地震动特性对HDRB基础隔震剪力墙结构地震易损性的影响
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摘要
研究了近场含脉冲地震动(NFWP地震动),近场不含脉冲地震动(NFWNP地震动)和远场地震动(FF地震动)对HDRB基础隔震剪力墙结构(HBRSW结构)地震易损性的影响。首先利用增量动力分析方法研究了HBRSW结构的概率地震需求模型(PSDM);在此基础上,分别绘制了HDRB隔震支座、RC剪力墙及HBRSW结构的易损性曲线;最后,利用抗倒塌储备系数评价了HBRSW结构的抗倒塌性能。研究表明,与峰值加速度PGA相比,谱加速度Sa与HBRSW结构性能参数的相关性较高;在同等强度地震动作用下,FF地震动引起的HBRSW结构损伤概率较大,NFWP引起的结构损伤概率次之,NFWNP地震动引起的结构的损伤概率最小; FF地震动作用下HBRSW结构的抗倒性塌能略差于NFWNP和NFWP地震动作用下HBRSW结构的抗倒塌性能。
This paper presents the seismic vulnerability assessment of a high-damping-rubber-bearing( HDRB) base-isolated RC shear wall structure( HBRSW structure) subjected to near-field with pulse( NFWP) ground motions,near-field with no pulse( NFWNP)ground motions and far-field( FF) ground motions. Probabilistic seismic demand models( PSDMs) of the HBRSW structure under NFWP ground motions,NFWNP ground motions and FF ground motions are generated based on scaling approach first. Then fragility curves for HDRB,RC shear wall and the HBRSW structure are developed. Finally,collapse margin ratio was used to evaluate the collapse-resistant performance of the HBRSW structure. The result shows that,compared with peak ground acceleration PGA,the correlation between spectrum acceleration Saand structural performance parameters of the HBRSW structure is higher. The seismic vulnerability of the HBRSW structure under FF ground motions is larger than that under NFWP ground motions and NFWNP ground motions,the collapse-resistant performance of the HBRSW structure under FF ground motions is less than that under NFWP ground motions and NFWNP ground motions.
This paper presents the seismic vulnerability assessment of a high-damping-rubber-bearing( HDRB) base-isolated RC shear wall structure( HBRSW structure) subjected to near-field with pulse( NFWP) ground motions,near-field with no pulse( NFWNP)ground motions and far-field( FF) ground motions. Probabilistic seismic demand models( PSDMs) of the HBRSW structure under NFWP ground motions,NFWNP ground motions and FF ground motions are generated based on scaling approach first. Then fragility curves for HDRB,RC shear wall and the HBRSW structure are developed. Finally,collapse margin ratio was used to evaluate the collapse-resistant performance of the HBRSW structure. The result shows that,compared with peak ground acceleration PGA,the correlation between spectrum acceleration Saand structural performance parameters of the HBRSW structure is higher. The seismic vulnerability of the HBRSW structure under FF ground motions is larger than that under NFWP ground motions and NFWNP ground motions,the collapse-resistant performance of the HBRSW structure under FF ground motions is less than that under NFWP ground motions and NFWNP ground motions.
引文
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[2] Zhang J,Huo Y. Evaluating effectiveness and optimum design of isolation devices for highway bridges using the fragility function method[J]. Engineering Structures,2009,31(8):1648-1660
[3] Chopra A K,Chintanapakdee C. Comparing response of SDF systems to near-fault and far-fault earthquake motions in the context of spectral regions[J].Earthquake Engineering&Structural Dynamics,2001,30(1):1769-1789
[4] Ellingwood B R, Celik O C, Kinali K. Fragility assessment of building structural systems in Mid America[J]. Earthquake Engineering&Structural Dynamics,2007,36(13):1935-1952
[5] Song J,Ellingwood B R. Seismic reliability of special moment steel frames with welded connections:II[J].Journal of Structure Engineering-ASCE,1999,125(1):372-384
[6] Hwang H,Jernigan J B,Lin Y W. Evaluation of seismic damage to Memphis bridges and highway systems[J].Journal of Bridge Engineering-ASCE,2000,5(1):322-30
[7]陆新征,叶列平.基于IDA分析的结构抗地震倒塌能力研究[J].工程抗震与加固改造,2010,32(1):13-18Lu Xin-zheng, Ye Lie-ping. Study on the seismic collapse resistance of structural system[J]. Earthquake Resistant Engineering and Retrofitting,2010,32(1):13-18(in Chinese)
[8]周颖,吕西林,卜一.增量动力分析法在高层混合结构性能评估中的应用[J].同济大学学报(自然科学版),2010,38(2):183-187Zhou Ying,Lv Xi-lin,Bo Yi. Application of incremental dynamic analysis to seismic evaluation of hybrid structure[J]. Journal of Tongji University(Natural Science),2010,38(2):183-187(in Chinese)
[9]马千里,叶列平,陆新征,等.采用逐步增量弹塑性时程方法对RC框架结构推覆分析侧力模式的研究[J].建筑结构学报,2008,29(2):132-140Ma Qian-li,Ye Lie-ping,Lu Xin-zheng,et al. Study on lateral load patterns of pushover analysis using incremental dynamical analysis for RC frame structures[J]. Journal of Building Structure,2008,29(2):132-140(in Chinese)