RC框架结构直接基于位移的抗震优化设计方法
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摘要
探讨了静力弹塑性分析验证过程中遇到的几种情况及其产生原因,指出建筑结构设计方案在基于位移的抗震设计中的重要性。从框架结构的侧移模式出发,导出结构一定性能水平的目标顶点位移,建立结构目标顶点位移与等效位移的关系式,根据位移反应谱,由等效位移推出框架结构在各性能水平的目标周期。然后,由pushover曲线确定结构刚度退化机理,导出结构各性能水平相应的自振周期比例关系,根据结构各性能水平自振周期与目标周期的关系确定结构最优设计方案。通过例题加以验证,说明了此设计方法的可行性。
Some problems in pushover analysis are discussed.It illustrates that the structural scheme is very important in direct displacement-based seismic design.The roof's target displacement of RC frames is deduced by its lateral displacement mode.The relationship between the roof's target displacement and the equivalent displacement is determined.Based on displacement response spectra,the equivalent period for each performance could be deduced by equivalent displacement.Then,the degradation of structural stiffness is presented by pushover curve,and the relationship among natural periods of each performance is determined.According to the relationship between natural periods and corresponding equivalent period,the optimal structural scheme is chosen.The paper illustrates the application of the proposed method with an example and it proves that this method is feasible.
Some problems in pushover analysis are discussed.It illustrates that the structural scheme is very important in direct displacement-based seismic design.The roof's target displacement of RC frames is deduced by its lateral displacement mode.The relationship between the roof's target displacement and the equivalent displacement is determined.Based on displacement response spectra,the equivalent period for each performance could be deduced by equivalent displacement.Then,the degradation of structural stiffness is presented by pushover curve,and the relationship among natural periods of each performance is determined.According to the relationship between natural periods and corresponding equivalent period,the optimal structural scheme is chosen.The paper illustrates the application of the proposed method with an example and it proves that this method is feasible.
引文
[1]Browning J P,Proportioning of earthquake-resisting RC building structures[J].Journal of the Structural Division,ASCE,2001,127(2):145-151.
[2]GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[3]童岳生,钱国芳.砖填充墙钢筋混凝土框架的变形性能及承载力能力[J].西安冶金建筑学院学报,1985(2):1-10.
[4]SEAOC VISION2000 Committee.Performance-based seismic engineering[R].Sacramento,California,US,1995.
[5]郭子雄.基于变形的抗震设计理论及应用研究[D].上海:同济大学,2000.
[6]蔡健,周靖,方小舟.钢筋混凝土框架中震可修标准及简化抗震设计方法[J].地震工程与工程振动,2006,26(2):13-18.
[7]梁兴文,邓明科,李晓文,等.钢筋混凝土高层建筑结构基于位移的抗震设计方法研究[J].建筑结构,2006,36(7):15-22.
[8]梁兴文,黄雅捷,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-60.
[9]钱稼茹,罗文斌.静力弹塑性分析-基于性能/位移抗震设计的分析工具[J].建筑结构,2000,30(6):23-26.
[10]刘有军,周建民.基于位移的RC框架结构抗震设计研究[J].结构工程师,2003,(3):1-6.
[11]Miranda E,Garcia J G.Evaluation of approximate methods to estimate maximum inelastic displacement demands[J].Earthquake Engineering andStructural Dynamics,2002,31:539-560.
[12]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.
[13]杨溥,李英民,熊振勇,等.能力曲线折线简化方法对比研究[J].重庆建筑大学学报,2005,27(4):59-63.
[14]穆翠玲,王文俊,陈存恩.框剪结构抗震剪力墙数量的优化准则证明[J].世界地震工程,2003,19(1):154-157.
[2]GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[3]童岳生,钱国芳.砖填充墙钢筋混凝土框架的变形性能及承载力能力[J].西安冶金建筑学院学报,1985(2):1-10.
[4]SEAOC VISION2000 Committee.Performance-based seismic engineering[R].Sacramento,California,US,1995.
[5]郭子雄.基于变形的抗震设计理论及应用研究[D].上海:同济大学,2000.
[6]蔡健,周靖,方小舟.钢筋混凝土框架中震可修标准及简化抗震设计方法[J].地震工程与工程振动,2006,26(2):13-18.
[7]梁兴文,邓明科,李晓文,等.钢筋混凝土高层建筑结构基于位移的抗震设计方法研究[J].建筑结构,2006,36(7):15-22.
[8]梁兴文,黄雅捷,杨其伟.钢筋混凝土框架结构基于位移的抗震设计方法研究[J].土木工程学报,2005,38(9):53-60.
[9]钱稼茹,罗文斌.静力弹塑性分析-基于性能/位移抗震设计的分析工具[J].建筑结构,2000,30(6):23-26.
[10]刘有军,周建民.基于位移的RC框架结构抗震设计研究[J].结构工程师,2003,(3):1-6.
[11]Miranda E,Garcia J G.Evaluation of approximate methods to estimate maximum inelastic displacement demands[J].Earthquake Engineering andStructural Dynamics,2002,31:539-560.
[12]罗文斌,钱稼茹.钢筋混凝土框架基于位移的抗震设计[J].土木工程学报,2003,36(5):22-29.
[13]杨溥,李英民,熊振勇,等.能力曲线折线简化方法对比研究[J].重庆建筑大学学报,2005,27(4):59-63.
[14]穆翠玲,王文俊,陈存恩.框剪结构抗震剪力墙数量的优化准则证明[J].世界地震工程,2003,19(1):154-157.
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