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| Analysis on robustness of RC frame structure subject to near-field ground motions |
| Du Yongfeng1,2, Song Xiang1, Bao Chao1, Zhu Xiang1, Tan Zhihong1 |
1. Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050;
2.Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050 |
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Abstract Based on the mechanics characteristics of structure subjected to seismic action, an improved calculation method for coefficients of vulnerability and importance of constructional element was proposed in order to analyze the structural robustness under near-field earthquake. Two groups of ground motions, with or without velocity pulses, were applied to reinforced concrete frame structure and the coefficients of vulnerability, importance and robustness of element were also compared under different seismic intensities, which aimed to reveal the characteristics of structural robustness representing the ability of resisting progressive collapse and propose relative measures to enhance the structural robustness. The results show that the robustness can reflect the state of structure subjected to seismic action better than other response indexes such as the story-drift angel. The seismic action with velocity pulses has more evident impacts on the vulnerability and importance of structure than that without velocity pulses and can reduce the structural robustness, causing a more adverse effect on the structural safety.
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Received: 12 November 2014
Published: 25 January 2016
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