桥梁墩柱在近断层水平多脉冲地震动作用下响应特征分析

柳春光,2,夏春旭1

振动与冲击 ›› 2017, Vol. 36 ›› Issue (2) : 95-100.

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PDF(1258 KB)
振动与冲击 ›› 2017, Vol. 36 ›› Issue (2) : 95-100.
论文

桥梁墩柱在近断层水平多脉冲地震动作用下响应特征分析

  • 柳春光 ,2,夏春旭1
作者信息 +

Characteristic response analysis of bridge piers under multi-pulse near-fault earthquake excitation

  • XIA Chunxu1,LIU Yingzhou1,LIU Chunguang1,2
Author information +
文章历史 +

摘要

对桥梁墩柱在近断层水平多脉冲地震动激励下的响应特征进行了研究。采用多脉冲小波分析方法从选取的22组地震动中识别出17组为脉冲型近断层地震动并确定了相关参数。采用时域叠加小波方法将这些时程与目标反应谱匹配得到匹配时程,通过匹配前后的时程和反应谱对比验证了匹配的有效性。基于OpenSees建立了四根桥梁墩柱模型并通过模态分析与Pushover分析验证了模型的合理性与准确性,加载匹配后的地震激励并分析其响应特征。分析表明,匹配时程的反应谱与目标反应谱基本一致,模型与试验的位移延性能力相对误差不超过5%。水平面内脉冲能量最强方向的地震输入能量大于水平面其他方向的输入能量,结构对应的地震需求也最大。从位移延性需求的角度应考虑水平最强能量的输入方向,抽取一个主要脉冲波形来替代原地震输入的做法偏于危险,应考虑多脉冲形式来代替单脉冲形式。

Abstract

The response patterns of bridge piers under the excitation of multi-pulse near-fault earthquake were investigated. 17 out of 22 sets of earthquake motions were characterized as pulse-like near-fault motions utilizing the multi-pulse analysis method and relevant parameters were determined meanwhile. The corresponding 17 sets of acceleration time histories whose spectra were compatible with the target spectrum were obtained by virtue of the superposition of time domain wavelet strategy. The effectiveness of the matching results were validated by comparing the time histories and elastic response spectra before and after match process. Four bridge piers were modeled by using OpenSees,and the reasonability and accuracy of the four piers model were validated throught the modal analysis and pushover analysis. The matched time histories were taken as the earthquake excitations and the characteristic responses of piers were analyzed. The analysis results indicate that the matched time histories and corresponding response spectra agree well with the target spectrum,and the relative error of the displacement ductility capability between the results of finite element analysis and experiments locates within 5%. The seismic input energy in the horizontal direction corresponding to the strongest pulse energy is greater than those in other horizontal directions,and the seismic demand of bridge piers in that direction is the greatest. From the aspect of displacement ductility demand,the direction of the strongest level of input energy should be considered,and it is dangerous to represent the seismic input by single pulse waveform,hence multiple pulses mode should be adopted instead of single pulse mode.

关键词

多脉冲分析 / 近断层 / 反应谱匹配 / 桥梁墩柱 / 延性

Key words

multi-pulse analysis / near-fault earthquake / spectrum match / bridge pier / ductility

引用本文

导出引用
柳春光,2,夏春旭1. 桥梁墩柱在近断层水平多脉冲地震动作用下响应特征分析[J]. 振动与冲击, 2017, 36(2): 95-100
XIA Chunxu1,LIU Yingzhou1,LIU Chunguang1,2. Characteristic response analysis of bridge piers under multi-pulse near-fault earthquake excitation[J]. Journal of Vibration and Shock, 2017, 36(2): 95-100

参考文献

[1] 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.
[2] Alavi B, Krawinkler H. Consideration of near-fault ground motion effects in seismic design[C]// 12th World Conference on Earthquake Engineering. Auckland, New Zealand, 2000.
[3] Mavroeidis G P, Papageorgiou A S. A mathematical representation of near-fault ground motions[J]. Bulletin of the Seismological Society of America, 2003. 93(3): 1099-1131.
[4] 张郁山,赵凤新. 基于小波函数的地震动反应谱拟合方法[J]. 土木工程学报, 2014.47(1):70-81.
Zhang Yushan, Zhao Fengxin. Matching method of ground-motion response spectrum based on the wavelet function[J]. China Civil Engineering Journal, 2014.47(1):70-81.
[5] 全伟,李宏男. 调整已有地震动拟和规范反应谱人造地震动方法比较[J]. 防灾减灾工程学报, 2008.28(01): 91-97.
QUAN Wei,LI Hong-nan.Comparison of Methods of Generation of Spectrum-compatible Artificial Earthquake through the Modification of Available Records[J].Journal of Disaster Prevention and Mitigation Engineering, 2008.28(01):91-97.
[6] Al-Atik L, Abrahamson N. An Improved Method for Nonstationary Spectral Matching[J]. Earthquake Spectra, 2010, 26(3):601-617.
[7] Silvar M, et al., OpenSees Users Comman Manual, 2003, PEER, University of California,Berkeley.
[8] 李笑然,王元丰. 基于纤维模型的钢筋混凝土柱滞回性能数值分析[J]. 北京交通大学学报, 2012.36(06):68-73.
LI Xiao-ran,WANG Yuan-feng. Numerical analysis of RC columns under reversed cyclic loading based on fiber model[J]. Journal of Beijing Jiaotong University, 2012.36(06):68-73.
[9] 柳春光,夏春旭. 台湾集集地震近断层多脉冲地震动分类及特性研究[J]. 中国科技论文, 2015.10(09):1043-1049.
LIU Chun-guang, XIA Chun-xu. Classification and characterization of multi-pulse near-fault strong ground motion in Taiwan Chi-Chi earthquake event[J].CHINA SCIENCEPAPER, 2015.10(09):1043-1049.
[10] 刘彦辉,谭平,周福霖,等. 双室薄壁钢筋混凝土桥墩抗震性能试验研究[J]. 土木工程学报, 2012.45(S1):90-95.
LIU Yan-hui,TAN Ping,ZHOU Fu-lin,et al. Experimental study of Performance for the double-chambers thin wall Concrete pier[J].China Civil Engineering Journal, 2012.45(S1):90-95.
[11] 顾祥林, 黄庆华,吴周偲. 钢筋混凝土柱考虑损伤累积的反复荷载-位移关系分析[J]. 地震工程与工程振动, 2006.26(04):68-74.
GU Xiang-lin,HUANG Qing-hua,WU Zhou-si.Analysis of load-displacement relationship for RC columns under reversed load considering accumulative damage[J].Earthquake Engineering and Engineering Vibration, 2006.26(04):68-74.
[12] 梁智垚. 桥梁高墩位移延性能力计算方法研究[J]. 工程抗震与加固改造, 2005.27(05):57-62.
LIANG Zhi-yao. Study on Calculational Methods of Displacement Ductility Capacity of Tall Pier[J]. Earthquake Resistant Engineering and Retrofitting, 2005.27(05):57-62.

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