城市立交桥的近断层地震动输入模拟

PDF(2011 KB)

振动与冲击 ›› 2021, Vol. 40 ›› Issue (8) : 286-294.

论文

城市立交桥的近断层地震动输入模拟

刘周强，徐艳

作者信息 +

Near-fault ground motion input simulation of urban overpass

LIU Zhouqiang, XU Yan

Author information +

文章历史 +

摘要

立交桥作为城市交通网络的关键节点，其抗震安全性至关重要。针对立交桥在近断层地震动作用下易损的特点和此类地震动记录较少的事实，在比较简化脉冲和真实地震动记录的基础上，提出采用两步法构造近断层脉冲型地震动输入，研究在此作用下立交桥结构的地震响应特点。研究发现当简化脉冲周期与立交桥各子结构基本周期的比值在1～3结构反应较为剧烈，在1.5左右时，墩底内力达到最大值；当采用各子结构最不利简化脉冲周期对应的真实近断层地震动记录对结构进行输入时，短周期的匝道桥的地震响应与仅采用单个简化速度脉冲模拟输入的结果误差在15%左右；而对于中长周期的匝道桥及主线桥，需要采用两步构造法叠加高频成分，才能较好地还原真实地震动记录的影响。

Abstract

As a key node of urban traffic network, the seismic safety of overpass is very important. In view of the vulnerability of overpasses under the action of near-fault ground motion and the fact that such ground motion records are few, a two-step method was proposed to construct near-fault ground motion input based on the comparison of simplified impulse simulation and real ground motion records. And the seismic response characteristics of overpasses under such action were studied. It was found that when the ratio of the simplified pulse period to the basic period of each substructure of the overpass is between 1 and 3, the structural reaction is intense, and when it is around 1.5, the internal force of the pier bottom reaches the maximum value. When the real near-fault ground motion records corresponding to the most disadvantageous simplified pulse period of each substructure are used to input the structure, the error of the seismic response of the ramp bridge in a short period is about 15% under the simulated input of a single simplified velocity pulse and real one. For ramp bridges and main bridges with medium and long period, it is necessary to adopt the two-step construction method to superimpose the high frequency components, so as to better restore the effect of the real ground motion record.

导出引用

刘周强，徐艳. 城市立交桥的近断层地震动输入模拟[J]. 振动与冲击, 2021, 40(8): 286-294

LIU Zhouqiang, XU Yan. Near-fault ground motion input simulation of urban overpass[J]. Journal of Vibration and Shock, 2021, 40(8): 286-294

