地震作用下1000MW机组空冷支架结构体系选型研究

发布时间：2018-04-17 18:06

本文选题：钢桁架+伞撑结构 + 地震反应分析　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：1000MW机组较之300MW、600MW机组时空冷支架结构体系总高增大、设备荷重增加，地震反应和风致效应增大。如果在高烈度地区仍采用传统的钢桁架+钢筋混凝土管柱结构体系，将会出现悬挑端的竖向位移和结构的水平侧移较大，难于满足现行规范和空冷工艺的要求。本文基于钢桁架+大尺寸钢筋混凝土管柱、钢桁架+伞撑式钢筋混凝土管柱两种空冷结构拟动力、拟静力试验和钢桁架+大尺寸钢筋混凝土管柱、鱼腹式钢桁架+大尺寸钢筋混凝土管柱、钢桁架+伞撑式钢筋混凝土管柱三种空冷结构体系，通过竖向荷载、风荷载下体系受力性能分析和体系地震作用反应分析及空冷支架结构体系抗震性能试验分析，提出了高烈度区满足抗震性能要求的1000MW机组时空冷结构体系的适用型式。（1）采用SAP2000有限元软件建立空冷支架结构有限元模型。对钢桁架+大尺寸钢筋混凝土管柱结构、鱼腹式钢桁架+大尺寸钢筋混凝土管柱结构和钢桁架+伞撑式钢筋混凝土管柱结构在竖向荷载、风荷载和地震作用下的受力性能以及结构的动力特性进行分析，，研究三个结构的杆件内力和整体位移变化情况。（2）对钢桁架+大尺寸钢筋混凝土管柱结构和钢桁架+伞撑式钢筋混凝土管柱结构进行模型结构拟动力和拟静力试验，观察和分析结构的破坏过程、构件的受力特点和结构的薄弱部位等。从试验现象、刚度退化、滞回耗能、骨架曲线、变形性能以及典型构件的受力行为等方面对两个结构进行分析，研究结构的抗震性能。（3）通过引入层次分析法，基于层次分析法基本理论，将定量和定性的评价相结合，对高烈度区大容量机组分别采用钢桁架+大尺寸钢筋混凝土管柱结构和钢桁架+伞撑式钢筋混凝土管柱结构作出评价。研究表明：钢桁架+伞撑式钢筋混凝土管柱结构的受力和抗震性能能够满足高烈度区1000MW机组空冷支架结构的要求。与钢桁架+大尺寸钢筋混凝土管柱结构相比，钢桁架+伞撑式钢筋混凝土管柱结构的竖向挠度和水平侧移都明显减小，承载能力提高。研究成果可为大容量机组空冷支架结构的设计和应用提供理论依据。
[Abstract]:Compared with 300MW / 600MW unit, the total height of space-time cooling support system of 1000MW unit increases, the load of equipment increases, and the seismic response and wind-induced effect increase.If the traditional steel truss reinforced concrete tubular column system is still adopted in the high intensity area, the vertical displacement of the cantilever end and the horizontal lateral displacement of the structure will be larger, which is difficult to meet the requirements of the current code and air-cooling technology.This paper is based on two kinds of air-cooled structures, such as steel truss large size reinforced concrete pipe string, steel truss umbrella braced reinforced concrete pipe string, pseudo-static test and steel truss large size reinforced concrete pipe string.Three kinds of air-cooled structural systems, such as large size reinforced concrete pipe column of fish-web steel truss and steel truss umbrella braced reinforced concrete pipe string, are subjected to vertical load.Based on the analysis of the mechanical behavior of the system under the wind load, the seismic response analysis of the system and the experimental analysis of the seismic performance of the air-cooled support structure system, a suitable type of space-time cold structure system for 1000MW units satisfying the requirements of seismic performance in the high intensity region is proposed.1) the finite element model of air cooling support structure is established by SAP2000 finite element software.For steel truss large-size reinforced concrete pipe column structure, fish-web steel truss large-size reinforced concrete pipe column structure and steel truss umbrella braced reinforced concrete pipe column structure under vertical load,The dynamic behavior of the three structures under wind load and earthquake is analyzed and the internal force and the whole displacement of the three structures are studied.(2) the pseudo-dynamic and quasi-static tests of steel truss large-sized reinforced concrete tubular column structure and steel-truss umbrella braced reinforced concrete tubular column structure are carried out, and the failure process of the structure is observed and analyzed.The mechanical characteristics of the members and the weak parts of the structure, etc.The aseismic behavior of the two structures is analyzed from the aspects of experimental phenomena, stiffness degradation, hysteretic energy dissipation, skeleton curve, deformation performance and the mechanical behavior of typical members.By introducing the Analytic hierarchy process (AHP) and based on the basic theory of AHP, the quantitative and qualitative evaluation is combined.The steel truss large-sized reinforced concrete pipe column structure and the steel truss umbrella braced reinforced concrete pipe string structure are used to evaluate the large capacity units in the high intensity region.The results show that the stress and seismic behavior of steel truss umbrella braced reinforced concrete tubular column structure can meet the requirements of air-cooled support structure of 1000MW units in high intensity region.Compared with steel truss large size reinforced concrete tubular column structure the vertical deflection and horizontal lateral displacement of steel truss umbrella braced reinforced concrete tubular column structure are obviously reduced and the bearing capacity is improved.The research results can provide theoretical basis for the design and application of air-cooling support structure for large capacity units.
【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】：TU318;TU352.11

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