| Seismic force modification factor for ductile structures |
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| 作者姓名： | 童根树 黄金桥 |
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| 作者单位： | Department of Structural Engineering，Zhejiang University，Department of Structural Engineering，Zhejiang University Hangzhou 310027，China，Hangzhou 310027，China China United Engineering Corporation，Hangzhou 310027，China |
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| 摘 要： | INTRODUCTION In codes for seismic design of buildings of many developed countries, elastic response spectra are adopted to calculate the base shear forces. For exam-ple, the base shear defined in Japan code 1997 is: FEK=DsFesC0ZAiRtW (1) where Rt is the elastic design spectrum; Ds is the structural coefficient changing among 0.25 to 0.50 to take account of different ductility of different struc-tures; W is the total weight of a structure; the others are site coefficient, irregular…
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| 关 键 词： | 地震能量 建筑物 延展结构 弹塑性力学 SDOF系统 |
| 收稿时间： | 2004-07-14 |
| 修稿时间： | 2004-10-25 |
Seismic force modification factor for ductile structures |
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| Tong Gen-shu,Huang Jin-qiao.Seismic force modification factor for ductile structures[J].Journal of Zhejiang University Science,2005,6(8):813-825. |
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| Authors: | Tong Gen-shu Huang Jin-qiao |
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| Institution: | 1.Department of Structural Engineering,Zhejiang University,Hangzhou,China |
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| Abstract: | The earthquake forces used in design codes of buildings should be theoretically determinable. This work examines the seismic force modification factor R based on elastic-plastic time-history earthquake analysis of SDOF systems, wherein the hysteresis models are elastic-perfectly-plastic (EPP), elastic-linearly-hardening (ELH), shear-slipped and bilinear-elastic. The latter two models are analysed for separating the effect of the ductility and the energy-dissipating capacity. Three-hundred eighty-eight earthquake records from different site conditions are used in analysis. The ductility is taken to be 2, 3, 4, 5 and 6, with the damping ratio being 0.02, 0.035 and 0.05 respectively. The post-yield stiffness ratios 0.0, 0.1 and 0.2 are used in the analysis. The R spectra are standardized by the characteristic period of the earthquake records, which leads to a much smaller scatter in averaged numerical results. It was found that the most important factor determining R is the ductility. R increases more than linearly with ductility. The energy-dissipating capacity, damping and the post-yield stiffness are the less important factors. The energy dissipating capacity is important only for structures with short period and moderate period (0.3≤T/Tg＜5.0). For EPP and ELH models, R for 0.05 damping is 10% to 15% smaller than for 0.02 damping. For EPP and ELH models, greater post-yield stiffness leads to greater R, but the influence of post-yield stiffness is obvious only when the post-yield stiffness is less than 10% of the initial stiffness. By means of statistical regression analysis the relation of the seismic force modification factor R with the natural period of the system and ductility for EPP and ELH models were established for each site and soil condition. |
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| Keywords: | Aseismic design Seismic force modification coefficient Ductility Energy-dissipating capacity |
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