大型火电厂钢结构主厂房框排架结构抗震性能及设计方法研究.pdf
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1、西安建筑科技大学申请博士学位论文大型火电厂钢结构主厂房框排架结构抗 震性能及设计方法研究 西安建筑科技大学 土木工程学院 A DissertationSubmitted to the Academic Committeeof Xi5an University of Architecture&Technology for Degree of Philosophy Doctor in Disaster Prevention and Mitigation EngineeringStudy on Seismic Behavior and Seismic Design Method of Steel F
2、rame-bent Structures of Large Thermal Power Plant Main BuildingsByLiang JiongfengUnder The Guidance ofProfessor Xue JianyangCollege of Civil Engineering Xian University of Architecture&Technology March 2013西安建筑科技大学博士学位论文大型火电厂钢结构主厂房框排架结构 抗震性能及设计方法研究 摘 要在我国,火电厂主体结构常采用钢筋混凝土框排架结构,而随着电厂单机容 量的不断增大,主厂房的高度和
3、跨度随之增加,具有布置灵活、自重轻、强度高、施工快、抗震性能好等优点的钢结构,成为了中国大型火电厂主厂房的主要结构 形式,尤其成为在抗震设防区建造大型火电厂的首选形式。课题组前期已经研究 了大型火电厂钢结构异型节点受力性能,为了揭示大型火电厂钢结构主厂房框排 架结构抗震性能,建立其相对应的设计方法,本文进行了系统研究。设计了 1根缩尺比为1/10三跨五层的钢框排架模型,通过对其进行拟动力试 验,研究其在预估地震作用下的加速度反应、位移反应、滞回特性、刚度和耗能 性能。研究结果表明:钢框排架结构延性相对较好,具有较强的塑性变形能力。模型结构在三种地震波(El Centro波、Taft波、兰州人工
4、波)的多遇地震以及E1 Centro波的罕遇地震作用下,层间位移角均满足我国现行规范要求。钢框排架结 构体系可满足8度设防要求,具有良好抗震性能。在拟动力试验结束后,又对该 根钢框排架结构进行了拟静力试验,观测了框排架的破坏形态,得到了试件的荷 载一位移滞回曲线、骨架曲线,分析了钢框排架的破坏机制、滞回性能、延性、耗能能力、刚度退化等力学性能。结果表明:钢框排架结构的破坏机制为先梁端 后柱端出现塑性钱的混合破坏机制,滞回曲线较饱满,整体位移延性系数大于4.0,等效黏滞阻尼系数达到0.185o钢框排架结构体系总体上表现出良好的抗震能力,适合高烈度抗震设防区采用。模型结构的层间位移角在底层和第二层
5、较大,为薄 弱层;煤斗梁地震反应较强,设计时要特别注意。采用有限元软件Sap2000对平面钢框排架结构进行了时程分析,计算结果与 试验结果符合较好。根据计算结果,对钢框排架结构的变形性能进行了分析,明 确了大震作用下塑性钱的出现次序和发展规律,研究了错层对结构性能的影响和 框架、排架之间的协同工作情况。西安建筑科技大学博士学位论文采用有限元软件Midas/gen对钢框排架整体厂房进行了弹性时程分析、弹塑性 时程分析、静力弹塑性分析,研究了主厂房的变形能力、薄弱部位、受力机理及 其破坏机制。计算结果表明:钢框排架延性相对较好,具有较强的塑性变形能力 和抗震能力。主厂房横向框排架和纵向框架一支撑结
6、构存在较多的薄弱部位;煤 斗梁刚度超强,要特别注意柱截面的选取,结构计算分析应采用考虑扭转效应的 空间模型。参考国内外规范相关规定,将钢框排架结构的性能水平划分为正常使用、基 本使用、生命安全和接近倒塌四个等级,并结合地震设防水准,给出了钢框排架 结构的抗震性能目标。在钢框排架结构抗震性能试验研究的基础上,提出了钢框 排架对应四个性能水平的层间位移角限值。给出了基于位移的设计方法在主厂房 钢框排架结构设计中的设计步骤,并以一工程实例详细说明了钢框排架结构基于 位移的设计过程。提出根据结构损伤期望对钢框排架结构进行抗震优化设计,并建立了钢框排 架结构抗震优化设计的数学模型,给出了其优化设计步骤。
7、基于ANSYS软件的二 次开发平台,采用APDL语言编制了钢框排架结构抗震优化设计程序,并采取该 程序对一工程实例进行抗震设计优化,验证了所采用的优化思路和方法的可行性。在试验研究和理论分析基础上,结合火电厂特点和多高层钢结构设计方法,提出了钢框排架主厂房的抗震设计建议,可为工程应用提供参考。关 键词:大型火电厂;框排架;抗震性能;拟动力试验;拟静力试验;时程分析;静力弹塑性分析;抗震设计论文类型:应用基础研究基金项目:国家自然科学基金(501168002);中国博士后科学基金(20080440814)西安建筑科技大学博士学位论文Study on Seismic Behavior and Se
8、ismic Design Method of Steel Frame-bent Structures of Large Thermal Power Plant Main BuildingsSpecialty:Disaster Prevention and Mitigation Engineering Ph.D Candidate:Liang JiongfengInstructor:Prof.Xue JianyangAbstractIn China,the reinforced concrete frame-bent structure often are used in the main st
9、ructure of the thermal power plant,while the height and span of the main power house increased with the increasing of the power plant unit capacity,the steel structure with flex ible layout,light weight,high strength,quickly construction,good seismic performance advantages,has become the main struct
10、ure of the main plant of large thermal power plants.In particular,it has become the preferred form of construction of large thermal power plants in the earthquake-proof.The mechanical behavior of irregular joints of steel structure of large thermal power plants have been studied.Based on the previou
11、s studies,the research on seismic performance and design method of steel frame-bent structures of large thermal power plant main buildings is systematically performed in this dissertation.According to the ex perimental study on a 1:10 model of steel frame-bent structure under pseudo-dynamic test.The
12、 seismic responses such as acceleration,displacement,varying stiffess,hysteretic property and energy consumption were analyzed.The results show that the steel frame-bent structure has good ductility and strong plastic deformation capacity.The max imum story drift angles of the model structure under
