超高层建筑最小地震剪力系数的讨论和算例
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摘要
针对最小地震剪力系数这一超高层建筑结构抗震设计中的关键控制因素,对中美两国典型抗震规范和规程中有关最小地震剪力系数(最小基底剪力)的相关规定进行了对比综述。通过借鉴美国规范中最小基底剪力的处理方法,以我国8度区的某超高层建筑为例,采用两种不同的设计地震剪力取值方法设计了两个不同的方案模型。通过大量弹塑性时程分析,比较了两个模型大震下的抗震性能和抗倒塌能力。
The minimum shear force coefficient is the key issue of seismic design of super-tall buildings. Therefore,the requirements on the minimum base shear force in typical Chinese and U. S. seismic design codes and specifications are compared. Based on a super-tall building located in 8-degree seismic fortification region of China,two building models with different design base shear forces are designed according to the Chinese codes and the alternative method proposed in the U. S. specifications,respectively. With a large number of nonlinear time history analysis,the seismic performances and the collapse margin ratio of these two buildings under the severe earthquake are comparatively discussed.
The minimum shear force coefficient is the key issue of seismic design of super-tall buildings. Therefore,the requirements on the minimum base shear force in typical Chinese and U. S. seismic design codes and specifications are compared. Based on a super-tall building located in 8-degree seismic fortification region of China,two building models with different design base shear forces are designed according to the Chinese codes and the alternative method proposed in the U. S. specifications,respectively. With a large number of nonlinear time history analysis,the seismic performances and the collapse margin ratio of these two buildings under the severe earthquake are comparatively discussed.
引文
[1]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010 Code for Seismic Design of Buildings[S].Beijing:China Architecture&Building Press,2010.(in Chinese)
[2]汪大绥,周建龙,姜文伟,等.超高层结构地震剪力系数限值研究[J].建筑结构,2012,42(5):24-27.WANG Dasui,ZHOU Jianlong,JIANG Wenwei,et al.Research on seismic shear gravity ratio limit for super high-rise buildings higher than500 m[J].Building Structure,2012,42(5):24-27.(in Chinese)
[3]UBC1997.Uniform building code[S].Whittier,California:International Conference of Building Officials,1997.
[4]ASCE 7-05.Minimum Design Loads for Buildings and Other Structures[S].Reston,Virginia:American Society of Civil Engineers,2005.
[5]LATBSDC 2011.An Alternative Procedure for Seismic Analysis and Design of Tall Buildings Located in the Los Angeles Region[S].Los Angeles,California:Los Angeles Tall Buildings Structural Design Council,2011.
[6]PEER-2010/05.Guidelines for Performance-Based Seismic Design of Tall Buildings[S].Berkeley,California:Pacific Earthquake Engineering Research Center,University of California,2010.
[7]FEMA P695:Quantification of Building Seismic Performance Factors[S].Redwood City,California:Applied Technology Council,2009.
[8]Lu X,Lu X Z,Guan H,et al.Collapse simulation of reinforced concrete high-rise building induced by extreme earthquakes[J].Earthquake Engineering and Structural Dynamics,2013,42(5):705-723.
[9]Lu X,Lu X Z,Zhang W K,et al.Collapse simulation of a super high-rise building subjected to extremely strong earthquakes[J].Science China Technological Sciences,2011,54(10):2549-2560.
[2]汪大绥,周建龙,姜文伟,等.超高层结构地震剪力系数限值研究[J].建筑结构,2012,42(5):24-27.WANG Dasui,ZHOU Jianlong,JIANG Wenwei,et al.Research on seismic shear gravity ratio limit for super high-rise buildings higher than500 m[J].Building Structure,2012,42(5):24-27.(in Chinese)
[3]UBC1997.Uniform building code[S].Whittier,California:International Conference of Building Officials,1997.
[4]ASCE 7-05.Minimum Design Loads for Buildings and Other Structures[S].Reston,Virginia:American Society of Civil Engineers,2005.
[5]LATBSDC 2011.An Alternative Procedure for Seismic Analysis and Design of Tall Buildings Located in the Los Angeles Region[S].Los Angeles,California:Los Angeles Tall Buildings Structural Design Council,2011.
[6]PEER-2010/05.Guidelines for Performance-Based Seismic Design of Tall Buildings[S].Berkeley,California:Pacific Earthquake Engineering Research Center,University of California,2010.
[7]FEMA P695:Quantification of Building Seismic Performance Factors[S].Redwood City,California:Applied Technology Council,2009.
[8]Lu X,Lu X Z,Guan H,et al.Collapse simulation of reinforced concrete high-rise building induced by extreme earthquakes[J].Earthquake Engineering and Structural Dynamics,2013,42(5):705-723.
[9]Lu X,Lu X Z,Zhang W K,et al.Collapse simulation of a super high-rise building subjected to extremely strong earthquakes[J].Science China Technological Sciences,2011,54(10):2549-2560.
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