1000MW帶傘撐空冷支架結(jié)構(gòu)體系彈塑性時程分析
[Abstract]:The traditional air-cooled support structure adopts steel truss concrete pipe column vertical hybrid structure system. When applied to large capacity units in high intensity region, there are many problems such as small lateral stiffness, excessive deflection of cantilever end and large amount of steel used. Therefore, a new air-cooled support system of concrete pipe column with steel truss with inclined brace is put forward, which greatly improves the mechanical and deformation performance of the structure and reduces the cost of the structure. In order to save the cost, the air-cooled support system of steel truss with solid web beam and concrete pipe column is put forward. In this paper, based on the experimental results of seismic behavior of steel truss parachute-supported air-cooled support structures, the parameters of ABAQUS finite element model are corrected, and the elastic-plastic analysis of two kinds of new air-cooled support structures with umbrella brace under seismic action is carried out respectively. The seismic performance is evaluated. The main contents are as follows: (1) the finite element model of the experimental structure of steel truss supported air-cooled support is established by using ABAQUS finite element software, and its dynamic characteristics are analyzed. The static elastic-plastic analysis of the structure with force as its target is carried out by using the concrete damage plastic model. The analysis results are compared with the test results, and the rationality of the simplified model and the selection of parameters are verified. (2) using the same simplified treatment method and finite element parameters as the experimental structure, the finite element model of the 1000MW air-cooled unit with four-sided cantilever steel truss supported air-cooled support in an 8-degree zone is established. Its dynamic characteristics and seismic response are calculated. According to the data of dynamic characteristics, the causes of torsional effect of air-cooled support structure are analyzed. The damage of the structure is analyzed, the stress distribution characteristics of the steel members and the failure process of the concrete pipe column are grasped, the weak position of the structure is judged and the corresponding suggestions and improvement measures are put forward. According to the displacement response and stiffness degradation of the structure, it is judged whether the structure meets the seismic requirements of "small earthquake is not bad, medium earthquake is repairable, large earthquake does not collapse" under the action of each intensity earthquake. A new displacement control index for a new type of air-cooled support system with umbrella brace is presented. (3) using the same idea as the steel truss parachute-supported air-cooled support structure system, the finite element model of the 1000MW air-cooled unit with four-side cantilevered umbrella braced solid web-beam air-cooled support structure system in 8 degree region is established. Dynamic characteristic analysis and elastoplastic dynamic time history analysis are carried out. By analyzing the calculation results of the dynamic characteristics, the natural vibration characteristics of the structure system are grasped. Based on the nonlinear calculation results of steel truss, the characteristics of displacement response, failure process of pipe string, stiffness degradation and stress distribution of steel members are analyzed. The seismic performance is evaluated. (4) combining with the nonlinear analysis data of two kinds of air-cooled support structures with umbrellas, the two structural systems are compared from three aspects: basic mechanical performance, aseismic performance and economic efficiency, respectively. The merits and demerits of the two kinds of air-cooled support with umbrellas are grasped, which can provide a reference for the selection and design of the structure. To sum up, the finite element model parameters are corrected by the seismic performance test results, which make the selection of the parameters more reasonable. The elastic-plastic time history analysis of two kinds of air-cooled support structures with umbrellas is carried out, and the seismic performance of the two systems is studied. A new displacement control index is put forward, and some suggestions for strengthening the weak position are put forward, which provides a reference for the selection, analysis and design of the structural system of hollow cold support in practical engineering.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:TU398;TU313
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