扭转不规则结构水平侧向力分布模式与pushover分析
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摘要
水平侧向力分布模式的施加问题是合理进行pushover分析的关键环节。对于可以简化为平面模型的结构,传统的水平侧向力分布模式表现出较好的适用性,但对于因扭转不规则而导致必须采用空间模型的结构则并不适用。为此,针对扭转不规则结构的水平侧向力分布模式问题,并基于该类结构的地震响应特征,通过引入水平侧向力调整系数和水平侧向力分配系数,提出了扭转不规则结构改进的水平侧向力分布模式。对一具有典型扭转不规则特性的空间钢框架结构分别进行改进分布模式下的pushover分析和IV类场地典型地震动作用下的弹塑性时程分析,计算结果显示:改进分布模式下的pushover分析体现出扭转效应对结构反应的影响,并在一定程度上反映出更多的结构抗震信息,验证了所提出模式的可行性,说明pushover分析法也同样适用于扭转不规则结构。
The influence of lateral-load pattern on models is a key to pushover analysis.For a structure which can be simplified to a plane model,the traditional lateral-load pattern shows a practical application.But it doesn't work when it comes to those that must be simulated as a space model because of torsion-irregular.Aiming at finding an appropriate lateral-load pattern for pushover analysis of torsion-irregular structures,and based on the seismic response of torsion-irregular structures,a modified lateral-lode pattern is produced by introducing the lateral-load adjustment coefficient and the lateral-load distribution coefficient.These two coefficients can consider the issue of uneven stiffness distribution and the influence of high order modes respectively.At last,an example using both SAP2000 for pushover analysis and dynamic time-history analysis testifies the feasibility and validity of the proposed model.The result shows that the modified pushover analysis can get more structural seismic information than dynamic time-history analysis,and it proves the potentiality of the use of pushover analysis in torsion-irregular structures.
The influence of lateral-load pattern on models is a key to pushover analysis.For a structure which can be simplified to a plane model,the traditional lateral-load pattern shows a practical application.But it doesn't work when it comes to those that must be simulated as a space model because of torsion-irregular.Aiming at finding an appropriate lateral-load pattern for pushover analysis of torsion-irregular structures,and based on the seismic response of torsion-irregular structures,a modified lateral-lode pattern is produced by introducing the lateral-load adjustment coefficient and the lateral-load distribution coefficient.These two coefficients can consider the issue of uneven stiffness distribution and the influence of high order modes respectively.At last,an example using both SAP2000 for pushover analysis and dynamic time-history analysis testifies the feasibility and validity of the proposed model.The result shows that the modified pushover analysis can get more structural seismic information than dynamic time-history analysis,and it proves the potentiality of the use of pushover analysis in torsion-irregular structures.
引文
[1]李刚,程耿东.基于性能的结构抗震设计-理论、方法与应用[M].北京:科学出版社,2004:294-305.LI Gang,CHENG Gengdong.Performance-based seismic design-theory,method and application[M].Beijing:Science Press,2004:294-305.(inChinese)
[2]毛建猛,谢礼立,翟长海.模态pushover分析方法的研究和改进[J].地震工程与工程振动,2006,26(4):50-55.MAO Jianmeng,XIE Lili,ZHAI Changhai.Studies on and improvements in modal pushover analysis[J].Journal of Earthquake Engineering andEngineering Vibration,2006,26(4):50-55.(in Chinese)
[3]唐玉.平面不规则钢结构基于性能抗震设计方法研究[D].上海:上海理工大学,2010.TANG Yu.Research on performance-based seismic design method to irregular plane steel structure[D].Shanghai:University of Shanghai for Sci-ence and Technology,2010.(in Chinese)
[4]孙爱伏,欧进萍.高层钢结构抗震pushover分析的侧向力分布模式及其影响[J].地震工程与工程振动,2008,28(4):88-93.SUN Aifu,OU Jinping.Lateral action patterns and their effects on pushover seismic analysis of steel tall buildings[J].Journal of Earthquake Engi-neering and Engineering Vibration,2008,28(4):88-93.(in Chinese)
[5]侯爱波,汪梦甫,周锡元.Pushover分析方法中各种不同的侧向力荷载分布方式的影响[J].世界地震工程,2007,23(3):120-128.HOU Aibo,WANG Mengfu,ZHOU Xiyuan.The effect of many different lateral load patterns in the pushover analysis[J].World Earthquake Engi-neering,2007,23(3):120-128.(in Chinese)
[6]张凯,刘洪兵,王巍峰,等.竖向不规则结构的抗震性能评估[J].振动与冲击,2009,28(7):175-178.ZHANG Kai,LIU Hongbing,WANG Weifeng,et al.Seismic Performance evaluation for vertical irregular structure[J].Journal of Vibration andShock,2009,28(7):175-178.(in Chinese)
[7]GB50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Buildings[S].(in Chinese)
[8]FEMA356.Prestandard and Commentary for the Seismic Rehabilitation of Buildings[R].Washington DC:Federal Emergency Management Agen-cy,2000.
[2]毛建猛,谢礼立,翟长海.模态pushover分析方法的研究和改进[J].地震工程与工程振动,2006,26(4):50-55.MAO Jianmeng,XIE Lili,ZHAI Changhai.Studies on and improvements in modal pushover analysis[J].Journal of Earthquake Engineering andEngineering Vibration,2006,26(4):50-55.(in Chinese)
[3]唐玉.平面不规则钢结构基于性能抗震设计方法研究[D].上海:上海理工大学,2010.TANG Yu.Research on performance-based seismic design method to irregular plane steel structure[D].Shanghai:University of Shanghai for Sci-ence and Technology,2010.(in Chinese)
[4]孙爱伏,欧进萍.高层钢结构抗震pushover分析的侧向力分布模式及其影响[J].地震工程与工程振动,2008,28(4):88-93.SUN Aifu,OU Jinping.Lateral action patterns and their effects on pushover seismic analysis of steel tall buildings[J].Journal of Earthquake Engi-neering and Engineering Vibration,2008,28(4):88-93.(in Chinese)
[5]侯爱波,汪梦甫,周锡元.Pushover分析方法中各种不同的侧向力荷载分布方式的影响[J].世界地震工程,2007,23(3):120-128.HOU Aibo,WANG Mengfu,ZHOU Xiyuan.The effect of many different lateral load patterns in the pushover analysis[J].World Earthquake Engi-neering,2007,23(3):120-128.(in Chinese)
[6]张凯,刘洪兵,王巍峰,等.竖向不规则结构的抗震性能评估[J].振动与冲击,2009,28(7):175-178.ZHANG Kai,LIU Hongbing,WANG Weifeng,et al.Seismic Performance evaluation for vertical irregular structure[J].Journal of Vibration andShock,2009,28(7):175-178.(in Chinese)
[7]GB50011-2010建筑抗震设计规范[S].GB 50011-2010 Code for Seismic Design of Buildings[S].(in Chinese)
[8]FEMA356.Prestandard and Commentary for the Seismic Rehabilitation of Buildings[R].Washington DC:Federal Emergency Management Agen-cy,2000.
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