建筑结构考虑刚度变化的Pushover水平侧向力分布
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摘要
为了考虑层间刚度对竖向不规则结构非线性静力分析结果的影响,提出了建筑结构考虑刚度变化的水平侧向力分布计算方法.在总结几种常见水平侧向力分布形式、分析单自由度体系运动方程的基础上,给出了单自由度、多自由度体系水平地震力与层间刚度的关系,提出了改进的水平侧向力分布形式.算例计算表明,本文方法可以找到多种侧向刚度不规则结构的薄弱层,得到的楼层侧移和层间位移角与时程分析结果符合较好.
In order to investigate the influence of story stiffness on the nonlinear static analysis,an improved lateral load distribution calculating method is provided for vertically irregular building structures.Based on conventional lateral load patterns and the analysis result of motion equation of single degree freedom system,the relationship between the horizontal earthquake action and the story stiffness of single degree freedom system and multi-degree freedom system was obtained.And then an improved lateral load distribution pattern was established for the nonlinear static analysis of vertically irregular structures.Through the pushover analysis and time-history analysis of four kinds of vertically irregular buildings,it is indicated that the improved procedure can detect the soft story and has high accuracy with the story displacement and inter-story drift ratio compared with the results obtained from time-history analysis.
In order to investigate the influence of story stiffness on the nonlinear static analysis,an improved lateral load distribution calculating method is provided for vertically irregular building structures.Based on conventional lateral load patterns and the analysis result of motion equation of single degree freedom system,the relationship between the horizontal earthquake action and the story stiffness of single degree freedom system and multi-degree freedom system was obtained.And then an improved lateral load distribution pattern was established for the nonlinear static analysis of vertically irregular structures.Through the pushover analysis and time-history analysis of four kinds of vertically irregular buildings,it is indicated that the improved procedure can detect the soft story and has high accuracy with the story displacement and inter-story drift ratio compared with the results obtained from time-history analysis.
引文
[1]中华人民共和国国家标准.建筑抗震设计规范(GB50010-2001)[S].北京:中国建筑工业出版社,2001.
[2]CHOPRA A K,GOEL R K.A modal pushover analysis procedure for estimating seismic demands for buildings[J].Earthquake Engineering and Structural Dynamics,2002,31(3):561-582.
[3]叶燎原,潘文.结构静力弹塑性分析(push-over)的原理和计算实例[J].建筑结构学报,2000,21(1):37-51.
[4]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.
[5]FEMA-356.Prestandard and Commentary for the Seis-mic Rehabilitation of Buildings[S].Reston:American Society of Civil Engineers,ASCE,2000.
[6]KALKAN E,KUNNATH S K.Lateral load distribution in nonlinear static procedures for seismic design[C]//Proceedings of the2004Structures Congress.Nashville,Tennessee,2004.
[7]KALKAN E,KUNNATH S K.Method of modal combi-nations for pushover analysis of buildings[C]//Proceed-ings of the13th World Conference on Earthquake Engi-neering.Vancouver,BC,2004.
[8]门进杰.不规则钢筋混凝土框架结构基于性能的抗震设计理论和方法[D].西安:西安建筑科技大学,2007.
[2]CHOPRA A K,GOEL R K.A modal pushover analysis procedure for estimating seismic demands for buildings[J].Earthquake Engineering and Structural Dynamics,2002,31(3):561-582.
[3]叶燎原,潘文.结构静力弹塑性分析(push-over)的原理和计算实例[J].建筑结构学报,2000,21(1):37-51.
[4]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89-97.
[5]FEMA-356.Prestandard and Commentary for the Seis-mic Rehabilitation of Buildings[S].Reston:American Society of Civil Engineers,ASCE,2000.
[6]KALKAN E,KUNNATH S K.Lateral load distribution in nonlinear static procedures for seismic design[C]//Proceedings of the2004Structures Congress.Nashville,Tennessee,2004.
[7]KALKAN E,KUNNATH S K.Method of modal combi-nations for pushover analysis of buildings[C]//Proceed-ings of the13th World Conference on Earthquake Engi-neering.Vancouver,BC,2004.
[8]门进杰.不规则钢筋混凝土框架结构基于性能的抗震设计理论和方法[D].西安:西安建筑科技大学,2007.
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