近断层地震作用下大跨CFST拱桥的动力稳定性
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摘要
为研究大跨度CFST(钢管混凝土)拱桥在近断层地震作用下的动力稳定性能,以主跨132 m的下承式钢管混凝土拱桥为工程背景,以台湾集集地震记录作为横向输入,采用动态增量分析(IDA)方法,对动力失稳临界荷载的确定进行了探讨.为提高IDA的分析效率,采用了高性能数值计算并行处理方法.此外,还讨论了加强IDA曲线簇收敛的问题.结果表明:脉冲型近震可导致非线性极值动力失稳,失稳临界荷载明显降低;采用加权平均加速度峰值作为地震强度指标,能显著改善IDA曲线簇的离散性,有利于揭示近断层地震对钢管混凝土拱桥造成动力失稳的特点.
In order to research the dynamic stability performances of long-span CFST(concrete-filled steel tubular) arch bridges under the action of near-fault ground motions,an arch bridge with a 132 m main span was taken as the engineering background,and seismic records of the Chi-Chi earthquake in Taiwan,China were set as transverse inputs.The incremental dynamic analysis(IDA) was adopted to determine the critical load of dynamic instability.To increase the efficiency of IDA,the parallel high-performance numerical computing was employed.In addition,the problem of strengthening IDA curve cluster convergence was discussed.The research result shows that near-fault pulse-like ground motions are likely to bring about a great damage and result in nonlinear dynamical limit-load instability,and the corresponding critical load is decreased evidently.Weighted average peak ground acceleration,an new intensity measure,can make the discreteness of IDA curve cluster be improved significantly to avail to reveal the dynamic instability characteristics of CFST arch bridges caused by near-fault ground motions.
In order to research the dynamic stability performances of long-span CFST(concrete-filled steel tubular) arch bridges under the action of near-fault ground motions,an arch bridge with a 132 m main span was taken as the engineering background,and seismic records of the Chi-Chi earthquake in Taiwan,China were set as transverse inputs.The incremental dynamic analysis(IDA) was adopted to determine the critical load of dynamic instability.To increase the efficiency of IDA,the parallel high-performance numerical computing was employed.In addition,the problem of strengthening IDA curve cluster convergence was discussed.The research result shows that near-fault pulse-like ground motions are likely to bring about a great damage and result in nonlinear dynamical limit-load instability,and the corresponding critical load is decreased evidently.Weighted average peak ground acceleration,an new intensity measure,can make the discreteness of IDA curve cluster be improved significantly to avail to reveal the dynamic instability characteristics of CFST arch bridges caused by near-fault ground motions.
引文
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[2]Federal Emergency Management Agency.FEMA-350Recommended seismic design criteria for new steelmoment-frame buildings[S].Washington:SAC JointVenture,2000.
[3]徐艳,胡世德.钢管混凝土拱桥的动力稳定极限承载力研究[J].土木工程学报,2006,39(9):68-73.XU Yan,HU Shide.A study on the dynamic ultimatecapacity of CFST arch bridges[J].China CivilEngineering Journal,2006,39(9):68-73.
[4]王海云,谢礼立.近断层强地震动的特点[J].哈尔滨工业大学学报,2006,38(12):2070-2076.WANG Haiyun,XIE Lili.Characteristics of near-faultstrong ground motions[J].Journal of Harbin Institute ofTechnology,2006,38(12):2070-2076.
[5]李爽,谢礼立.近场问题的研究现状与发展方向[J].地震学报,2007,29(1):102-111.LI Shuang,XIE Lili.Progress and trend on near-fieldproblems in civil engineering[J].Acta SeismologicaSinica,2007,29(1):102-111.
[6]李小军.对近年大震震害现象与工程地震问题研究的思考[J].国际地震动态,2001(8):26-32.LI Xiaojun.Comments on phenomena of greatearthquake damages and engineering seismologicalresearches[J].Recent Developments in World Seis-mology,2001(8):26-32.
[7]李忠学,沈祖炎,邓长根.钢网壳模型的动力稳定性振动台试验研究[J].实验力学,1999,14(4):482-491.LI Zhongxue,SHEN Zuyan,DENG Changgen.Research on the dynamic stability of steel reticulatedshells via shaking table test[J].Journal of Experi-mental Mechanics,1999,14(4):482-491.
[8]陈应波,陈军明,吴代华.网壳结构在地震作用下的动力稳定研究[J].华中科技大学学报:自然科学版,2004,32(10):40-42.CHEN Yingbo,CHEN Junming,WU Daihua.Dynamicstability of reticulated shell under earthquakeexcitation[J].Journal of Huazhong University ofScience and Technology:Natural Science,2004,32(10):40-42.
[9]邢帆.钢管拱桥近断层地震响应及动力稳定研究[D].成都:西南交通大学土木工程学院,2011.
[10]蒲黔辉,霍学晋,杨永清.基于统一理论的蝶形拱桥空间稳定性分析[J].西南交通大学学报,2010,45(6):868-874.PU Qianhui,HUO Xuejin,YANG Yongqing.Spatialstability analysis of butterfly-shape arch bridges basedon unified theory[J].Journal of Southwest JiaotongUniversity,2010,45(6):868-874.
[11]张建民,郑皆连,肖汝诚.钢管混凝土拱桥的极限承载能力分析[J].中南公路工程,2004,29(4):24-28.ZHANG Jianmin,ZHEN Jielian,XIAO Rucheng.Ultimate bearing capacity analysis of concrete filledsteel tubular arch bridges[J].Central South HighwayEngineering,2004,29(4):24-28.
[12]Pacific Earthquake Engineering Research Center.PEER strong motion database[EB/OL].2008[2010-10-20].http://peer.berkeley.edu/smcat.
[13]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,2005,25(2):119-124.YANG Dixiong,LI Gang,CHENG Gengdong.Seismicanalysis of base-isolated structures subjected to near-fault pulse-like ground motions[J].EarthquakeEngineering and Engineering Vibration,2005,25(2):119-124.
[14]熊峰.钢管混凝土拱桥的抗震性能研究[D].成都:四川大学水利水电学院,2001.
[15]邢帆,祝兵.近断层地震动对大跨钢管拱桥作用指标研究[J].重庆交通大学学报:自然科学版,2011,30(2):11-19.XING Fan,ZHU Bing.Seismic action assessmentindicator of near-fault ground motion for long-spanCFST arch bridge[J].Journal of Chongqing JiaotongUniversity:Natural Science,2011,30(2):11-19.
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