1000MW带伞撑空冷支架结构体系弹塑性时程分析
发布时间：2018-11-10 08:32
【摘要】：传统空冷支架结构采用钢桁架+混凝土管柱竖向混合结构体系，应用于高烈度区大容量机组时出现了如侧移刚度小、悬挑端挠度过大、用钢量大等诸多问题。因而提出了在钢桁架下部增设斜撑的钢桁架+伞撑+混凝土管柱的新型空冷支架结构体系，极大的改善了结构的受力性能和变形性能，降低了结构造价。从节省成本出发，又提出了经济性更好的钢桁架的伞撑+实腹梁+混凝土管柱空冷支架结构体系。本文通过课题组完成的钢桁架+伞撑空冷支架结构抗震性能试验结果校正ABAQUS有限元模型参数，分别对两种带伞撑新型空冷支架结构体系进行地震作用下的弹塑性分析，并对其抗震性能作出了评价。 （1）采用ABAQUS有限元软件，建立了钢桁架+伞撑空冷支架试验结构有限元模型，并对其进行了动力特性分析。采用混凝土损伤塑性模型，对结构进行了以力为目标的静力弹塑性分析，将分析结果与试验测试结果进行对比，验证了模型简化方法和参数选择的合理性。 （2）采用与试验结构同样的简化处理方法和有限元参数，对某8度区采用四边悬挑钢桁架+伞撑空冷支架结构体系的1000MW空冷机组建立了有限元模型，计算其动力特性和地震作用下的响应。根据动力特性数据，分析了空冷支架结构扭转效应明显的原因；分析结构的损伤情况，掌握了钢构件应力分布特点和混凝土管柱的破坏过程，判断结构的薄弱部位并提出了相应的建议和改进措施；根据结构位移响应和刚度退化情况，判断了结构在各强度地震作用下是否满足“小震不坏、中震可修、大震不倒”的抗震要求，给出了适用于带伞撑新型空冷支架结构体系的新的位移控制指标。 （3）采用与钢桁架+伞撑空冷支架结构体系相同的思路，对8度区采用四边悬挑伞撑+实腹梁空冷支架结构体系的1000MW空冷机组建立了有限元模型，并对其进行了动力特性分析和弹塑性动力时程分析。分析动力特性计算结果，掌握了结构体系的自振特点；结合钢桁架+伞撑空冷支架结构非线性计算结果，分析了伞撑+实腹梁空冷支架结构位移响应特点、管柱破坏过程、刚度退化情况和钢构件应力分布特点，并对抗震性能作出了评价。 （4）结合两种带伞撑空冷支架结构体系非线性分析数据，分别从基本受力性能、抗震性能、经济性三个方面对两种结构体系进行了对比，掌握了两种带伞撑空冷支架结构体系各自优缺点，可为结构选型和设计提供参考。 综上所述，通过抗震性能试验结果校正了有限元模型参数，使其参数选择更加合理，，对两种带伞撑空冷支架结构进行了弹塑性时程分析，研究了两种体系的抗震性能，提出了新的位移控制指标，并对其薄弱部位提出了加强建议，对实际工程中空冷支架结构体系的选型和分析设计提供了参考资料。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398;TU313
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398;TU313
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