超高层建筑地震动强度指标探讨
|
摘要
地震动强度指标是建筑结构抗震设计的重要依据。该文以弯-剪耦合梁模型为基础,建立超高层建筑的简化分析模型,分析不同地震动强度指标与超高层建筑结构抗震设计控制指标的相关性、离散度及其随结构基本周期的变化规律。并通过上海中心大厦(高632 m)的倒塌分析实例对不同地震动强度指标的适用性进行验证。结果表明:PGV与超高层结构的层间位移角响应具有较好的相关性,且离散度最小,可作为超高层建筑结构抗震分析和地震响应分析的地震动强度指标。
Ground motion Intensity Measure(IM) is an important basis for structural seismic design.A simplified analytical model for super high-rise buildings on the basis of the flexural-shear coupling beam model is developed in this work.The variation of correlation and dispersion between different IMs and the structural seismic response demand measures(DMs) are evaluated for different structural fundamental periods.A series of Incremental Dynamic Analysis(IDA) of the Shanghai Tower,with a total height of about 632 m,is carried out to verify the rationality of different IMs for super high-rise buildings.The numerical results indicate that with a minimum dispersion,PGV has a better correlation to story drift ratio than any other IMs.It is therefore recommended that PGV can be used as an IM for seismic design of super high-rise buildings.
Ground motion Intensity Measure(IM) is an important basis for structural seismic design.A simplified analytical model for super high-rise buildings on the basis of the flexural-shear coupling beam model is developed in this work.The variation of correlation and dispersion between different IMs and the structural seismic response demand measures(DMs) are evaluated for different structural fundamental periods.A series of Incremental Dynamic Analysis(IDA) of the Shanghai Tower,with a total height of about 632 m,is carried out to verify the rationality of different IMs for super high-rise buildings.The numerical results indicate that with a minimum dispersion,PGV has a better correlation to story drift ratio than any other IMs.It is therefore recommended that PGV can be used as an IM for seismic design of super high-rise buildings.
引文
[1]Miranda E,Taghavi S.Approximate floor acceleration demandsin multistory buildings.I:formulation[J].Journal ofStructural Engineering,2005,131(2):203-211
[2]ATC-63 Quantification of building seismic performance factors[R].FEMA,2008
[3]Baker J W,Cornell C A.A vectored-valued ground motionintensity measure consisting of spectral acceleration andepsilon[J].Earthquake Engineering and StructuralDynamics,2005,34(10):1193-1217
[4]Padgett J E,Nielson B G,DesRoches R.Selection ofoptimal intensity measures in probabilistic seismic demandmodels of highway bridge portfolios[J].EarthquakeEngineering&Structural Dynamics,2008,37(5):711-725
[5]Baker J W,Cornell C A.Vector-valued intensity measuresfor pulse-like near-fault ground motions[J].EngineeringStructures,2008,30(4):1048-1057
[6]Gulkan P,Sozen M A.Procedure for determining seismicvulnerability of building structures[J].ACI StructuralJournal,1999,96(3):336-342
[7]Miranda E,Akkar S D.Generalized interstory drift spectrum[J].Journal of Structural Engineering,2006,132(6):840-852
[8]Lu X,Lu X Z,Zhang W K,et al.Collapse simulation of asuper high-rise building subjected to extremely strongearthquakes[J].Science China-Technological Sciences,2011,54(10):2549-2560
[2]ATC-63 Quantification of building seismic performance factors[R].FEMA,2008
[3]Baker J W,Cornell C A.A vectored-valued ground motionintensity measure consisting of spectral acceleration andepsilon[J].Earthquake Engineering and StructuralDynamics,2005,34(10):1193-1217
[4]Padgett J E,Nielson B G,DesRoches R.Selection ofoptimal intensity measures in probabilistic seismic demandmodels of highway bridge portfolios[J].EarthquakeEngineering&Structural Dynamics,2008,37(5):711-725
[5]Baker J W,Cornell C A.Vector-valued intensity measuresfor pulse-like near-fault ground motions[J].EngineeringStructures,2008,30(4):1048-1057
[6]Gulkan P,Sozen M A.Procedure for determining seismicvulnerability of building structures[J].ACI StructuralJournal,1999,96(3):336-342
[7]Miranda E,Akkar S D.Generalized interstory drift spectrum[J].Journal of Structural Engineering,2006,132(6):840-852
[8]Lu X,Lu X Z,Zhang W K,et al.Collapse simulation of asuper high-rise building subjected to extremely strongearthquakes[J].Science China-Technological Sciences,2011,54(10):2549-2560
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心