考虑土-结构相互作用的浅基础在缓慢循环荷载作用下摇摆的数值模拟
Numerical modeling of rocking of shallow foundations subjected to slow cyclic loading with consideration of soil-structure interaction
摘要：
建筑物在地震或风荷载作用下的强烈振动可能会导致地基从下方土壤中隆起或部分分离。迄今为止，各种研究表明，土-结构相互作用（SSI）具有许多有利的特性，包括可能增加土-结构系统的自振周期，以及减少结构中的剪切基底需求。此外，摇摆是描述浅基础上特别是软土地基上建筑物的旋转行为的最重要因素之一，它可以显着影响结构的动力性能。为研究考虑土-结构相互作用的浅基础在缓慢循环荷载作用下的摇摆效应，采用有限元软件ABAQUS对浅基础的摇摆运动进行了模拟。为了更有效地模拟土体，在分析中使用FORTRAN编写的子程序考虑了土体的线性和非线性弹塑性特性。研究结果表明，允许地基晃动会导致土-结构体系的刚度退化，土-结构体系的能量耗散增加，特别是在高层结构中。此外，结果表明，部署线性弹塑性方法可能会导致更高的隆起的基础相比，使用非线性弹塑性方法，特别是在结构与较低的高度。
英文摘要：
Strong Vibration of buildings during seismic or wind loading may result in an uplift or partial separation of the foundation from the underneath soil. To date, various researches have indicated that Soil-Structure Interaction (SSI) has many favorable features including a probable increase in natural period of the soil-structure system and also a decrease in shear base demand in structures. Furthermore, Rocking is one of the most important factors in describing the rotational behavior of a structure built on a shallow foundation especially on a soft soil which can affect the dynamic behavior of the structure noticeably. To study the effects of rocking of shallow foundations subjected to slow cyclic loading with consideration of soil-structure interaction, a Finite Element Method (FEM) using ABAQUS software has been deployed to simulate the rocking motion of shallow foundations. For a more efficient simulation of the soil, both linear and non-linear elasto-plastic behavior of the soil has been taken into account in the analysis using the sub-routine coded in FORTRAN. The results notably show that allowing the foundation to rock may result in stiffness degradation of the soil-structure system and an increase in energy dissipation of soil-structure, especially in high rise structures. Additionally, results describe that deploying the linear elastic-perfect plastic approach may result in higher uplift of the foundation in comparison to that using a non-linear elasto-plastic approach, particularly in structures with lower heights.
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