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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。
Based on multi-source superimposed viscoelastic artificial boundary and equivalent linearization theory, a dynamic response analysis and calculation method for long-span structures considering the nonlinearity of site, topography and soil-structure dynamic interaction is established. In this paper, the free-field equivalent linearization method of nonlinear SV field with oblique incidence is given. Then the finite element model of a 5-span continuous rigid frame bridge and site is established by using ANSYS finite element software. Dynamic Response of Continuous Rigid Frame Bridges under Nonlinear Incident with Different Incidence Angle, Terrain and Different Site Stiffness. The calculation results show that the axial force of bridge pier increases with the incident angle and the shear force decreases with the increase of incident angle. The effect of local irregularity on the internal force amplification of bridge is different. The stronger the effect of amplification is, the more the stiffness of soil affects the dynamic response of the bridge structure considering the soil-structure dynamic interaction. The softer the soil, the more obvious the soil-structure dynamic interaction is.