Rayleigh波作用下桩-土-桥梁结构动力相互作用问题研究  

A pile-soil-bridge structure with dynamic interaction under Rayleigh wave excitation

作　　者：谷音[1] 于志敏[1] 

机构地区：[1]福州大学土木工程学院,福州350108

出　　处：《振动与冲击》2011年第12期98-102,134,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助(51108088);福建省自然科学基金项目(2010J01287)

摘　　要：基于等效粘弹性人工边界单元建立了可考虑成层介质及Rayleigh波输入的二维有限元时域模型,计算了Rayleigh波作用下成层介质与均匀介质的自由场反应,与理论解比较表明有限元计算结果具有较好的工程精度。针对Rayleigh波作用下桩-土-典型刚构桥梁结构动力反应进行了分析,考虑了场地条件的不同、软夹层位置的改变、不同频率Rayleigh波的输入以及桩长对Rayleigh波传播与场地地震反应的影响,对影响因素进行了讨论。A 2D finite element model for a semi-infinite space with layered media and Rayleigh wave input was built by using equivalent viscous-elastic artificial boundary elements. The responses in free-field of even and layered media were computed. The results indicated that the finite element method has excellent estimation precision compared with the theore tical solutions. The dynamic response of a pile-soil-bridge structure with dynamic interaction under Rayleigh waves was analyzed. A typical rigid frame bridge was included in this case study. The influence of different site conditions, changes of location of soft interlayer, different Rayleigh wave input and pile length on Rayleigh wave propagation and the seismic response were considered. The influencing factors of the rigid frame bridge structure were also discussed.

关 键 词：RAYLEIGH波 桩-土-桥梁结构动力相互作用 人工边界单元 成层介质 参数分析 

分 类 号：O347[理学—固体力学] TU311.3[理学—力学]