框架结构逐层加载的基础沉降数值研究

Numerical research on foundation settlement of frame structure loaded floor by floor

应用ANSYS程序建立了框架结构-独立基础-地基共同作用的数值模型,并借助其单元生死功能实现逐层加载。通过研究发现,逐层加载和一次加载对基础最终沉降量影响不大;基础沉降曲线并不随施工层数的增加而线性增长,而是当增加到一定层数时才表现出明显的非线性,且层数越多,非线性关系越明显;进而提出了基础沉降值非线性累积与相邻基础间沉降差非线性累积的概念。为进一步研究基础沉降的非线性规律具有一定的指导意义。

Numerical model considering the interaction of structure, foundation and soil is established with ANSYS, whose function of element birth and death can be employed for loading floor by floor. Results indicate that two loading methods, which are loading floor by floor and loading one time, respectively, have little influence on ultimate settlement; settlement curve does not increase linearly with the floor number, and nonlinear relationship between the curve and the floor number will be obvious when the floor number up to certain value, more the floor numbers are, more obvious the nonlinear relation is. Then the concepts, which are the nonlinear accumulation of foundation settlement and the settlement discrepancy between adjacent foundations, are put forward. The achievements will contribute to the further study on nonlinear mechanics of foundation settlement, and provide theoretical guidance for design and construction of frame structure.