底框—砌体结构底层刚度调整对基础不均匀沉降影响的数值分析

发布时间：2018-01-04 13:19

本文关键词：底框—砌体结构底层刚度调整对基础不均匀沉降影响的数值分析　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：建筑物的不均匀沉降与安全密切相关,是导致工程事故的重要原因之一。建筑物一旦发生不均匀沉降轻则造成房屋倾斜、墙体开裂,重则造成房屋倒塌,尤其是对结构材料的抗弯、抗剪能力差、对不均匀沉降敏感性较高的底框结构房屋影响更为严重。而底框结构是现阶段特定经济条件下产生的一种满足人们需要的房屋结构形式,在大小城市已广泛存在,因此如何降低或避免不均匀沉降对底框结构房屋的危害并将房屋恢复到正常使用状态具有重要研究价值。本文以此为出发点,首先总结了地基不均匀沉降的类型；分析不均匀沉降引起的危害；归纳目前引起不均匀沉降产生的原因及预防的方法；提出不均匀沉降事故处理的方法。接着本文介绍底框结构模型采用的单元、材料模型、本构关系曲线、材料参数的选取以及非线性收敛准则、网格划分的原则等,并对本文所用到的有限元单元及材料模型的适用范围进行了介绍。本文重点是通过有限元软件ANSYS建立了一个底框结构的模型,分别分析了底层框架柱尺寸的改变及框架柱间洞口填充对基础不均匀沉降的影响,均考虑了中部沉降大和端部沉降大两种情况。分析结果表明,两种沉降形式下,提高柱截面尺寸可改善地基的不均匀沉降,且与同时增加边柱、中柱截面尺寸相比单独增加沉降较小的柱截面尺寸效果较好；全洞口填充及提高填充墙厚度也可降低中柱与边柱之间的沉降差,但中柱沉降大时两边洞口填充效果较好,边柱沉降大时全洞口填充效果较好。本文的最后介绍了一个中部沉降大于端部沉降的底框结构不均匀沉降事故的处理案例。通过现场的勘测调查以及后期数据的处理,分析出了该事故产生的真正原因,介绍了其加固处理的方法,并详细介绍了底框部分结构刚度以及基础加强加固在该事故加固工程中的应用,为处理同类事故提供借签依据。
[Abstract]:The uneven settlement of buildings is closely related to safety, which is one of the important causes of engineering accidents. Once the uneven settlement occurs, the buildings will be inclined, the walls will crack, and the buildings will collapse. Especially, the flexural and shear resistance of structural materials is poor. The bottom frame structure, which is more sensitive to uneven settlement, has a more serious impact on the housing structure, and the bottom frame structure is a kind of housing structure which meets the needs of the people under the specific economic conditions at the present stage. Because of the widespread existence in large and small cities, how to reduce or avoid the harm of uneven settlement to the housing with bottom frame structure and restore the building to the normal use state has important research value, this paper takes this as the starting point. Firstly, the types of uneven settlement of foundation are summarized. The harm caused by uneven settlement is analyzed. The causes and prevention methods of uneven settlement are summarized. Then this paper introduces the element, material model, constitutive relation curve, material parameter selection and nonlinear convergence criterion of the bottom frame structure model. The principle of meshing and so on, and the application scope of finite element element and material model used in this paper are introduced. The emphasis of this paper is to establish a model of bottom frame structure by finite element software ANSYS. The size change of the bottom frame column and the influence of the hole filling between the frame columns on the uneven settlement of the foundation are analyzed respectively. The large settlement in the middle part and the large settlement at the end are considered. The results show that. Under the two types of settlement, increasing the section size of the column can improve the uneven settlement of the foundation, and compared with the increase of the side column at the same time, the effect of increasing the section size of the middle column is better than that of the column with smaller settlement. Full hole filling and increasing the thickness of filling wall can also reduce the settlement difference between the middle column and the side column, but when the settlement of the middle column is large, the filling effect of both sides of the hole is better. When the side column settlement is large, the filling effect of the whole hole is better. At the end of this paper, a case of the uneven settlement of the bottom frame structure in which the central settlement is greater than the end settlement is introduced. Handle it. The real cause of the accident is analyzed and the method of reinforcement is introduced. The stiffness of the bottom frame and the application of foundation reinforcement in the reinforcement of the accident are introduced in detail. To provide the basis for handling similar accidents.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU433

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