地震波斜入射下考虑局部地形影响和土结动力相互作用的多跨桥动力响应分析
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摘要
在地震工程研究中同时考虑局部地形效应和土与结构动力相互作用对结构动力响应的影响是一个困难的问题。该文基于多源粘弹性人工边界理论,利用通用有限元程序ANSYS建立了一种可以同时考虑地震波入射角度、土与结构动力相互作用及局部地形效应等因素影响的有限元分析模型。利用这一模型对一座5跨连续梁桥进行了动力响应分析,结果表明:结构内力随着地震波入射角度的变化而变化;地形效应的影响使桥梁结构局部存在内力放大效应;不考虑土-结构动力相互作用有可能较小的估计结构的内力;同时土的物理性质对土-结构动力相互作用也有一定的影响。
The seismic response analysis of the structure considering both topographic effect and soil-structure dynamic interaction simultaneously is a difficult problem in earthquake engineering research.Based on the viscous-spring superposition artificial boundary theory,a finite element model accounting for the incident angle,soil-structure dynamic interaction and topographic effect is built by using the ANSYS and a seismic response analysis of a five-span continuous beam bridge was carried out by the method.The numerical results demonstrate that the internal force changes with the increasing of incidence degrees;the internal force is magnified in a certain site because of the local topographic effect;compared with considering the soil-structure dynamic interaction effect,the internal force is smaller without such effect;simultaneously,physical properties of soil play a certain role in analysis of soil-structure dynamic interaction effect.
The seismic response analysis of the structure considering both topographic effect and soil-structure dynamic interaction simultaneously is a difficult problem in earthquake engineering research.Based on the viscous-spring superposition artificial boundary theory,a finite element model accounting for the incident angle,soil-structure dynamic interaction and topographic effect is built by using the ANSYS and a seismic response analysis of a five-span continuous beam bridge was carried out by the method.The numerical results demonstrate that the internal force changes with the increasing of incidence degrees;the internal force is magnified in a certain site because of the local topographic effect;compared with considering the soil-structure dynamic interaction effect,the internal force is smaller without such effect;simultaneously,physical properties of soil play a certain role in analysis of soil-structure dynamic interaction effect.
引文
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[2]Wu Shiming,Gan Gang.Dynamic Soil structureinteraction for high-rise building[J].Developments inGeotechnical Engineering,1998,83:203―216.
[3]Wu Jingning.Seismic effectiveness of tuned massdampers considering soil-structure interaction[J].Earthquake Engineering and Structure Dynamic,1999,28(11):1219―1233.
[4]王蕾,赵成刚,王智峰.考虑地形影响和多点激励的大跨高墩桥地震响应分析[J].土木工程学报,2006,39(1):50―53.Wang Lei,Zhao Chenggang,Wang Zhifeng.Seismicresponse analysis of continuous rigid-framed bridge withhigh piers considering topographic effects andmulti-support excitations[J].China Civil EngineeringJournal,2006,39(1):50―53.(in Chinese)
[5]王蕾,赵成刚,屈铁军.SV波入射下地形条件对大跨钢构桥地震响应的影响[J].地震学报,2008,30(3):307―314.Wang Lei,Zhao Chenggang,Qu Tiejun.Seismicresponse of long-span rigid-framed bridge to incident SVwave with topographic effect being considered[J].ActaSeismol Ogica Sinica,2008,30(3):307―314.(inChinese)
[6]屈铁军,王前信.空间相关的多点地震动合成(Ⅱ):合成实例[J].地震工程与工程振动,1998,18(2):25―32.Qu Tiejun,Wang Qianxin.Simulation of spatalcorrelative time histories of multi-point ground motion,partⅡ:Application of fundamental formulas[J].Earthquake Engineering and Engineering Vibration,1998,18(2):25―32.(in Chinese)
[7]George D Bouckovalas,Achilleas G Papadimitriou.Numerical evaluation of slope topography effects onseismic ground motion[J].Soil Dynamics andEarthquake Engineering,2005,25:547―558.
[8]李山有,马强,韦庆海.地震体波斜入射下的断层台阶地震反应分析[J].地震研究,2005,28(3):277―281.Li Shanyou,Ma Qiang,Wei Qinghai.Seismic responseanalysis of fault step subjected to obliquely incident bodywave[J].Journal of Seismological Esearch,2005,28(3):277―281.(in Chinese)
[9]车伟,罗奇峰.复杂地形条件下地震波的传播研究[J].岩土工程学报,2008,30(9):1333―1337.Che Wei,Luo Qifeng.Seismic wave propagation incomplex topography[J].Chinese Journal of GeotechnicalEngineering,2008,30(9):1333―1337.(in Chinese)
[10]项海帆.斜张桥在行波作用下的地震反应[J].同济大学学报,1983(3):1―9.Xian Haifan.Earthquake response analysis ofcable-Stayed bridges under the action of travelling waves[J].Journal of Tongji University,1983(2):1―9.(inChinese)
[11]Nazmy A S,Abdel-Ghffor A M.Effect of ground motionspatial variability on the response of cable-stayed bridges[J].EESD,1992,121:1―20.
[12]郜新军,赵成刚,张延.多源散射叠加粘弹性人工边界探究及在桥梁工程中的应用[J].土木工程学报,2010,43(11):131―138.Gao Xinjun,Zhao Chenggang,Zhang Yan.A study ofviscous-spring superposition artificial boundary formulti-sources scattering problem and its application inbridge engineering[J].China Civil Engineering Journal,2010,43(11):131―138.(in Chinese)
[13]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55―64.Liu Jingbo,Lu Yandong.A direct method for analysis ofdynamic soil-structure interaction[J].China CivilEngineering Journal,1998,31(3):55―64.(in Chinese)
[14]杜修力.工程波动理论与方法[M].北京:科学出版社,2009.Du Xiuli.Theories and methods of wave motion forengineering[M].Beijing:Science Press,2009.(inChinese)
[15]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.Chen Guoxin.Geotechnical earthquake engineering[M].Beijing:Science Press,2007.(in Chinese)
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