外加鋼筋網(wǎng)水泥砂漿加固砌體結(jié)構(gòu)受力性能分析
[Abstract]:Masonry structure is widely used all over the world because of its advantages such as low cost, easy to use local materials, good fire resistance, good thermal insulation and easy operation. However, the integrity and bearing capacity of masonry structures, especially unreinforced masonry structures, are poor. When mortar strength is low and seismic structural measures are lacking, seismic performance is very poor. The ability of resisting earthquake action is weak, whether it can be used reasonably after earthquake damage, and whether it can meet the requirements of current code after seismic reinforcement is still to be studied. In our country, the brick masonry structure still occupies a large proportion, but the tensile strength, bending strength and shear strength of the brick masonry structure are all low, which can easily cause brittleness failure when subjected to earthquake load. The ductility and strength of brick masonry structure can be improved effectively by strengthening brick masonry with reinforced concrete mortar. Therefore, it is of great practical significance to study the seismic reinforcement of brick masonry structure strengthened with reinforced concrete mortar. In this paper, the reinforced concrete mortar is used to reinforce the unreinforced brick masonry structure, and the finite element software is used to simulate the masonry building before and after reinforcement. The mechanical behavior of the masonry building is studied and analyzed. The conclusions obtained can be used for theoretical reference in practical engineering. The main research work is as follows: 1. The finite element method is used to simulate the unreinforced masonry structure, and the mechanical behavior of the unreinforced masonry wall is analyzed from the side of the door and the side of the window, and the displacement-force skeleton diagram of the wall is obtained under different loads. This diagram can reflect the relationship between displacement and force. According to the Mises stress in the masonry model, the ultimate bearing capacity of unreinforced masonry wall is analyzed by four methods, namely, displacement monotone loading, displacement cyclic loading, monotone loading and periodic loading, and the damage location is judged. Extent and cracks in masonry structures. 2. Based on the established finite element model of a wall in a masonry structure with a structural column and a ring beam, the wall is subjected to horizontal displacement, horizontal force, Under the four loading modes of displacement periodic loading and periodic loading the mechanical behavior of wall with structural column-ring beam is studied and the relationship between displacement and load is analyzed. The influence of mortar strength, aspect ratio and vertical stress on ultimate bearing capacity of wall is studied. The finite element model of unreinforced brick wall with reinforced concrete mortar was established, and the stress-strain distribution of the model before and after reinforcement was calculated and compared, and the thickness of reinforced mortar, the spacing of reinforcing bar and the strength of masonry mortar were analyzed. The influence of aspect ratio and vertical compressive stress on the bearing capacity of masonry structure is presented.
【學(xué)位授予單位】:北方工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU364
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