【摘要】：砌體結(jié)構(gòu)因造價(jià)比較低廉、容易就地取材、耐火性比較好、良好的保溫隔熱性能以及施工操作簡(jiǎn)便等優(yōu)點(diǎn),普遍應(yīng)用于世界各國。但砌體結(jié)構(gòu)尤其是無筋砌體結(jié)構(gòu)的完整性較差,承載力比較低。當(dāng)砂漿強(qiáng)度低、抗震構(gòu)造措施欠缺時(shí),抗震性能很差。抵抗地震作用的能力薄弱,震損后是否能夠合理利用,進(jìn)行抗震加固后能否滿足現(xiàn)行規(guī)范的要求,還有待于研究。在我國房屋建筑中,磚砌體結(jié)構(gòu)仍占有較大的比例,只是磚砌體結(jié)構(gòu)的抗拉、抗彎及抗剪強(qiáng)度均較低,在遭受地震荷載作用時(shí)極易造成脆性破壞。采用鋼筋網(wǎng)水泥砂漿面層加固磚砌體可以有效提高磚砌體結(jié)構(gòu)的延性和強(qiáng)度。為此,研究鋼筋網(wǎng)水泥砂漿加固磚砌體結(jié)構(gòu)的抗震加固問題具有重要的實(shí)際意義。本文采用外加鋼筋網(wǎng)水泥砂漿加固無筋磚砌體結(jié)構(gòu),使用有限元軟件數(shù)值模擬加固前后的砌體房屋,對(duì)其受力性能進(jìn)行研究和分析,獲得的結(jié)論可供實(shí)際工程做理論參考。主要研究工作如下:1.運(yùn)用有限元方法對(duì)無筋砌體結(jié)構(gòu)進(jìn)行了數(shù)值模擬,并從開門一側(cè)和開窗一側(cè)分析無筋砌體墻體受力性能,得到了其在不同荷載作用下位移-力骨架曲線圖,此圖能反映位移和力的變化關(guān)系。根據(jù)砌體模型中的Mises應(yīng)力,從加載方案-位移單調(diào)加載、位移周期加載、單調(diào)加載和周期加載四種方法分析無筋砌體墻體極限承載力,判斷損傷位置、程度以及砌體結(jié)構(gòu)裂縫。2.基于建立的帶構(gòu)造柱-圈梁的砌體結(jié)構(gòu)中一片墻體的有限元模型,在承受水平位移、水平力、位移周期加載和周期加載這四種加載方式下研究帶構(gòu)造柱-圈梁的墻體的受力性能,并分析位移和荷載的關(guān)系。研究不同等級(jí)的砂漿強(qiáng)度、高寬比和豎向應(yīng)力對(duì)墻體極限承載力的影響。3.建立外加鋼筋網(wǎng)水泥砂漿的無筋磚墻體有限元模型,計(jì)算并對(duì)比墻體加固前后在水平荷載下模型的應(yīng)力-應(yīng)變分布規(guī)律,分析加固層砂漿厚度、鋼筋網(wǎng)間距、砌筑砂漿強(qiáng)度、高寬比及豎向壓應(yīng)力等對(duì)砌體結(jié)構(gòu)承載力的影響,并給出相應(yīng)的建議。
[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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU364

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