13、intensity 8 frequent and rare earthquakes are all less than their limit values regulated by the present seismic code.Steel frame-bent structures satisfied the demand of seismic design in 8 intensity zones,and has good seismic behaviors.After the pseudo-dynamic test,the ex perimental study on the mod
14、el of a three-bay and five-story steel frame-bent structures under low cyclic reversed loading was to do.The failure condition of frame-bent 西安建筑科技大学博士学位论文structures is observed.The load-displacement hysteretic loops and skeleton curve of tested model are obtained.The failure mechanism,hysteretic be
15、havior,ductility,energy dissipation capacity and stiffness degeneration were investigated.The results show that the failure mechanism of steel frame-bent structures is the first occurrence of beam-hinge and then column-hinge mechanism.The hysteretic loops are a plump.The average of the overall ducti
16、lity factors is greater 4.The equivalent viscous dampings coefficient is 0.185.The steel frame-bent structures ex hibits ex cellent seismic behavior,and can be adopted in high seismic fortification zones.The inter-story displacement rotation is relatively large on the bottom floor and the second flo
17、or,namely the weak floor.And there is larger earthquake action at the coal hopper beams,which must be paid attention in design.The time history response analysis on flat steel frame bent structure were carried out by using SAP2000.The calculated results agree well with ex perimental results.Accordin
18、g to the calculated results,the deformation performance are analyzed,the plastic hinges in the order and law under strong earthquakes are got.The influence of structure properties from split-level,coordination between the frame and bent work.The elastic time history response analysis method,dynamic
19、elastic-plastic analysis method,static pushover analysis method are used to study the deformation,weak parts,loading capacity and failure mechanisms of steel frame-bent structures of large thermal power plant main buildings by using Midas/gen.The results show that the steel frame-bent structure has
20、good ductility,strong plastic deformation capacity and seismic performance.But the horizontal frame-bent and longitudinal frame-supporting structures have much weak parts,and there is larger earthquake action at the coal hopper beams,which must be paid attention when designed.lt should be used the s
21、pace model considering the effect of torsion on the structure to calculate and analysis.Refer to the domestic and foreign relevant norms,four performance levels are put forward fbr steel frame-bent structures,which are normal operation,basic operation,life safety and collapse prevention.The seismic
22、levels and four performance levels are combined to form the seismic performance target.Based on the results of seismic performance tests on steel frame-bent structures,the max imum inter-story drift angle corresponding to different performance levels are presented for the steel frame-bent 西安建筑科技大学博士
23、学位论文structures.The displacement-based seismic design(DBSD)method was proposed to steel frame-bent structures.The procedure of the DBSD was given,and taking one steel frame-bent structure of main building as an ex ample,the design process was demonstrated.The seismic optimal design of the steel frame
24、-bent structures based on structural damage ex pectations was proposed.The seismic optimal design mathematical model of the steel frame-bent structures was set up and the optimized design steps were given.The seismic optimal design program of the steel frame-bent structures was compiled by using APD
25、L based on the secondary development platform in ANSYS.The feasibility of optimizing idea and method was verified by an engineering ex ample.Based on ex perimental study and theoretical analysis,combined the characteristics of thermal power plants and high-rise steel structure design method,the seis
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