既有结构增设早屈型抗侧力分支体系的性能分析
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摘要
为准确预测增设抗侧力分支体系的既有结构在真实地震下的动力响应,实现基于性能的抗震设计方法,有必要研究分支体系强度不足而过早屈服对结构地震响应的影响。本文采用等效简化的研究方法,对增设分支体系的既有结构进行了特定烈度地震动力时程分析,研究了分支体系早屈对结构地震响应的影响。结果表明:分支体系早屈的前提下,长周期范围内结构的最大相对位移和原结构承担的地震作用幅值,随分支体系屈服强度系数的降低呈递减趋势。在短周期范围内,结构的最大相对位移和原结构承担的地震作用幅值随分支体系屈服强度系数的降低呈递增趋势。
The accurate prediction of the real dynamic response under earthquake of the existing structures with additional branch system of side force resistant is necessary for the performance-based seismic design method of structures.The affect of insufficient strength of the branch system on structural earthquake response is studied.Research methods of simplified equivalent are used based on time-history analysis under specific intensity to study the infulence of early yielding of the branch system on structural earthquake response.The results show that,with long periods,maximum relative displacement of structure and maximum earthquake undertaked by the original structure will be reduced by decreasing branch system yield strength coefficient after branch system yielded.Reversely,with short periods,maximum relative displacement of structure and maximum earthquake undertaked by the original structure will be increased by decreasing branch system yield strength coefficient.
The accurate prediction of the real dynamic response under earthquake of the existing structures with additional branch system of side force resistant is necessary for the performance-based seismic design method of structures.The affect of insufficient strength of the branch system on structural earthquake response is studied.Research methods of simplified equivalent are used based on time-history analysis under specific intensity to study the infulence of early yielding of the branch system on structural earthquake response.The results show that,with long periods,maximum relative displacement of structure and maximum earthquake undertaked by the original structure will be reduced by decreasing branch system yield strength coefficient after branch system yielded.Reversely,with short periods,maximum relative displacement of structure and maximum earthquake undertaked by the original structure will be increased by decreasing branch system yield strength coefficient.
引文
[1]国务院抗震救灾总指挥部.汶川地震灾后恢复重建条例[R].北京:国务院抗震救灾总指挥部,2008.State Council Earthquake Relief Headquarters.Wenchuan Earthquake Restoration and ReconstructionOrdinance[R].Beijing:State Council Earthquake ReliefHeadquarters,2008(in Chinese)
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[2]王亚勇.概论汶川地震后我国建筑抗震设计标准的修订[J].土木工程学报,2009,5(5):1～12Wang Ya-yong.An Overview of Recent Revision ofSeismic Design Codes after the 5.12 WenchuanEarthquake[J].China Civil Engineering Journal,2009,5(5):1～12(in Chinese)
[3]程光煜,叶列平.弹塑性SDOF系统的地震输入能量谱[J].工程力学,2008,2(2):28～39Cheng Guang-yu,Ye Lie-ping.Earthquake Input EnergySprctrum for Inelastic SDOF Systems[J].EngineeringMechanics,2008,2(2):28～39(in Chinese)
[4]Nielsen N N,Inbeault F A.Validity of Various HystereicSystems[A].Proceedings of the 3rd japan NationalConference on Earthquakes Engineering[C].Tokyo:Yokohama,1971:707～714
[5]童根树,黄金桥.不同滞回模型下单自由度系统的位移和能量反应[J].浙江大学学报(工学版),2005,10(1):123～130Tong Gen-shu,Huang Jin-qiao.Displacement and EnergyResponse of Single Degree Freedom System with DifferentHysteretic Models[J].Journal of Zhejiang University(Engineering Science),2005,10(1):123～130(inChinese)
[6]叶列平,陆新征,马千里,程光煜,宋世研,缪志伟,潘鹏.屈服后刚度对建筑结构地震响应影响的研究[J].建筑结构学报,2009,4(2):17～29Ye Lie-ping,Lu Xin-zheng,Ma Qian-li,Cheng Guang-yu,et al.Influence of Post-yielding Stiffness to SeismicResponse of Building Structures[J].Journal of BuildingStructure,2009,4(2):17～29(in Chinese)
[7]张绍武,高科峰,方波.框架结构增设剪切型抗侧力单元的抗震加固研究[J].工程抗震与加固改造,2010,32(1):100～103Zhang Shao-wu,Gao Ke-feng,Fang Bo.Anti-seismicReinforcement Research on the Additional Frame-ShearSide of the Power Unit[J].Earthquake ResistantEngineering and Retrofitting,2010,32(1):100～103(inChinese)
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