地震动输入对中长周期结构抗倒塌性能评估的影响
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摘要
以太平洋地震研究中心下载的800条地震动记录为研究对象,验证了PGV/PGA比值,震中距和震级三个条件作为近场脉冲地震动选取原则的合理性。根据此原则选取其中10条近场脉冲地震动,同时选取ATC-63推荐的10条近场脉冲地震动与10条远场地震动。考察了三类地震动基本信息、反应谱及与规范谱频谱特性的差异性,进而对9层Benchmark钢结构模型进行增量动力分析,通过易损性曲线和结构抗倒塌系数研究不同地震动对中长周期结构抗倒塌性能评估的影响。研究结果表明:在中长周期段,本文选取的地震动平均反应谱值远大于其余两类地震动与中美规范反应谱,且在速度与位移反应谱中更为明显;地震动的选取对中长周期结构的抗震抗倒塌性能评估具有较大影响,近场脉冲地震动对中长周期结构作用最显著,结构迅速达到倒塌状态。
800 seismic records are downloaded from the Pacific Earthquake Engineering Research Center as the research object, the three conditions of PGV/PGA ratio, epicentral distance and magnitude are verified as the rationality of the selection principle of near-field pulse seismic records. According to this principle, 10 near-field pulse seismic records are selected, while 10 near-field pulse-type seismic records and 10 far-field seismic records recommended by ATC-63 are also selected. The differences between the basic information and response spectrum of the three types of ground motions and the differences in the spectrum characteristics between the response spectrum and the design response spectrum of Chinese Seismic Code and ASCE7-10 are investigated. The Incremental dynamic analysis of the 9-story Benchmark steel structure model is carried out. The effects of different ground motions on the evaluation of the anti-collapse performance of medium-long period structures are studied by the vulnerability curve and the collapse margin ratio. The research indicates that in the medium-long period, the ground motions average response spectrum value selected in this paper is much larger than the other two types of ground motions and the design response spectrum, and more obvious in the velocity and displacement response spectrum. The selection of ground motions has a great influence on the evaluation of the anti-seismic collapse performance of the medium-long period structure, the near-field pulse ground motions have the most significant effect on the medium-long period structure, and the structure quickly reaches the collapsed state.
800 seismic records are downloaded from the Pacific Earthquake Engineering Research Center as the research object, the three conditions of PGV/PGA ratio, epicentral distance and magnitude are verified as the rationality of the selection principle of near-field pulse seismic records. According to this principle, 10 near-field pulse seismic records are selected, while 10 near-field pulse-type seismic records and 10 far-field seismic records recommended by ATC-63 are also selected. The differences between the basic information and response spectrum of the three types of ground motions and the differences in the spectrum characteristics between the response spectrum and the design response spectrum of Chinese Seismic Code and ASCE7-10 are investigated. The Incremental dynamic analysis of the 9-story Benchmark steel structure model is carried out. The effects of different ground motions on the evaluation of the anti-collapse performance of medium-long period structures are studied by the vulnerability curve and the collapse margin ratio. The research indicates that in the medium-long period, the ground motions average response spectrum value selected in this paper is much larger than the other two types of ground motions and the design response spectrum, and more obvious in the velocity and displacement response spectrum. The selection of ground motions has a great influence on the evaluation of the anti-seismic collapse performance of the medium-long period structure, the near-field pulse ground motions have the most significant effect on the medium-long period structure, and the structure quickly reaches the collapsed state.
引文
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[2] 施炜,叶列平,陆新征,等.不同抗震设防RC框架结构抗倒塌能力的研究[J].工程力学,2011,28(03):41-48+68.SHI Wei,YE Lieping,LU Xinzheng,et al.Study on the collapse-resistant capacity of RC frames with different seismic fortification levels[J].Engineering Mechanics,2011,28(03):41-48+68.(in Chinese)
[3] Hall J F,Heaton T H,Halling M W,et al.Near-source ground motion and its effects on flexible buildings[J].Earthquake Spectra,1995,11(4):569-605.
[4] 杨迪雄,王汉兵,李刚.近断层地震动对短肢剪力墙高层结构地震反应的影响[J].地震工程与工程振动,2008,(06):106-115.YANG Dixiong,WANG Hanbing,LI Gang.Influence of near-fault ground motions on seismic responses of highrise structure with short-limb walls[J].Earthquake Engineering and Engineering Dynamics,2008,(06):106-115.
[5] 杨迪雄,李刚,程耿东.近断层脉冲型地震动作用下隔震结构地震反应分析[J].地震工程与工程振动,2005,(02):119-124.YANG Dixiong,LI Gang,CHENG Gengdong.Seismic analysis of base-isolated structures subjected to near-fault pulse-like ground motions[J].Earthquake Engineering and Engineering Dynamics,2005,(02):119-124.(in Chinese)
[6] 周颖,洪磊.地震动选取方法对超高层结构抗震性能的影响[J].地震工程与工程振动,2013,04(02):060-67.ZHOU Ying,HONG Lei.The effect of ground-motion selections on seismic performance of a super-tall structure[J].Earthquake Engineering and Engineering Dynamics,2013,04(02):060-67.(in Chinese)
[7] Applied Technology Council,Federal Emergency Management Agency.Quantification of building seismic performance factors[R].America:FEMA,2008.
[8] Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismological Society of America,2007,97(5):1486-1501.
[9] Loh C H,Wan S,Liao W Y.Effects of hysteretic model on seismic demands:consideration of near-fault ground motions[J].The Structural Design of Tall Buildings,2002,11(3):155-169.
[10] 李明.近断层地震动对结构抗震设计的影响研究[D].哈尔滨:中国地震局工程力学研究所,2010.LI Ming.Study on the effect of near-fault ground motion on structural seismic design[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,2010.(in Chinese)
[11] Shome N.Probabilistic seismic demand analysis of nonlinear structures[M].Stanford University,1999.
[12] GB50011-2010.建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB500l1-2010 Code for Seismic Design of Buildings[S].Beijing:Building Industry Press of China,2010.(in Chinese)
[13] American Society of Civil Engineers.Minimum Design Loads for Buildings and other Structures:ASCE 7-10[S].USA:ASCE,2010.
[14] 罗开海,王亚勇.中、美、欧抗震设计规范地震动参数换算关系的研究[J].建筑结构,2006,36(8):103-107.LUO Kaihai,WANG Yayong.Research on conversion relationships among the parameters of ground motions in seismic design codes of China,America and Europe[J].Building Structure,2006,36(8):103-107.(in Chinese)
[15] Ohtori Y,Spencer B F,Jr Dyke S J.Benchmark control problems for seismically excited nonlinear buildings[J].Journal of Engineering Mechanics,ASCE,2004,130(4):366-385.
[16] HAZUS99,User′s manual[S].Washington,D.C.:Federal Emergency Management Agency,l999.
[17] Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491.
[18] Sucuoglu H,Yucemen S,Gezer A,et al.Statistical evaluation of the damage potential of earthquake ground motions[J].Structural Safety,1999,20(4):357-378.