近断层地震输入角对连续刚构桥地震响应的影响
|
摘要
在采用时程分析进行桥梁抗震研究时,通常沿单一轴进行地震动输入,但是近断层地震动可能会产生速度脉冲,而速度脉冲可能存在于一个方向,也有可能存在于两个方向上,如果只沿单一轴输入地震波,也许就会得到过于保守的分析结果。本文选择2条近断层地震波和1条远场地震波,按15°间隔从0°~90°计算了7个输入角时桥梁的地震响应,发现连续刚构桥的地震响应随地震输入角的变化可能会有较大的不同,建议在进行近断层地震动时程分析时,最好考虑地震输入角的影响,为减小计算量,可采用每条地震波以0°和90°两个地震输入角进行计算并取二者中的较大者作为该条地震波计算结果。
In the time history analysis of seismic research on bridge,seismic wave usually had been input along a single axis. However,the near fault ground motion may produce velocity pulse,and the pulse may exist in one direction or in two directions. If seismic waves had been input only along a single axis,the too conservative analysis results may be got. In this paper,two near fault earthquake waves and one far field seismic wave are selected,and the seismic response of the bridge is calculated when input angle according to 15 °from 0 ° ~ 90 °. It found that the responses changes with the different input angle of earthquake might have different seismic response of continuous rigid frame bridge. In the near fault ground motion time history analysis of continuous rigid frame bridge,earthquake input angle is proposed to consider. In order to reduce the amount of calculation,the larger one of seismic responses of bridge is adopted when input angles are 0 ° and 90 °.
In the time history analysis of seismic research on bridge,seismic wave usually had been input along a single axis. However,the near fault ground motion may produce velocity pulse,and the pulse may exist in one direction or in two directions. If seismic waves had been input only along a single axis,the too conservative analysis results may be got. In this paper,two near fault earthquake waves and one far field seismic wave are selected,and the seismic response of the bridge is calculated when input angle according to 15 °from 0 ° ~ 90 °. It found that the responses changes with the different input angle of earthquake might have different seismic response of continuous rigid frame bridge. In the near fault ground motion time history analysis of continuous rigid frame bridge,earthquake input angle is proposed to consider. In order to reduce the amount of calculation,the larger one of seismic responses of bridge is adopted when input angles are 0 ° and 90 °.
引文
[1]杜晨晓,谢富仁,张扬,等.1976年Ms7.8唐山地震断层动态破裂及近断层强地面运动特征[J].地球物理学报,2010,53(2):290~304Du Chen-xiao,Xie Fu-ren,Zhang Yang,et al.3D Modeling of Dynamic Fault Rupture and Strong Ground Motion of the1976 MS 7.8 Tangshan Earthquake[J].Chinese Journal of Geophysics,2010,53(2):290~304(in Chinese)
[2]谢俊举,温增平,李小军,等.基于小波方法分析汶川地震近断层地震动的速度脉冲特性[J].地球物理学报,2012,55(6):1963~1972Xie Jun-ju,Wen Zeng-ping,Li Xiao-jun,et al.Analysis of Velocity Pulses for Near-fault Strong Motionsfrom the Wenchuan Earthquake Based on Wavelet Method[J].Chinese Journal of Geophysics,2012,55(6):1963~1972(in Chinese)
[3]徐龙军,谢礼立.集集地震近断层地震动频谱特性[J].地震学报,2005,27(6):656~665Xu Long-jun,Xie Li-li.Characteristics of Frequency Content of Near-fault Ground Motions During the Chi-chi Earthquake[J].Acta Seismologica Sinica,2005,27(6):656~665(in Chinese)
[4]韦韬,赵凤新,张郁山.近断层速度脉冲的地震动特性研究[J].地震学报,2006,28(6):629~637Wei Tao,Zhao Feng-xin,Zhang Yu-shan.Characteristics of Near-fault Ground Motion Containing Velocity Pulses[J].Acta Seismologica Sinica,2006,28(6):629~637(in Chinese)
[5]Bouchon M,Toksz N,Karabulut H,et al.Seismic Imaging of the 1999 Izmit(Turkey)Rupture Inferred from the Near-fault Recordings[J].Geophysical Research Letters,2000,27(18):3013~3016
