基于构件重要性指标的RC框架结构抗震优化设计研究
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摘要
通过引入基于结构广义刚度的构件重要性指标,提出了考虑构件重要程度差异的RC框架结构抗震优化设计方法。根据"构件重要性越大,承载力储备也越大"的结构系统设计策略,以构件的重要性程度由小到大逐渐发生损伤破坏的破坏模式为目标,根据现有一般构件的安全储备取值,建议了基于构件重要性指标的安全储备表达式。以广义结构刚度损失率作为结构失效判定依据,通过一RC框架结构抗震设计算例,分别对采用基于构件重要性指标方法和现行规范方法设计的结果进行对比,结果表明,建议方法的设计结果,其配筋分布更加合理,抗震性能得到显著改善,且总用钢量略有降低。
A member importance index based on the generalized structural stiffness was introduced to optimize the seismic design of RC frames.The formula used to determine the capacity margin of structural members was proposed according to the system design strategy that the more important member should have larger capacity margin.The design strategy was aiming to realize the member damage sequence from less important members to the important ones.Based on the current safety margin value for ordinary members,the safety margin was suggested for members with different important indices.The proposed seismic design method and the conventional method of the current design code were compared through a case study of a RC frame.The results show that the proposed method significantly improves the seismic performance and slightly reduce the amount of steel reinforcement.
A member importance index based on the generalized structural stiffness was introduced to optimize the seismic design of RC frames.The formula used to determine the capacity margin of structural members was proposed according to the system design strategy that the more important member should have larger capacity margin.The design strategy was aiming to realize the member damage sequence from less important members to the important ones.Based on the current safety margin value for ordinary members,the safety margin was suggested for members with different important indices.The proposed seismic design method and the conventional method of the current design code were compared through a case study of a RC frame.The results show that the proposed method significantly improves the seismic performance and slightly reduce the amount of steel reinforcement.
引文
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[2]叶列平.基于系统概念的建筑结构地震破坏机制和破坏过程的控制[J].工程抗震与加固改造,2009,31(5):1-7.(Ye Lieping.Failure mechanism and itscontrol of building structures under earthquakes basedon system concept[J].Earthquake ResistantEngineering and Retrofitting,2009,31(5):1-7.(inChinese))
[3]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2010.(GB50010—2010Code for design of concrete structures[S].Beijing:China Architecture&Building Press,2010.(inChinese))
[4]叶列平,林旭川,曲哲,等.基于广义结构刚度的构件重要性评价方法研究[J].建筑科学与工程学报,2010,27(1):1-6,20.(Ye Lieping,Lin Xuchuan,QuZhe,et al.Method of evaluating element importance ofstructure system based on the generalized structuralstiffness[J].Journal of Architectural and CivilEngineering,2010,27(1):1-6,20.(in Chinese))
[5]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.(GB50011—2010Codefor seismic design of buildings[S].Beijing:ChinaArchitecture&Building Press,2010.(in Chinese))
[6]宋世研,叶列平.中、美混凝土结构设计规范正截面受弯承载力的分析比较[J].建筑科学,2007,23(7):29-33,23.(Song Shiyan,Ye Lieping.A comparison ofdesign methods for flexural strength of RC beamsbetween Chinese and American design codes for RCstructures[J].Building Science,2007,23(7):29-33,23.(in Chinese))
[7]Applied Technology Council.Quantification of buildingseismic performance factors[R].Washington DC:Federal Emergency Management Agency,2009:6.7-6.8.
[8]汪训流,陆新征,叶列平.往复荷载下钢筋混凝土柱受力性能的数值模拟[J].工程力学,2007,24(12):76-81.(WANG Xun-liu,LU Xin-zheng,YE Lie-ping.Numerical simulation for the hysteresis behavior of RCcolumns under cyclic loads[J].EngineeringMechanics,2007,24(12):76-81.(in chinese))
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