筏板基础沉降的有限元分析和简化计算

发布时间：2018-06-22 16:27

本文选题：筏板基础 + 沉降　；参考：《合肥工业大学》2017年硕士论文

【摘要】：随着城市的发展,高层建筑日益增多,独立基础已经不能满足高层建筑对地基承载力和稳定性的需求,而筏板基础凭借可以提高结构整体刚度、调节不均匀沉降、对地基承载力要求较低等优点,得到了广泛的应用。筏板基础的沉降问题也已经成为基础工程中的重要课题。与独立基础的沉降计算相比,关于筏板基础沉降计算的研究还不够成熟,沉降计算方法种类繁多、过程复杂,各方法计算结果相差甚远,而且目前为止,没有形成统一的规范。本文就主要研究筏板基础的沉降问题,并提出筏板基础沉降的简化计算方法,即如何将筏板基础沉降简化成独立基础沉降进行计算。基于前人对筏板基础的研究,本文通过大型有限元软件,依托实际工程案例,针对框架结构下的平板式筏板基础,建立多组有限元模型,对筏板基础沉降进行了一系列研究。首先建立合理的有限元模型,分析筏板基础沉降的影响因素,包括板厚、柱距、外荷载、压缩层厚度和筏板边缘外伸长度对筏板基础沉降的影响,为筏板基础的简化计算提供依据。然后,通过函数拟合的方法,找出了筏板基础沉降的简化计算条件,即柱距与柱轴力满足何种关系时,可以将筏板基础沉降问题简化成独立基础沉降进行计算。最后,运用量纲分析法推导出简化后独立基础尺寸的计算公式。
[Abstract]:With the development of the city and the increasing number of high-rise buildings, independent foundation can no longer meet the needs of foundation bearing capacity and stability of high-rise buildings. Raft foundation can improve the overall stiffness of the structure and adjust the uneven settlement. It has been widely used because of its low requirement for foundation bearing capacity. The settlement of raft foundation has also become an important subject in foundation engineering. Compared with the settlement calculation of independent foundation, the research on settlement calculation of raft foundation is not mature enough. There are many kinds of settlement calculation methods, the process is complicated, the results of each method are far from each other, and up to now, there is no uniform standard. In this paper, the settlement of raft foundation is mainly studied, and a simplified method for calculating the settlement of raft foundation is put forward, that is, how to simplify the settlement of raft foundation to the settlement of independent foundation. Based on the previous research on raft foundation, this paper, through large-scale finite element software, relying on practical engineering cases, establishes multi-group finite element model for flat raft foundation under frame structure, and carries out a series of research on raft foundation settlement. Firstly, a reasonable finite element model is established to analyze the influence factors of raft foundation settlement, including slab thickness, column spacing, external load, compression layer thickness and outer elongation of raft edge. It provides the basis for simplified calculation of raft foundation. Then, through the method of function fitting, we find out the simplified calculation condition of raft foundation settlement, that is, when the column distance and column axial force satisfy what kind of relation, we can simplify the raft foundation settlement problem into independent foundation settlement to calculate. Finally, the dimensionality analysis method is used to deduce the calculation formula of the size of the simplified independent foundation.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU433

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