SV波入射下峡谷地形对多支撑大跨桥梁地震反应影响分析
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摘要
以二维河谷地形在SV波垂直入射和斜入射下的结果作为地震动输入,分析了地形因素导致的地震动差异对一座桥墩高差悬殊的连续刚构桥地震反应的影响,并与一致激励下的结果进行了对比。结果表明:与一致激励相比,考虑地形效应的多点激励作用下,刚构桥地震反应存在显著差异,难以找到规律性,不同的结构部位其最大内力的表现各不一样;多点激励使主梁遭受不利反应;斜入射对低墩和主梁有显著影响,使其内力显著增加或使结构各部位内力分布明显不均衡;与低墩相比,高柔的桥墩对多点激励相对不敏感;大跨度桥梁抗震分析与设计应考虑局部场地和入射波的入射方向和角度的影响。
The seismic response of a reinforced concrete continuous rigid frame bridge is analyzed considering the scattering of SV seismic waves by canyon topography.The differences of structural responses between uniform and nonuniform seismic excitation cases are revealed.The results indicate that the canyon topography has significant and complex effects on the seismic response of the bridge.Different structural members suffer critical responses in different analysis cases.The low piers and rigid frames are more sensitive to the nonuniform ground motions obtained from the seismic response analysis of canyon topography in the case of oblique incidence of SV waves;otherwise the flexible high piers are insensitive.Canyon topography effects as well as the incidence angle of the waves should be regarded as important factors taken into account in aseismic design.
The seismic response of a reinforced concrete continuous rigid frame bridge is analyzed considering the scattering of SV seismic waves by canyon topography.The differences of structural responses between uniform and nonuniform seismic excitation cases are revealed.The results indicate that the canyon topography has significant and complex effects on the seismic response of the bridge.Different structural members suffer critical responses in different analysis cases.The low piers and rigid frames are more sensitive to the nonuniform ground motions obtained from the seismic response analysis of canyon topography in the case of oblique incidence of SV waves;otherwise the flexible high piers are insensitive.Canyon topography effects as well as the incidence angle of the waves should be regarded as important factors taken into account in aseismic design.
引文
[1]周国良.河谷地形对多支撑大跨桥梁地震反应影响[博士学位论文[D].哈尔滨:中国地震局工程力学研究所,2010.
[2]周国良,崔成臣,刘必灯,等.汶川8.0级地震中几座近断层桥梁失效模式的初步探讨[J].震灾防御技术,2008,3(4):370-378.ZHOU Guo-liang,CUI Cheng-chen,LIU Bi-deng,et al.Failure modes of near-fault bridges in Wenchuan Earthquake[J].Technology for Earthquake Disasters Prevention,2008,3(4):370-378.
[3]刘洪兵,范立础.大跨桥梁考虑地形及多点激励的地震响应分析[J].同济大学学报,2003,31(6):641-646.LIU Hong-bing,FAN Li-chu.Seismic analysis of long span bridges considering topographic effects and multi-supported excitations[J].Journal of Tongji University,2003,31(6):641-646.
[4]王蕾,赵成刚,屈铁军.SV波入射下地形条件对大跨刚构桥地震响应的影响[J].地震学报,2008,30(3):307-314.WANG Lei,ZHAO Cheng-gang,QU Tie-jun.Seismic response of long-span rigid framed bridge to incident SV wave with topographic effect being considered[J].Acta Seismologica Sinica,2008,30(3):307-314.
[5]ANASTASIOS G S,ANDREAS J K,KYRIAZIS.Inelastic dynamic analysis of RC bridge accounting for spatial variability of ground motion,site effects and soil-structure interaction phenomena,part 2:Parametric study[J].Earthquake Engineering and Structural Dynamics,2003,32(4):629-652.
[6]LEGER P,IDE I M,PAULTRE P.Multiple support seismic analysis of large structures[J].Computers&Structures,1990,36(6):1153-1158.
[7]王田友,丁洁民,楼梦麟,等.地铁运行所致建筑物振动的传播规律的影响[J].土木工程学报,2009,42(5):33-39.WANG Tian-you,DING Jie-min,LOU Meng-lin,et al.Subway-induced building vibration and its propagation[J].China Civil Engineering Journal,2009,42(5):2009,33-39.
[8]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下的地震反应分析[J].土木工程学报,2008,41(2):35-41.YANG Qing-shan,LIU Wen-hua,TIAN Yu-ji.Response analysis of national stadium under specially variable earthquake ground motions[J].China Civil Engineering Journal,2008,41(2):35-41.
[9]谢开仲,秦荣,林海瑛.大跨度CFST拱桥地震反应分析方法研究[J].武汉理工大学学报(交通科学与工程),2005,29(5):700-703.XIE Kai-zhong,QIN Rong,LIN Hai-ying.On methods of seismic response analysis of long-span CFST arch bridge[J].Journal of Wuhan University of Technology(Transportation Science&Engineering),2005,29(5):700-703.
[10]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报(自然科学版),2008,28(1):72-76.HUANG Xiao-guo,HU Da-lin,ZHANG Hou-ju.Effects of traveling wave to seismic response long span rigid-framed bridge[J].Journal of Chang'an University(Natural Science Edition),2008,28(1):72-76.
