柔性連接新型砌體填充墻框架結(jié)構(gòu)抗震性能研究
[Abstract]:Considering the complex interaction between the infilled wall and the main frame, the masonry infilled wall frame structure can be visualized by two design and calculation methods: the first method regards the infilled wall as a structural member. In the design and calculation, the influence of the infilled wall on the stiffness and bearing capacity of the structure is taken into account. In this case, the infilled wall should be reliably connected with the surrounding frame to form a composite wall. The second method regards the infilled wall as a non-structural member, and only takes into account the weight of the infilled wall in the design calculation. In order to simplify or not consider the influence on the stiffness and bearing capacity of the structure, the infill wall and the frame Liang Zhu should have enough clearance to isolate the interaction between them, that is to say, the construction scheme of flexible connection between the wall and frame should be adopted. In this paper, the aseismic behavior of the infilled wall frame structure with flexible connection of wall and frame is studied systematically, aiming at the new type of filled wall material "fly ash self-insulating hollow block". The specific research work and innovation points are as follows: (1) the compressive and shear strength tests of fly ash hollow block masonry are carried out. According to the test results, the formula for calculating compressive and shear strength of hollow block masonry, Poisson's ratio, is obtained. The compressive stress-strain relationship and shear stress-shear strain relationship of masonry are presented. The calculation formula of shear strength of hollow block masonry under the action of shear-compression composite is given. (2) the low cycle reciprocating load test of hollow block wall is carried out. The results show that the horizontal bearing capacity and stiffness of hollow block masonry are calculated when the core column is installed. The ductility and energy dissipation capacity are improved obviously. (3) through the low cycle reciprocating load tests of 7 1:2 reinforced concrete hollow block filled wall frame structures, the flexible and rigid connections of wall and frame are systematically studied. The failure mechanism and aseismic performance of the frame structure filled with whole wall and half wall are analyzed. The hysteretic characteristics, bearing capacity, displacement ductility, stiffness degradation and strength attenuation are carried out. Analysis of energy dissipation capacity and deformation performance index. The results show that the bearing capacity of the flexible connection scheme is lower than that of the rigid connection scheme, but the other performance indexes are better than the rigid connection scheme, which indicates that the flexible connection scheme reduces the wall-frame interaction. The seismic behavior of infilled wall frame structure is improved effectively. At the same time, the flexible connection scheme reduces or eliminates the additional shear effect of the infilled wall on the frame column, improves the mechanical behavior of the frame column, and reduces the damage degree of the infilled wall. In addition, the installation of end core column of filled wall can effectively improve the bearing capacity, stiffness and overall stability of the structure. (4) the nonlinear finite element analysis of hollow block wall under monotonic horizontal loading is carried out by using homogeneous modeling method. The formula for calculating Poisson's ratio, compressive strength and elastic modulus of fly ash hollow block masonry is verified. And the reliability of compressive constitutive relation. (5) the numerical simulation analysis of hollow block masonry infilled wall frame is carried out using two kinds of modeling ideas: one method is to simulate the filled wall with homogenization model. The static elastic-plastic analysis under horizontal reciprocating load is carried out, and the equivalent spring element is used to simulate the infilled wall, and the static elastic-plastic analysis under monotone horizontal load is carried out. The calculated results of the two methods are in good agreement with the experimental results.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TU364;TU352.11
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