The Isolation Experimental Study And Numerical Analysis Of The Concrete Masonry Building

As a new kind of masonry material, concrete hollow block has been widely used in recent years because of land reservation and energy saving. And concrete hollow block tends to be used in middle height and high-rise buildings. But recently, the study depth of the aseismic behavior for concrete hollow block is not enough, the Chinese seismic code restrict the height and layer relatively severely. But in order to meet the demand of high-layer development for city construction, we must break through the criterion restriction for the height and the layer. Seen from the domestic and overseas research, the constructions built from block are mostly below 6~7 stories, and the bay is relatively smaller, for such multi and high buildings,100 percent core injection is adopted. But in order to save the lands we should increase the height and the story of the construction, at the same time, in order to meet the using demand of the construction space for the consumers, we need to open and improve the flexible large space, but the aseismic behavior is following decreasing. In order to increase the aseismic behavior, we can use the isolated model structure. A great deal of experiments proved, the isolated structure using the sandwich rubber bearings can greatly minish the aseismic effect of the upside structure, it can ensure the safety and endurance of the structure, and also can decrease the aseismic intensity. Upside design can be calculated by decreasing intensity, and can decrease the part of the construction measures. The sections and the reinforcing steel bars of the components and the nodes can be diminished and can relax the architecture design restriction of the upside building, meet the large-bay demand. In this text, shaking table test is performed on an 8-story concrete hollow masonry with large bay. Based on this aim, several tasks were made: 1. Confirm the similitude law of the model, this model was designed and fabricated at a scale of 1/4, the construction measures of the model complied with the demand of intensity 7. Four sandwich were put between the foundation and the bottom of the model structure. 2. Shaking table test for the model structure. Choosing earthquake wave, designing table-board import, the test datum were analyzed, seismic behavior such as amplification coefficient, predominant frequency changes etc. were obtained. Contrasting the acceleration of the model before and after isolation at the measured layer, validate the damping effect of sandwich rubber bearings. 3. By establishing a 3-dimension finite-element modal and using the analysis software-ANSYS, we can make elastic numerical simulation, and get the dynamic characteristic and the aseismic behavior, the results compared with that of the test are basically identical. 4. Erecting mdof system shearing type model of the isolated construction model, adopting MATLAB to carry out time-history analyse, compared with the finite element results are almost identical, providing reference for engineering simplification calculation. By the above study, we can get following conclusion: high-rise and large-bay masonry building can use isolated settings. Using isolated settings can decrease the aseismic intensity. The finite element results and the MATLAB results compared with the test are basically identical. It proved that the sandwich rubber bearings can improve the seismic behavior of the model structure and the isolated building has excellent aseismic behavior. Consummating the design method of the isolator-seismic structure and promote the applications and developments of this technology in our country.