BRB消能减震结构设计中附加有效阻尼比计算方法分析研究
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摘要
依据《建筑抗震设计规范》(GB 50011—2010)提出的消能减震结构设计中附加有效阻尼比的确定方法,结合实际BRB消能减震结构,采用包络法、时变法及综合法三种取值方法,分别计算BRB的附加有效阻尼比,将计算所得附加有效阻尼比叠加回原结构,对叠加后结构进行弹塑性时程分析,对比其与BRB消能减震结构的响应。结果表明:包络法计算简捷、精度略低,计算结果较安全保守;时变法计算繁复、精度较高,较符合实际;综合法计算繁复程度和精度均介于包络法和时变法之间,此研究可为BRB消能减震结构计算附加有效阻尼比提供参考,亦可作为其他位移及速度型消能减震结构计算附加有效阻尼比的参考。
According to the determination method of additional effective damping ratio during the design of BRB energy dissipation structure in Code for seismic design of buildings( GB 50011—2010),combined with the actual BRB energy dissipation structure,the additional effective damping ratio of BRB was calculated by three methods,including envelope method,time variation method and comprehensive method.The additional effective damping ratio was added back to the original structure,and the elastoplastic time history analysis of the superimposed structure was carried out.The response of the structure was compared with that of the BRB energy dissipation structure.The results show that the calculation of envelope method is simple,but less accurate,and the calculation result is safer and conservative.The calculation of time variation method is complex and accurate,and more in line with reality.The complexity and precision of comprehensive method is between envelope method and time variation method.This study can provide a reference for selecting calculation method of additional effective damping ratio in the design of BRB structure,and also can be used for calculating the additional effective damping ratio of other displacement and velocity energy dissipation structures.
According to the determination method of additional effective damping ratio during the design of BRB energy dissipation structure in Code for seismic design of buildings( GB 50011—2010),combined with the actual BRB energy dissipation structure,the additional effective damping ratio of BRB was calculated by three methods,including envelope method,time variation method and comprehensive method.The additional effective damping ratio was added back to the original structure,and the elastoplastic time history analysis of the superimposed structure was carried out.The response of the structure was compared with that of the BRB energy dissipation structure.The results show that the calculation of envelope method is simple,but less accurate,and the calculation result is safer and conservative.The calculation of time variation method is complex and accurate,and more in line with reality.The complexity and precision of comprehensive method is between envelope method and time variation method.This study can provide a reference for selecting calculation method of additional effective damping ratio in the design of BRB structure,and also can be used for calculating the additional effective damping ratio of other displacement and velocity energy dissipation structures.
引文
[1]建筑抗震设计规范:GB 50011—2010[S].北京:中国建筑工业出版社,2010.
[2]NEHPR commentary on the guidelines for the seismic rehabilitation of building:FEMA 273[S].Washington D.C.:FEMA,1997.
[3]刘文锋,李建峰.消能减震结构设计的阻尼比研究[J].世界地震工程,2005,21(2):80-84.
[4]李钢,李宏男,李云贵.考虑平-扭耦联效应的消能减震结构振动反应分析[J].建筑结构学报,2009,30(6):86-93.
[5]高向宇,李永梅,张慧,等.考虑防屈曲支撑力学参数非对称性的有效阻尼比[J].建筑结构,2008,38(3):96-100.
[6]周云.防屈曲耗能支撑结构设计与应用[M].北京:中国建筑工业出版社,2007.
[7]高层民用建筑钢结构技术规程:JGJ 99—98[S].北京:中国建筑工业出版社,1998.
[8]胡宝琳,姚文娟,李国强.罕遇地震荷载作用下屈曲约束支撑框架结构弹塑性位移的简化计算方法[J].振动与冲击,2011,30(2):144-148.
[2]NEHPR commentary on the guidelines for the seismic rehabilitation of building:FEMA 273[S].Washington D.C.:FEMA,1997.
[3]刘文锋,李建峰.消能减震结构设计的阻尼比研究[J].世界地震工程,2005,21(2):80-84.
[4]李钢,李宏男,李云贵.考虑平-扭耦联效应的消能减震结构振动反应分析[J].建筑结构学报,2009,30(6):86-93.
[5]高向宇,李永梅,张慧,等.考虑防屈曲支撑力学参数非对称性的有效阻尼比[J].建筑结构,2008,38(3):96-100.
[6]周云.防屈曲耗能支撑结构设计与应用[M].北京:中国建筑工业出版社,2007.
[7]高层民用建筑钢结构技术规程:JGJ 99—98[S].北京:中国建筑工业出版社,1998.
[8]胡宝琳,姚文娟,李国强.罕遇地震荷载作用下屈曲约束支撑框架结构弹塑性位移的简化计算方法[J].振动与冲击,2011,30(2):144-148.