砌体结构墙体在日照和季节温差作用下应力分布研究

发布时间：2018-10-18 12:29

【摘要】：本文从砌体结构工程裂缝基本概念出发,研究国内外温度裂缝的控制措施,指出国内外规范在裂缝的控制措施方面的异同。同时,对砌体结构墙体温度裂缝进行详细分类,并分析各类裂缝形成原因。利用有限元分析软件ANSYS,以一四层简化模型对砌体结构在日照温差和季节性温差工况下的温度应力进行非线性有限元分析,其中日照温差考虑太阳辐射,季节性温差以均匀温度定义并考虑混凝土的徐变效应。两种工况分析时,每层选取开窗外墙、不开窗外墙、开洞内墙和不开洞内墙,其中对外墙的内外表面分别提取数据,得出如下结论:虽然两种工况温度取值不同,热分析方式不同,但是其应力分布规律基本相同;应力在高度方向,顶层墙体应力大于中间两层,中间两层应力值基本相同;应力在墙体宽度方向上,两端头应力值大,中间应力值小;单片墙体应力上部应力大,下部应力较小;各外墙,无论是否开窗,内外表面应力变化规律都相同,且墙体应力在各楼层分布规律都一样;开窗外墙在内外墙相交处应力大于靠窗一侧应力;各内墙,无论是否开洞口,两表面应力值都基本相同,应力变化规律也基本相同,其中内墙与外墙相交处应力值最大。最后根据应力分布规律和工程实践经验,提出了设计和施工阶段控制温度裂缝的措施。
[Abstract]:Starting from the basic concept of cracks in masonry structure engineering, this paper studies the control measures of temperature cracks at home and abroad, and points out the similarities and differences in the control measures of cracks in the codes at home and abroad. At the same time, the temperature cracks of masonry structure wall are classified in detail, and the causes of these cracks are analyzed. The nonlinear finite element analysis of the temperature stress of masonry structure under the condition of sunshine temperature difference and seasonal temperature difference is carried out by using the finite element analysis software ANSYS, with a simplified model of one or four stories, in which solar radiation is taken into account in the sunshine temperature difference. Seasonal temperature difference is defined as uniform temperature and creep effect of concrete is considered. In the analysis of two kinds of working conditions, each layer selects the windowed wall, not the wall outside the window, the inner wall of the hole and the inner wall of the hole, in which the data are extracted from the inside and outside surface of the external wall, and the conclusions are as follows: although the temperature values of the two working conditions are different, The stress of the top wall is larger than that of the middle layer, and the stress value of the middle layer is basically the same, the stress is in the direction of the width of the wall, and the stress value of the two ends of the wall is large. The middle stress value is small; the stress of the upper part of the monolithic wall is large and the stress of the lower part is small; the stress of the outer wall is the same whether or not it is windowed, and the stress distribution of the wall is the same in each floor. The stress of the windowed exterior wall is greater than that of the side of the window at the intersection of the interior wall and the external wall, and the stress values of the two surfaces are basically the same, and the law of stress variation is basically the same, in which the stress value at the intersection between the inner wall and the external wall is the largest. Finally, according to the stress distribution law and engineering practice experience, the measures of controlling temperature crack in design and construction stage are put forward.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU364

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