混凝土多孔砖墙体结构检测及非线性有限元数值模拟
发布时间：2018-12-09 17:15
【摘要】：混凝土多孔砖作为一种新型砌块材料,具有强度高、自重轻、保护环境等优点,越来越多的应用于砌体结构承重墙。众所周知,砌体结构墙体裂缝是个不可避免的问题,这个问题一直困扰着广大研究人员。在这方面,传统砌体结构墙体裂缝的研究已相对成熟,对于使用混凝土多孔砖这种新型砌块材料的墙体的研究相对来说还处于探索阶段。为此,本文采用有限元分析方法,运用ANSYS大型通用有限元软件对混凝土多孔砖墙体在静荷载作用下的开裂问题进行数值模拟分析。本文首先介绍了国内外有关砌体结构裂缝的研究概况,以及有限元模拟有关的文献,借鉴数值模拟方面的经验。阐述砌体结构裂缝类型和成因,其中包含由荷载产生裂缝的原因。其次对一栋采用混凝土多孔砖墙体的多层砌体结构进行现场检测,获得第一手的检测数据。该混凝土多孔砖墙体为无配筋结构,局部出现斜裂缝。运用回弹法检测多孔砖和砌筑砂浆的强度,发现该墙体砌筑砂浆强度极低,基本没强度,初步分析墙体出现裂缝跟此有极大关系。最后对检测中出现裂缝的混凝土多孔砖墙体进行有限元数值模拟,从砂浆强度和砌块强度对墙体开裂荷载的影响进行模拟,通过对模拟结果的分析得出砌筑砂浆强度过低容易导致墙体开裂,并且多孔砖强度对墙体开裂的影响更明显,我们可以从提高砌块强度方面入手来加强现代砌体结构的质量。
[Abstract]:As a new type of block material, concrete porous brick has many advantages, such as high strength, light weight and environmental protection. It is more and more used in the bearing wall of masonry structure. As we all know, the wall crack of masonry structure is an inevitable problem, this problem has been puzzling the vast number of researchers. In this respect, the research on the wall cracks of traditional masonry structure has been relatively mature, and the research on the wall with concrete porous brick, a new type of block material, is still relatively in the exploratory stage. In this paper, the finite element analysis method is used to simulate the cracking problem of concrete porous brick wall under static load by using ANSYS software. This paper first introduces the research situation of masonry structure crack at home and abroad, and the literature about finite element simulation, and draws lessons from the experience of numerical simulation. This paper describes the types and causes of cracks in masonry structures, including the causes of cracks caused by loads. Secondly, a multi-story masonry structure with concrete porous brick wall is tested on the spot, and the first-hand test data are obtained. The concrete porous brick wall is a non-reinforced structure with partial oblique cracks. The strength of porous brick and masonry mortar is tested by rebound method. It is found that the strength of masonry mortar of this wall is extremely low and basically no strength. The initial analysis of cracks in the wall is closely related to this. Finally, the finite element numerical simulation of the concrete porous brick wall with cracks is carried out, and the influence of mortar strength and block strength on the cracking load of the wall is simulated. Through the analysis of simulation results, it is concluded that too low strength of masonry mortar can easily lead to wall cracking, and the influence of the strength of porous brick on wall cracking is more obvious. We can enhance the quality of modern masonry structure by improving the strength of masonry block.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364;TU522.3
本文编号：2369748
[Abstract]:As a new type of block material, concrete porous brick has many advantages, such as high strength, light weight and environmental protection. It is more and more used in the bearing wall of masonry structure. As we all know, the wall crack of masonry structure is an inevitable problem, this problem has been puzzling the vast number of researchers. In this respect, the research on the wall cracks of traditional masonry structure has been relatively mature, and the research on the wall with concrete porous brick, a new type of block material, is still relatively in the exploratory stage. In this paper, the finite element analysis method is used to simulate the cracking problem of concrete porous brick wall under static load by using ANSYS software. This paper first introduces the research situation of masonry structure crack at home and abroad, and the literature about finite element simulation, and draws lessons from the experience of numerical simulation. This paper describes the types and causes of cracks in masonry structures, including the causes of cracks caused by loads. Secondly, a multi-story masonry structure with concrete porous brick wall is tested on the spot, and the first-hand test data are obtained. The concrete porous brick wall is a non-reinforced structure with partial oblique cracks. The strength of porous brick and masonry mortar is tested by rebound method. It is found that the strength of masonry mortar of this wall is extremely low and basically no strength. The initial analysis of cracks in the wall is closely related to this. Finally, the finite element numerical simulation of the concrete porous brick wall with cracks is carried out, and the influence of mortar strength and block strength on the cracking load of the wall is simulated. Through the analysis of simulation results, it is concluded that too low strength of masonry mortar can easily lead to wall cracking, and the influence of the strength of porous brick on wall cracking is more obvious. We can enhance the quality of modern masonry structure by improving the strength of masonry block.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364;TU522.3
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