[11]周国良,李小军,刘必灯,等.大质量法在多点激励分析中的应用\误差分析与改进[J].工程力学,2011,28(1):48-54.ZHOU Guo-liang,LI Xiao-jun,LIU Bi-deng,et al.Error analysis and improvements of large mass method used in multi-support seismic excitation analysis[J].Engineering Mechanics,2011,28(1):48-54.
[12]周国良,李小军,喻畑,等.结构地震作用的基底激励模型及其适用性[J].建筑结构学报,2010,31(增刊2):82-88.ZHOU Guo-liang,LI Xiao-jun,YU Tian,et al.Applicability research on base excitation models used in structural seismic response analysis[J].Journal of Building Structures,2010,31(Supp.2):82-88.
[13]周国良,李小军,侯春林,等.SV波入射下河谷地形地震动特征分析[J].岩土力学,2012,33(4):1185-1190.ZHOU Guo-liang,LI Xiao-jun,Hou Chun-lin,et al.Characteristic analysis of surface ground motions of canyon topography under incident SV seismic waves[J].Rock and Soil Mechanics,2012,33(4):1185-1190.
[2]周国良,崔成臣,刘必灯,等.汶川8.0级地震中几座近断层桥梁失效模式的初步探讨[J].震灾防御技术,2008,3(4):370-378.ZHOU Guo-liang,CUI Cheng-chen,LIU Bi-deng,et al.Failure modes of near-fault bridges in Wenchuan Earthquake[J].Technology for Earthquake Disasters Prevention,2008,3(4):370-378.
[3]刘洪兵,范立础.大跨桥梁考虑地形及多点激励的地震响应分析[J].同济大学学报,2003,31(6):641-646.LIU Hong-bing,FAN Li-chu.Seismic analysis of long span bridges considering topographic effects and multi-supported excitations[J].Journal of Tongji University,2003,31(6):641-646.
[4]王蕾,赵成刚,屈铁军.SV波入射下地形条件对大跨刚构桥地震响应的影响[J].地震学报,2008,30(3):307-314.WANG Lei,ZHAO Cheng-gang,QU Tie-jun.Seismic response of long-span rigid framed bridge to incident SV wave with topographic effect being considered[J].Acta Seismologica Sinica,2008,30(3):307-314.
[5]ANASTASIOS G S,ANDREAS J K,KYRIAZIS.Inelastic dynamic analysis of RC bridge accounting for spatial variability of ground motion,site effects and soil-structure interaction phenomena,part 2:Parametric study[J].Earthquake Engineering and Structural Dynamics,2003,32(4):629-652.
[6]LEGER P,IDE I M,PAULTRE P.Multiple support seismic analysis of large structures[J].Computers&Structures,1990,36(6):1153-1158.
[7]王田友,丁洁民,楼梦麟,等.地铁运行所致建筑物振动的传播规律的影响[J].土木工程学报,2009,42(5):33-39.WANG Tian-you,DING Jie-min,LOU Meng-lin,et al.Subway-induced building vibration and its propagation[J].China Civil Engineering Journal,2009,42(5):2009,33-39.
[8]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下的地震反应分析[J].土木工程学报,2008,41(2):35-41.YANG Qing-shan,LIU Wen-hua,TIAN Yu-ji.Response analysis of national stadium under specially variable earthquake ground motions[J].China Civil Engineering Journal,2008,41(2):35-41.
[9]谢开仲,秦荣,林海瑛.大跨度CFST拱桥地震反应分析方法研究[J].武汉理工大学学报(交通科学与工程),2005,29(5):700-703.XIE Kai-zhong,QIN Rong,LIN Hai-ying.On methods of seismic response analysis of long-span CFST arch bridge[J].Journal of Wuhan University of Technology(Transportation Science&Engineering),2005,29(5):700-703.
[10]黄小国,胡大琳,张后举.行波效应对大跨度连续刚构桥地震反应的影响[J].长安大学学报(自然科学版),2008,28(1):72-76.HUANG Xiao-guo,HU Da-lin,ZHANG Hou-ju.Effects of traveling wave to seismic response long span rigid-framed bridge[J].Journal of Chang'an University(Natural Science Edition),2008,28(1):72-76.
[11]周国良,李小军,刘必灯,等.大质量法在多点激励分析中的应用\误差分析与改进[J].工程力学,2011,28(1):48-54.ZHOU Guo-liang,LI Xiao-jun,LIU Bi-deng,et al.Error analysis and improvements of large mass method used in multi-support seismic excitation analysis[J].Engineering Mechanics,2011,28(1):48-54.
[12]周国良,李小军,喻畑,等.结构地震作用的基底激励模型及其适用性[J].建筑结构学报,2010,31(增刊2):82-88.ZHOU Guo-liang,LI Xiao-jun,YU Tian,et al.Applicability research on base excitation models used in structural seismic response analysis[J].Journal of Building Structures,2010,31(Supp.2):82-88.
[13]周国良,李小军,侯春林,等.SV波入射下河谷地形地震动特征分析[J].岩土力学,2012,33(4):1185-1190.ZHOU Guo-liang,LI Xiao-jun,Hou Chun-lin,et al.Characteristic analysis of surface ground motions of canyon topography under incident SV seismic waves[J].Rock and Soil Mechanics,2012,33(4):1185-1190.
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