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The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions

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Abstract

This manuscript investigates the strength reduction factor of single degree of freedom system with constant ductility performance subjected to the mainshock–aftershock sequence-type ground motions. The recorded and artificial sequence-type ground motions are used. The aftershock ground motions in sequence are scaled to have different relative intensity levels. Four hysteretic models are used to simulate the different type of structures. The effects of period, ductility factor, site condition, aftershock, hysteretic behavior and damping are studied statistically. The results indicate that the strong aftershock ground motion has more obvious influences on strength reduction factors in short period region than on those in long period region. The degrading behavior would decrease the strength reduction factor of structure with short period at a magnitude of <20 %, while it would increase that of structure with medium-long period at a maximum level of 20 %. Finally, a predictive model, incorporating the effect of aftershock, is proposed to determine the strength reduction factor in the seismic design.

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Acknowledgments

This investigation is supported by the National Natural Science Foundation of China (Nos. 51322801,51238012 and 91215301), the Program for International Science and Technology Cooperation Projects of China (No. 2012DFA70810), the Program for New Century Excellent Talents in University of Ministry of Education of China (No. NCET-11-08), as well as the National Science and Technology Major Project (2013zx06002001-09). These supports are greatly appreciated. The authors are grateful to the anonymous reviewers for their constructive comments and suggestions.

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Authors and Affiliations

  1. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, China

    Chang-Hai Zhai, Wei-Ping Wen, Shuang Li & Li-Li Xie

  2. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin, 150090, China

    Chang-Hai Zhai, Wei-Ping Wen & Shuang Li

  3. Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China

    Li-Li Xie

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  1. Chang-Hai Zhai
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Correspondence to Chang-Hai Zhai.

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Zhai, CH., Wen, WP., Li, S. et al. The ductility-based strength reduction factor for the mainshock–aftershock sequence-type ground motions. Bull Earthquake Eng 13, 2893–2914 (2015). https://doi.org/10.1007/s10518-015-9744-z

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