[6]冯云田,李明瑞,林春哲.复杂结构的弹性地震反应分析[J].地震工程与工程振动,1991,11(4):78~87Feng Yun-tian,Li Ming-rui,Lin Chun-zhe.Elastic Earthquake Analysis of Complicated Structure[J].Earthquake Engineering and Engineering Vibration,1991,11(4):78~87(in Chinese)
[7]聂利英,李建中,范立础.复杂结构地震动输入方向的基本原理及其影响[J].地震工程与工程振动,2003,23(3):30~34Nie Li-ying,Li Jian-zhong,Fan Li-chu.Principle and Effect of Critical Angle of Complicated Structure in Dynamic Analysis[J].Earthouake Engineering And Engineering Vibration,2003,23(3):30~34(in Chinese)
[8]OSCAR A L,Ronald T.The Critical Angle of Seismic Incidence and the Maximum Structural Response[J].EESD,l997,26:881~894
[9]宋波,潘建仕.基于Pushover法的曲线桥地震波输人最不利角度分析[J].北京科技大学学报,2008,30(11):1223~1229Song Bo,Pan Jian-shi.Pushover-method-based Analyses of Critical Angle to the Seismic Response of Curved Bridges[J].Journal of University of Science and Technology Bejing,2008,30(11):1223~1229(in Chinese)
[10]柏亚双,孙景江,徐国林.偏心结构双向水平地震反应谱输入问题研究[J].世界地震工程,2009,25(3):20~24Bai Ya-shuang,Sun Jing-jiang,Xu Guo-lin.Study on Bidirectional Horizontal Seismic Response Spectrum Inputs of Eccentric Structures[J].World Earthquake Engineering,2009,25(3):20~24
[11]陈力波.汶川地区公路桥梁地震易损性分析研究[D].成都:西南交通大学,2012Chen Li-bo.Seismic Vulnerability Ananlysis for Highway Bridges in Wenchuan Region[D].Chengdu:Southwest Jiaotong University,2012(in Chinese)
[2]谢俊举,温增平,李小军,等.基于小波方法分析汶川地震近断层地震动的速度脉冲特性[J].地球物理学报,2012,55(6):1963~1972Xie Jun-ju,Wen Zeng-ping,Li Xiao-jun,et al.Analysis of Velocity Pulses for Near-fault Strong Motionsfrom the Wenchuan Earthquake Based on Wavelet Method[J].Chinese Journal of Geophysics,2012,55(6):1963~1972(in Chinese)
[3]徐龙军,谢礼立.集集地震近断层地震动频谱特性[J].地震学报,2005,27(6):656~665Xu Long-jun,Xie Li-li.Characteristics of Frequency Content of Near-fault Ground Motions During the Chi-chi Earthquake[J].Acta Seismologica Sinica,2005,27(6):656~665(in Chinese)
[4]韦韬,赵凤新,张郁山.近断层速度脉冲的地震动特性研究[J].地震学报,2006,28(6):629~637Wei Tao,Zhao Feng-xin,Zhang Yu-shan.Characteristics of Near-fault Ground Motion Containing Velocity Pulses[J].Acta Seismologica Sinica,2006,28(6):629~637(in Chinese)
[5]Bouchon M,Toksz N,Karabulut H,et al.Seismic Imaging of the 1999 Izmit(Turkey)Rupture Inferred from the Near-fault Recordings[J].Geophysical Research Letters,2000,27(18):3013~3016
[6]冯云田,李明瑞,林春哲.复杂结构的弹性地震反应分析[J].地震工程与工程振动,1991,11(4):78~87Feng Yun-tian,Li Ming-rui,Lin Chun-zhe.Elastic Earthquake Analysis of Complicated Structure[J].Earthquake Engineering and Engineering Vibration,1991,11(4):78~87(in Chinese)
[7]聂利英,李建中,范立础.复杂结构地震动输入方向的基本原理及其影响[J].地震工程与工程振动,2003,23(3):30~34Nie Li-ying,Li Jian-zhong,Fan Li-chu.Principle and Effect of Critical Angle of Complicated Structure in Dynamic Analysis[J].Earthouake Engineering And Engineering Vibration,2003,23(3):30~34(in Chinese)
[8]OSCAR A L,Ronald T.The Critical Angle of Seismic Incidence and the Maximum Structural Response[J].EESD,l997,26:881~894
[9]宋波,潘建仕.基于Pushover法的曲线桥地震波输人最不利角度分析[J].北京科技大学学报,2008,30(11):1223~1229Song Bo,Pan Jian-shi.Pushover-method-based Analyses of Critical Angle to the Seismic Response of Curved Bridges[J].Journal of University of Science and Technology Bejing,2008,30(11):1223~1229(in Chinese)
[10]柏亚双,孙景江,徐国林.偏心结构双向水平地震反应谱输入问题研究[J].世界地震工程,2009,25(3):20~24Bai Ya-shuang,Sun Jing-jiang,Xu Guo-lin.Study on Bidirectional Horizontal Seismic Response Spectrum Inputs of Eccentric Structures[J].World Earthquake Engineering,2009,25(3):20~24
[11]陈力波.汶川地区公路桥梁地震易损性分析研究[D].成都:西南交通大学,2012Chen Li-bo.Seismic Vulnerability Ananlysis for Highway Bridges in Wenchuan Region[D].Chengdu:Southwest Jiaotong University,2012(in Chinese)
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