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 f＇n＇st 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.
出处
《工程力学》
EI
CSCD
北大核心
2013年第B06期53-58,共6页
Engineering Mechanics
基金
国家自然科学基金项目(51178308
51278335)
关键词
结构工程
抗震分析
有限元方法
曲线桥梁
地下结构
活动盆式支座
structural engineering
seismic analysis
finite element method
curved bridges
undergroundstructure
activities tub bearing
