火电厂主厂房钢筋混凝土侧煤仓结构抗震性能分析及损伤评估

发布时间：2018-05-17 18:59

本文选题：火电厂主厂房 + 侧煤仓　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：煤仓是普遍应用于火电厂的重要构筑物,目前大型火力发电厂的工艺主厂房侧煤仓应用于钢煤斗结构的布置型式较多,而少有实例采用钢筋混凝土侧煤仓—钢筋混凝土煤斗结构方案。与钢煤斗结构相比,该结构型式可以充分利用侧煤仓空间,有效节省工程造价并加快施工进度。但由于结构中存在钢筋混凝土侧煤仓致使结构局部刚度增加较多,将造成上下层间刚度比相差较大,地震响应也极有可能较钢煤斗型式更加明显,因此研究该结构在地震作用下的抗震性能及损伤状态具有重要的理论意义和工程实用价值。本文重点内容是对火电厂主厂房钢筋混凝土侧煤仓结构建立计算模型,并进行地震作用下的动力弹塑性时程分析及震后结构的损伤评估,主要研究工作如下:(1)基于课题研究背景对火电厂主厂房结构的震害分析做了总结,并介绍了国内外学者对火电厂主厂房结构的研究现状;(2)介绍了代表性的地震损伤模型及相应的损伤计算方法;本文对材料方面损伤评估、局部方面损伤评估和整体结构方面损伤评估进行了系统的阐述。针对火电厂主厂房侧煤仓结构主要构件的破坏形式,以混凝土材料作为损伤目标,给出了各类构件损伤的计算方法,形成了该结构基于构件加权组合得到整体结构损伤的研究方法;(3)采用ABAQUS有限元软件对火电厂主厂房侧煤仓结构建立计算模型,并进行了模态分析和单向地震作用下的动力弹塑性时程分析,重点研究了地震作用下结构的变形和损伤,并对结果进行分析;(4)本文考虑各类构件的破坏对整体结构的影响引入重要性系数,使得结构损伤计算方法更加符合实际,结果更为精确;用文中提出的基于构件的损伤评估方法重点分析了7度、8度罕遇地震作用下结构的抗震性能及损伤评估,并给出了罕遇地震作用下提高该类结构抗震能力的措施建议。基于构件损伤角度评估侧煤仓结构抗震性能的这一研究方法思路明确、精确度较高,对火电厂主厂房侧煤仓类生命线工程结构设计具有一定的指导意义。
[Abstract]:Coal bunker is an important structure which is widely used in thermal power plant. At present, there are many types of arrangement of steel coal hopper structure used in the main technology workshop side coal bunker of large thermal power plant. But few examples adopt reinforced concrete side coal bunker-reinforced concrete coal hopper structure scheme. Compared with the steel coal hopper structure, the structure can make full use of the side coal bunker space, save the engineering cost and accelerate the construction progress. However, due to the existence of reinforced concrete side coal bunker in the structure, the local stiffness of the structure increases more, and the stiffness ratio between the upper and lower floors is larger, and the seismic response is likely to be more obvious than the steel coal hopper type. Therefore, it is of great theoretical significance and practical value to study the seismic behavior and damage state of the structure under earthquake. The main content of this paper is to establish the calculation model of reinforced concrete side coal bunker structure of main powerhouse of thermal power plant, and carry out dynamic elastic-plastic time history analysis and damage assessment of post-earthquake structure under the action of earthquake. The main research work is as follows: (1) based on the research background of the subject, the earthquake damage analysis of the main powerhouse structure of a thermal power plant is summarized. This paper also introduces the present situation of domestic and foreign scholars' research on the main powerhouse structure of thermal power plant, and introduces the representative earthquake damage model and the corresponding damage calculation methods. Local damage assessment and overall structural damage assessment are systematically described. In view of the failure form of the main components of the coal bunker structure on the side of the main powerhouse of a thermal power plant, the damage calculation method of various kinds of members is given by taking the concrete material as the damage target. The method of studying the damage of the whole structure based on the weighted combination of components is formed. The ABAQUS finite element software is used to establish the calculation model of the coal bunker structure on the side of the main powerhouse of the thermal power plant. Modal analysis and dynamic elastic-plastic time-history analysis under unidirectional earthquake are carried out. The deformation and damage of structures under earthquake are studied emphatically. And the results are analyzed. (4) in this paper, the importance coefficient is introduced into account of the influence of the failure of various kinds of members on the whole structure, which makes the method of structural damage calculation more practical and the result more accurate. In this paper, the damage assessment method based on component is used to analyze the seismic performance and damage assessment of the structure under the earthquake of 7 degrees or 8 degrees, and the measures to improve the seismic capacity of this kind of structure under the rare earthquake are put forward. The research method of evaluating seismic performance of side coal bunker structure based on damage angle of component is clear and accurate, which has certain guiding significance for structural design of lifeline engineering of side coal bunker of power plant.
【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】：2015
【分类号】：TU375

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