高速铁路上承式钢管砼拱桥地震响应差异比较
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摘要
以跨径为240m的西溪河大桥为工程背景,建立实桥三维有限元模型。在拱桥前6阶周期点与平台期附近,以备选地震波反应谱与设计反应谱谱值相对误差最小为双控指标(小于20%)选取时程分析波。分别采用时程分析法和反应谱法,对结构响应特点进行分析与总结。研究表明:纵、竖向位移主要由纵桥向激励贡献,横向位移则主要由横桥向激励贡献;纵桥向地震动与横桥向地震动基本不耦合;激励方向对响应特征影响较大,纵、横桥向激励下内力响应峰值差值可达20倍,而位移响应差值可以达到6倍,在进行该类桥梁抗震分析时需要加以重视。
The three-dimensional finite element model of the Xixi River Bridge with span of 240 m is established. The average relative errors between each record spectrum and the design response spectrum at two period portions, which include the first 6 mode period of the bridge structures and the flat part, are considered. By means of time history analysis and response spectrum method, the characteristics of response are summarized. The research result shows that: the longitudinal excitation is basically uncoupled from the transverse excitation, the direction of excitation has a great influence on the response characteristics, the peak value difference between the internal force responses excited by longitudinal and transverse excitation respectively can be up to 20 times,while the difference of displacement can be up to 6 times.
The three-dimensional finite element model of the Xixi River Bridge with span of 240 m is established. The average relative errors between each record spectrum and the design response spectrum at two period portions, which include the first 6 mode period of the bridge structures and the flat part, are considered. By means of time history analysis and response spectrum method, the characteristics of response are summarized. The research result shows that: the longitudinal excitation is basically uncoupled from the transverse excitation, the direction of excitation has a great influence on the response characteristics, the peak value difference between the internal force responses excited by longitudinal and transverse excitation respectively can be up to 20 times,while the difference of displacement can be up to 6 times.
引文
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[12] GB50111-2006,铁路工程抗震设计规范[S]GB50111-2006,Code for seismic design of railway engineering[S](in Chinese)
[2] 陈礼榕,陈宝春.钢管混凝土哑铃形截面拱桥应用与分析[J]. 广西大学学报(自然科学版),2016,41(1):270-275Chen Li-rong,Chen Bao-chun. Application and analysis of concrete-filled steel tubular arch bridge with arc rib of dumbbell-shaped cross section[J].Journal of Guangxi University (Nat Sci Ed),2016,41(1):270-275(in Chinese)
[3] 王菲,田山坡,禚一.非规则公路桥梁弹塑性地震响应分析[J].铁道工程学报,2012,(12):78-84Wang Fei,Tian Shan-po,Zhuo Yi. Analysis elastic-plastic seismic response of non-regular highw-ay bridge[J].Journal of Railway Engineering Society,2012,(12):78-84(in Chinese)
[4] 范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2004:16-17Fan Li-chu,Hu Shi-de,Ye Ai-jun. Seismic design of longspan bridge[M].Beijing: China Communications Press,2004:16-17(in Chinese)
[5] 包立新,李小珍,卫星,等.宜宾长江公路大桥斜拉桥抗震性能评价[J].工程力学,2008,25(2):174-182Bao Li-xin,Li Xiao-zhen,Wei Xing,et al. Evaluation of seismic resistance capacity for yibin yangtze river cable-stayed bridge[J]. Engineering Mechanics,2008,25(2):174-182(in Chinese)
[6] 揭志羽,卫星,李亚东,等.大跨高墩小半径刚构-连续组合梁桥地震响应分析[J].桥梁建设,2013,43(1):52-58Jie Zhi-yu,Wei Xing,Li Ya-dong,et al. Analysis of seismic response of long span ,high rise pier and short radius curved hybrid bridge of rigid frame continuous girder[J]. Bridge Construction,2013,43(1):52-58(in Chinese)
[7] GB50011-2010,建筑抗震设计规范[S]GB50011-2010, Code for seismic design of buildings[S](in Chinese)
[8] 王亚勇.关于设计反应谱、时程法和能量方法探讨[J].建筑结构学报,2000,21(1):21-28Wang Ya-yong. A view of seismic response spectra,time history analysis and energy method[J]. Journal of Building Structures,2000,21(1):21-28(in Chinese)
[9] 杨溥,李英民,赖明.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):33-37Yang Pu,Li Ying-min,Lai Ming. The selection control index of seismic wave for time history analysis[J]. China Civil Engineering Journal,2000,33(6):33-37(in Chinese)
[10] 王东升,岳茂光,李晓莉,等.高墩桥梁抗震时程分析输入地震波选择[J].土木工程学报,2013,46(S1):208-213Wang Dong-sheng,Yue Mao-guang,Li Xiao-li,et al. Selection of real ground motion in seismic history analysis for bridge with high columns[J]. China Civil Engineering Journal,2013,46(S1):208-213(in Chinese)
[11] Iervolino I,Cornell C A . Record selection for nonlinear seismic analysis of structures[J].Earthquake Spectra,2005,21(3):685-713
[12] GB50111-2006,铁路工程抗震设计规范[S]GB50111-2006,Code for seismic design of railway engineering[S](in Chinese)
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