外套加层结构中的隔震支座优化参数研究
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摘要
对隔震技术在分离式外套框架加层结构中的应用进行了研究,研究结果表明可通过理论表达式得到初步设计时隔震支座的优化参数。采用线性弹簧和线性阻尼器并联的模型模拟橡胶支座,并采用Bouc-Wen模型描述结构的滞回特性。在数值算例中,对不同加速度峰值和不同地震波激励下的外套框架加层结构进行了非线性动力分析,得到了隔震支座的优化刚度和阻尼系数,该结果与理论表达式得到的优化阻尼系数一致,大量的数值分析结果表明在一定范围内,隔震支座的刚度取值对其耗能减震效果影响不大,说明隔震技术在分离式外套框架加层结构中的应用具有较大的优势,隔震支座阻尼系数初步设计值可通过理论表达式求得,可为工程师的初步设计提供参考,有利于这种加层结构体系的推广应用。
The application of seismic isolation technology in separated structure with exte rnal frame and added floors is studied.The results showed that the optimal para meter of isolator can be achieved through theory expressions.The seismic isolat or is modeled as a spring and a viscous dashpot which are combined in parallel. The structural nonlinearity is characterized by Bouc-Wen model.In the numerical example,the nonlinear dynamic response of structure with external and added fl oors is analyzed,while the structure subjected to different earthquake records with different peak ground acceleration(PGA).The optimal parameters of isolato r are selected in the results which obtained through extensive parametric studie s.It can be found that the optimal damping coefficient of isolator is consisten t with the theory results.The extensive numerical results also show that the in itial stiffness of bilinear isolator has little influence on the seismic energy dissipation performance,which demonstrates that seismic isolation technology in structure with external and added floors.The theory formula can help engineers in preliminary designing.These advantages benefit to the application of this s tructure system with added floors.
The application of seismic isolation technology in separated structure with exte rnal frame and added floors is studied.The results showed that the optimal para meter of isolator can be achieved through theory expressions.The seismic isolat or is modeled as a spring and a viscous dashpot which are combined in parallel. The structural nonlinearity is characterized by Bouc-Wen model.In the numerical example,the nonlinear dynamic response of structure with external and added fl oors is analyzed,while the structure subjected to different earthquake records with different peak ground acceleration(PGA).The optimal parameters of isolato r are selected in the results which obtained through extensive parametric studie s.It can be found that the optimal damping coefficient of isolator is consisten t with the theory results.The extensive numerical results also show that the in itial stiffness of bilinear isolator has little influence on the seismic energy dissipation performance,which demonstrates that seismic isolation technology in structure with external and added floors.The theory formula can help engineers in preliminary designing.These advantages benefit to the application of this s tructure system with added floors.
引文
[1]高剑平.砖砌体房屋外套结构加层改造技术[M].成都:西南交通大学出版社,2010.
[2]Li H N,Wanga S Y,Song G B,et al.Reduction of seismic forces on existing buildings with newly con-structed additional studies including friction layer and dampers[J].Journal of Sound and Vibration,2004,269(3-5):653-667.
[3]李宏男,殷永炜,林立岩.采用摩擦和消能装置的加层结构振动台试验研究[J].建筑结构学报,2001,22(4):67-71.
[4]周福霖,张颖,谭平.层间隔震体系的理论研究[J].土木工程学报,2009,42(8):1-8.
[5]祁皑,林云腾,郑国琛.层间隔震结构工作机理研究[J].地震工程与工程振动,2006,26(4):239-243.
[6]Yasuhiro Tsuneki,Shingo Torii,Katsuhide Murakami,et al.Middle-story isolated structural system of high-rise building[J].Journal of Disaster Research,2009,4(3):229-238.
[7]Zhu Hongping,Ge Dongdong,Huang Xiao.Optimum connecting dampers to reduce the seismic responses of parallel structures[J].Journal of Sound and Vibra-tion,2011,330(9):1931-1949.
[8]Wen Y K.Method for random vibration of hysteretic systems[J].Journal of the Engineering Mechanics Di-vision,1976,102(EM2):249-263.
[9]Providakis C P.Effect of LRB isolators and supple-mental viscous dampers on seismic isolated buildings under near-fault excitations[J].Engineering Struc-tures,2008,30(5):1187-1198.
[10]Hwang Jenn-Shin,Tseng Yi-Shane.Design formula-tions for supplemental viscous dampers to highway bridges[J].Earthquake Engineering and Structure Dynamics,2005,34(13):1627-1642.
[2]Li H N,Wanga S Y,Song G B,et al.Reduction of seismic forces on existing buildings with newly con-structed additional studies including friction layer and dampers[J].Journal of Sound and Vibration,2004,269(3-5):653-667.
[3]李宏男,殷永炜,林立岩.采用摩擦和消能装置的加层结构振动台试验研究[J].建筑结构学报,2001,22(4):67-71.
[4]周福霖,张颖,谭平.层间隔震体系的理论研究[J].土木工程学报,2009,42(8):1-8.
[5]祁皑,林云腾,郑国琛.层间隔震结构工作机理研究[J].地震工程与工程振动,2006,26(4):239-243.
[6]Yasuhiro Tsuneki,Shingo Torii,Katsuhide Murakami,et al.Middle-story isolated structural system of high-rise building[J].Journal of Disaster Research,2009,4(3):229-238.
[7]Zhu Hongping,Ge Dongdong,Huang Xiao.Optimum connecting dampers to reduce the seismic responses of parallel structures[J].Journal of Sound and Vibra-tion,2011,330(9):1931-1949.
[8]Wen Y K.Method for random vibration of hysteretic systems[J].Journal of the Engineering Mechanics Di-vision,1976,102(EM2):249-263.
[9]Providakis C P.Effect of LRB isolators and supple-mental viscous dampers on seismic isolated buildings under near-fault excitations[J].Engineering Struc-tures,2008,30(5):1187-1198.
[10]Hwang Jenn-Shin,Tseng Yi-Shane.Design formula-tions for supplemental viscous dampers to highway bridges[J].Earthquake Engineering and Structure Dynamics,2005,34(13):1627-1642.
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