高架桥-地铁站-桩-土复杂结构体系地震反应分析
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摘要
基于ANSYS对机场航站区高架桥与其下通过的地铁车站的交叉处结构进行了地震反应分析研究,建立了高架桥-地铁站-桩-土相互作用复杂结构体系的计算模型,同时与桥墩墩底简化为固定端模型单独来分析计算上部桥体以及取消地铁结构替换为承台和桩基础的整体模型进行了地震时程反应对比分析。结果表明:考虑相互作用后,整体结构的动力特性与刚性地基假定下的结果存在较明显的差异,不但体系的自振周期增大,并且前几阶主要振型也有很大改变;整体结构的最大位移增大,但顺桥向与横桥向增大幅度明显不同;而对于最大位移节点的加速度、桥梁支座及桥墩墩底反力,三者的顺桥向与横桥向的差别更加明显,其顺桥向比固定端模型减小,而横桥向出现增大的情况。这些现象表明:对复杂结构体系进行抗震设计分析时,考虑土-结构动力相互作用带来的影响十分必要。
Based on ANSYS,a whole complex junction structure system between an airport viaduct project and a subway station was mainly analyzed.The complex structure model considering viaduct-subway station-pile-soil interactions was established and calculated by using an earthquake response analysis process.Also the conventional rigid foundation method and the whole model without subway station were contrast analyzed.The analysis results show that: due to the influence of PSSI(Pile-Soil and Structure Interactions),the overall structure dynamic properties have clear differences with the conventional rigid foundation model,the system natural vibration period increases,and first few main vibration modes have great changes.The bridge maximum displacement is raised,but the displacement changes of the longitudinal and transverse direction have differences.To the acceleration of the maximum displacement node,the bearing and the pier reaction,the longitudinal differences are more apparent than the transverse ones.Comparing the conventional rigid foundation method model,the longitudinal direction changes reduce above three items,but increase in the transverse direction.Therefore,when the whole complex structure system is analyzed,the dynamic analysis of considering PSSI is very necessary.
Based on ANSYS,a whole complex junction structure system between an airport viaduct project and a subway station was mainly analyzed.The complex structure model considering viaduct-subway station-pile-soil interactions was established and calculated by using an earthquake response analysis process.Also the conventional rigid foundation method and the whole model without subway station were contrast analyzed.The analysis results show that: due to the influence of PSSI(Pile-Soil and Structure Interactions),the overall structure dynamic properties have clear differences with the conventional rigid foundation model,the system natural vibration period increases,and first few main vibration modes have great changes.The bridge maximum displacement is raised,but the displacement changes of the longitudinal and transverse direction have differences.To the acceleration of the maximum displacement node,the bearing and the pier reaction,the longitudinal differences are more apparent than the transverse ones.Comparing the conventional rigid foundation method model,the longitudinal direction changes reduce above three items,but increase in the transverse direction.Therefore,when the whole complex structure system is analyzed,the dynamic analysis of considering PSSI is very necessary.
引文
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[5]朱东生,虞庐松,刘世忠.不规则桥梁地震动输入主方向的研究[J].兰州铁道学院学报(自然科学版),2000,19(6):37―40.Zhu Dongsheng,Yu Lusong,Liu Shizhong.The study ofearthquake input principal direction for irregular bridges[J].Journal of Lanzhou Railway University(NaturalSciences),2000,19(6):37―40.(in Chinese)
[6]尚守平,朱志辉,涂文戈.土-箱形基础-结构动力相互作用的模态试验分析[J].湖南大学学报(自然科学版),2004,31(5):71―76.Shang Shouping,Zhu Zhihui,Tu Wen’ge.Modalexperiment analysis for soil box foundation dynamicinteraction system[J].Journal of Hunan University(Natural Sciences),2004,31(5):71―76.(in Chinese)
[7]Stewart J P,Fenves G L.System identification forevaluating soil structure interaction effects in buildingsfrom strong motion recordings[J].EarthquakeEngineering and Structural Dynamics,1998,27(8):869―885.
[8]王占飞,隋伟宁,吴权.E2地震作用下部分填充钢管混凝土桥墩非线性时程分析及抗震性能评价[J].工程力学,2011,28(增刊I):189―194.Wang Zhanfei,Sui Weining,Wu Quan.Nonlineartime-history analysis and verification for seismicperformance of partially concrete-filled steel bridge pierunder E2 earthquake motion[J].Engineering Mechanics,2011,28(Suppl I):189―194.(in Chinese)
[9]Li Haishan,Ding Yang.Application of 3D time domainmethod for seismic soil structure interaction analysis ofspatial grid structure[J].Advanced Materials Research,2012,383/384/385/386/387/388/389/390:3713―3718.
[10]Toyoaki Nogami.Simplified subgrade model forthree-dimensional soil foundation interaction analysis[J].Soil Dynamics and Earthquake Engineering,1996,15(7):419―429.
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