带有损伤和缺陷的混凝土框架结构抗震性能评价方法及其应用

发布时间：2018-04-21 21:11

本文选题：损伤模型 + 抗震性能评估　；参考：《江苏科技大学》2017年硕士论文

【摘要】：近年来,由于地震灾害的影响,我国大量的建筑结构受到了损伤破坏。同时,早期的建筑结构因规范不完善造成的自身缺陷,以及在长期的使用过程中存在耐久性损伤现象,因此对带有损伤和缺陷的结构进行抗震性能评估具有重要的现实意义。本文将混凝土框架结构作为研究对象,对损伤结构的分析模型进行了深入的研究,主要分为三个部分:框架结构的耐久性损伤模型研究、框架结构的地震损伤模型以及层损伤模型研究。本文的主要研究工作和成果如下:1、研究了碳化混凝土的本构关系模型、锈蚀钢筋的本构关系模型以及锈蚀钢筋混凝土粘结滑移本构关系模型。通过算例,对劣化材料本构关系模型进行修改,分析了混凝土碳化和钢筋锈蚀对整体结构的抗震性能影响。2、基于已有研究成果,对地震损伤构件恢复力骨架曲线的建立过程进行分析,提出了地震损伤构件的塑性铰模型的建立方法。根据Park-Ang提出的地震损伤模型计算损伤指数,选取39个构件的滞回曲线信息,得到不同损伤状态下结构构件的刚度、强度退化系数以及残余变形,将地震灾害描述与损伤指数联系起来,通过外观损伤确定构件的刚度、强度退化系数以及残余变形。根据结构pushover推覆曲线确定结构的损伤等级,分别选取10个混凝土柱和10个混凝土梁的滞回曲线信息,确定结构构件刚度、强度、残余变形与结构损伤等级的关系,对数据进行拟合,得到不同损伤等级下结构构件的刚度、强度退化系数以及残余变形。3、采用基于模态的物理参数识别贝叶斯方法,识别损伤结构的层刚度,根据识别结果,计算损伤结构的层恢复力模型骨架曲线的关键点参数,得到损伤结构的层恢复力模型,提出基于层模型的损伤结构抗震性能快速评价方法。4、根据本文提出的结构构件分析模型,以SAP2000为分析平台,修改损伤结构构件的塑性铰模型,通过静力弹塑性分析和动力时程分析方法,对损伤结构的抗震性能进行评估,研究表明,结构受到损伤后,其刚度、强度和延性都会降低,结构的层间位移角加大。基于该分析算例,将混凝土框架结构等效成剪切层模型,建立损伤结构的层恢复力模型,对简化模型进行分析,将结果与未简化框架结构的结果进行比较,验证本文提出的损伤结构层恢复力模型的可行性。
[Abstract]:In recent years, due to earthquake disasters, a large number of building structures in China have been damaged. At the same time, the defects of early building structures caused by imperfect codes, and durability damage in the long-term use process, so it is of great practical significance to evaluate the seismic performance of structures with damage and defects. In this paper, the concrete frame structure is taken as the research object, and the analysis model of the damaged structure is deeply studied, which is divided into three parts: the durability damage model of the frame structure. Research on seismic damage model and layer damage model of frame structure. The main work and results of this paper are as follows: 1. The constitutive relation model of carbonized concrete, the constitutive relation model of corroded steel bar and the bond-slip constitutive relation model of corroded reinforced concrete are studied. Through an example, the constitutive relation model of the degraded material is modified, and the influence of concrete carbonization and steel corrosion on the seismic behavior of the whole structure is analyzed. Based on the analysis of the building process of the restoring force skeleton curve of seismic damaged members, a method of establishing plastic hinge model of seismic damaged members is proposed. According to the seismic damage model proposed by Park-Ang, the damage index is calculated, and the information of hysteretic curves of 39 members is selected. The stiffness, strength degradation coefficient and residual deformation of structural members under different damage states are obtained. The earthquake disaster description is associated with the damage index, and the stiffness, strength degradation coefficient and residual deformation of the member are determined by the appearance damage. According to the pushover nappe curve of the structure, the damage grade of the structure is determined, and the hysteretic curve information of 10 concrete columns and 10 concrete beams are selected respectively to determine the relationship between the stiffness, strength, residual deformation and the damage grade of the structure. By fitting the data, the stiffness, strength degradation coefficient and residual deformation of structural members with different damage levels are obtained. Bayesian method based on modal physical parameters is used to identify the layer stiffness of damaged structures. The key point parameters of the skeleton curve of the layer restoring force model of damaged structure are calculated, and the layer restoring force model of the damaged structure is obtained. The fast evaluation method of seismic performance of the damaged structure based on the story model is put forward. According to the structural component analysis model proposed in this paper, Based on SAP2000, the plastic hinge model of damaged structural members is modified. The seismic performance of damaged structures is evaluated by static elasto-plastic analysis and dynamic time-history analysis. Both the strength and ductility of the structure will be reduced, and the interstory displacement angle of the structure will be increased. Based on the analysis example, the concrete frame structure is equivalent to the shear layer model, and the layer restoring force model of the damaged structure is established. The simplified model is analyzed, and the results are compared with the results of the unsimplified frame structure. The feasibility of the model proposed in this paper is verified.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4;TU352.11

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