditional triangular series model. The fully nonstationary ground motion generated by the new model is not only closer to the real earthquake records but also can fit the target response spectrum better, so it will be of great significance for the engineering practice.

Key words: earthquake ground motions, time-frequency non-stationary, frequency adjustment, response Spectrum

Published in: Journal of China Institute of Water Resources and Hydropower Research (Vol. 11 No. 1, 2013)