参考文献

［1］张菊辉,管仲国.立交匝道桥地震响应及合理抗震体系研究［J］.振动与冲击,2015,34(13):189-194.
ZHANG Juhui,GUAN Zhongguo. Seismic response analysis and reasonable aseismic system design for a viaduct ramp bridge［J］. Journal of Vibration and Shock, 2015,34(13):189-194.
［2］张菊辉,管仲国.匝道桥地震响应影响要素分析［J］.桥梁建设,2015(4):58-63.
ZHANG Juhui,GUAN Zhongguo. Analysis of factors influencing seismic responses of ramp bridges［J］. Bridge Construction, 2015(4):58-63.
［3］孟杰,刘钊,张建东.汶川地震回澜立交桥震害成因分析［J］.振动与冲击,2014,33(12):99-105.
MENG Jie,LIU Zhao,ZHANG Jiandong.Causation analysis of seismic failure for huilan flyover under wenchuan earthquake［J］. Journal of Vibration and Shock,2014,33(12):99-105.
［4］孙治国,王东升,郭迅,等.汶川大地震绵竹市回澜立交桥震害调查［J］.地震工程与工程振动,2009,29(4):132-138.
SUN Zhiguo,WANG Dongsheng,GUO Xun,et al. Damage investigation of Huilan interchange in Mianzhu after Wenchuan earthquake ［J］. Earthquake Engineering and Engineering Vibration,2009,29(4):132-138.
［5］王东升,郭迅,孙治国,等.汶川大地震公路桥梁震害初步调查［J］.地震工程与工程振动,2009,29(3):84-94.
WANG Dongsheng, GUO Xun, SUN Zhiguo,et al. Damage to highway bridges during Wenchuan earthquake［J］. Earthquake Engineering and Engineering Vibration,2009,29(3):84-94.
［6］KAWASHIMA K,TAKAHASHI Y,GE H, et al．Reconnaissance report on damage of bridges in 2008 Wenchuan，China，earthquake［J］. Journal of Earthquake Engineering,2009,13(7):965-996.
［7］陈学良,金星,高孟潭.近场速度脉冲场地响应等效线性分析的适用条件［J］.哈尔滨工程大学学报,2015,36(8):1049-1056.
CHEN Xueliang,JIN Xing,GAO Mengtan. Applicable conditions of the near-field site response of a large velocity pulse by equivalent linearization method［J］. Journal of Harbin Engineering University,2015,36(8):1049-1056.
［8］郭恩,周锡元,彭凌云,等.近断层地震动记录中速度大脉冲及其影响范围［J］.北京工业大学学报,2012,38(2):243-249.
GUO En,ZHOU Xiyuan,PENG Lingyun,et al. Big velocity pulses and their influence on near-fault ground motion records［J］. Journal of Beijing University of Technology,2012,38(2):243-249.
［9］陈令坤,张楠,蒋丽忠,等.高速铁路桥梁方向脉冲型近断层地震反应分析［J］.铁道工程学报,2013(9):40-46.
CHEN Lingkun,ZHANG Nan,JIANG Lizhong,et al. Analysis of seismic response of directivity pulse-like near-fault ground motion to bridge of high-speed railway［J］. Journal of Railway Engineering Society,2013(9):40-46.
［10］韩淼,孟令帅,杜红凯.近断层地震速度脉冲对层间隔震结构响应影响的振动台试验研究［J］.工程抗震与加固改造,2017,39(6):68-73.
HAN Miao,MENG Lingshuai,DU Hongkai. Shaking table tests on effect of near-fault ground motion velocity pulse on seismic responses of story isolation structure［J］. Earthquake Resistant Engineering and Retrofitting,2017,39(6):68-73.
［11］MAVROEIDIS G P. A mathematical representation of near-fault ground motions［J］. Bulletin of the Seismological Society of America, 2003, 93(3):1099-1131.
［12］ALAVI B, KRAWINKLER H. Consideration of near fault ground motion effect in seismic design［C］∥Proceedings of 12th World Conference Earthquake Engineering. Auckland：WCEE, 2000.
［13］MAKRIS N, CHANG S P. Effect of viscous, viscoplastic and friction damping on the response of seismic isolated structures［J］. Earthquake Engineering & Structural Dynamics, 2000, 29(1):85-107.
［14］徐艳,黄永福,李建中.脉冲型地震作用下斜拉桥纵向响应的简化计算［J］.华南理工大学学报(自然科学版),2015,43(2):41-47.
XU Yan,HUANG Yongfu,LI Jianzhong. Simplified calculation of longitudinal seismic response of cable-stayed bridges subjected to pulsed ground motions［J］. Journal of South China University of Technology(Natural Science),2015,43(2):41-47.
［15］GELAGOTI F.Estimation of strong motion experienced in the vicinity of the bolu viaduct during the 1999 Düzce earthquake:development and validation of a hybrid method［J］.Bulletin of the Seismological Society of America,2014,104(2):720-740.
［16］田玉基, 杨庆山, 卢明奇. 近断层脉冲型地震动的模拟方法［J］. 地震学报,2007，29(1)：77-84.
TIAN Yuji,YANG Qingshan,LU Mingqi. Simulation method of near-fault pulse type ground motion［J］. Acta Seismologica Sinica,2007，29(1)：77-84.
［17］王宇航. 近断层区域划分及近断层速度脉冲型地震动模拟［D］.成都：西南交通大学,2015.
［18］陈太聪,苏成,韩大建.复杂立交系统的有限元建模与抗震分析［J］.桥梁建设,2001(6):21-24.
CHEN Taicong,SU Cheng,HAN Dajian. Finite element modeling and aseismatic analysis of composite grade separation system［J］. Bridge Construction,2001(6):21-24.
［19］毕桂平,江涌.大型复杂立交工程中匝道桥抗震分析计算模型研究［J］.桥梁建设,2003(6):15-17.
BI Guiping,JIANG Yong. Study of calculation model for seismic analysis of ramp bridges of large and complicated interchange projects［J］. Bridge Construction, 2003(6):15-17.
［20］孙亦鸥,丁海平.基于小波方法的近断层地震动速度脉冲周期的统计特性［J］.华南地震, 2014(3):28-36.
SUN Yiou,DING Haiping. Statistical characteristics of velocity pulses for near-fault strong motions based on wavelet approach［J］. South China of Seismology, 2014(3):28-36.
［21］SEHHATI R, RODRIGUEZ-MAREK A, ELGAWADY M, et al. Effects of near-fault ground motionsand equivalent pulses on multi-story structures［J］. Engineering Structures, 2011, 33(3):767-779.
［22］王长龙.近断层地震动作用下钢框架结构的地震响应分析［D］.北京：北京交通大学,2008.
［23］同济大学.城市桥梁抗震设计规范:CJJ 166—2011［S］．北京：中国建筑工业出版社,2011．
［24］XU Y, LEE G C. Traveling wave effect on the seismic response of a steel arch bridge subjected to near fault ground motions［J］. Earthquake Engineering and Engineering Vibration,2007,6(3)：245-257.