地震波斜入射下考虑场地非线性、地形效应和土结动力相互作用的大跨连续刚构桥地震响应分析

发布时间：2018-05-10 17:31

本文选题：地震响应分析 + 斜入射　；参考：《工程力学》2017年04期

【摘要】：基于多源叠加粘弹性人工边界和等效线性化理论,建立了SV波斜入射下考虑场地非线性、地形效应和土-结构动力相互作用的大跨结构动力响应分析计算方法。该文首先给出了SV波斜入射下非线性场地的自由场等效线性化求解方法,然后利用ANSYS有限元软件对一座5跨连续刚构桥和场地建立了有限元模型,计算了考虑场地非线性情况下不同入射角、不同地形和不同场地刚度工况下连续刚构桥的动力响应。计算结果表明:桥墩轴力随着入射角的增大而增大,剪力则随着入射角的增大而减小;局部地形不规则程度对桥梁结构内力放大效应有所不同,地形变化越剧烈,放大效应越明显;土体刚度对考虑土-结构动力相互作用的桥梁结构动力响应有较大影响,土体越软,土-结构动力相互作用效应越明显。
[Abstract]:Based on the multi-source superposition of viscoelastic artificial boundary and equivalent linearization theory, a method for analyzing the dynamic response of long-span structures considering site nonlinearity, topographic effect and soil-structure dynamic interaction under oblique incidence of SV waves is established. In this paper, the equivalent linearization method of free field for a nonlinear site under oblique incidence of SV waves is presented, and then a finite element model for a 5-span continuous rigid frame bridge and site is established by using ANSYS finite element software. The dynamic responses of continuous rigid frame bridges with different incident angles, different terrain and different site stiffness were calculated. The results show that the axial force of pier increases with the increase of incident angle, and the shear force decreases with the increase of incident angle, and the effect of local topography irregularity on the internal force of bridge structure is different. The more obvious the amplification effect is, the greater the influence of soil stiffness on the dynamic response of bridge structure considering the soil-structure dynamic interaction. The softer the soil, the more obvious the soil-structure dynamic interaction effect is.
【作者单位】：中国地震灾害防御中心;北京交通大学土建学院;桂林理工大学土木与建筑工程学院;
【基金】：国家973项目(2015CB0578000) 国家自然科学基金项目(51478135)
【分类号】：U442.55;U448.23

【相似文献】