钢筋混凝土框架结构的静力弹塑性推覆及其损伤分析

发布时间：2018-03-07 23:10

本文选题：框架结构　切入点：弹塑性分析　出处：《长沙理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：钢筋混凝土框架结构是采用梁、柱等杆件通过刚结点组成的空间体系。这种体系常用来作为建筑物的承重骨架结构。是目前工业与民用建筑中采用最广泛的结构形式之一。因此钢筋混凝土框架结构的抗震性能对人们生命财产安全有着直接的影响，近年来一系列地震表明，我们必须对建筑结构进行大震下的弹塑性分析。同时，，我国的《混凝土结构设计规范》（GB50010-2010）规定“重要或受力复杂的结构，宜采用弹塑性分析方法对结构整体或局部进行验算。” 现阶段的推倒分析是没有考虑结构损伤的混凝土非线性分析的。由于各类因素影响使得混凝土存在损伤，这些损伤会对混凝土应力-应变曲线产生影响。本文拟在原有推倒分析上加入损伤，并采用含损伤的本构关系对结构进行推倒分析。显然，在推倒分析中考虑损伤对结构的影响，会使得结构的静力弹塑性分析更加接近实际情况。本文所做工作如下: (1)首先介绍框架结构的构造、受力以及施工特点，阐述了以往钢筋混凝土结构的经典损伤本构关系。描述了国内外静力弹塑性分析与框架结构抗震分析现状。 (2)在以往经典混凝土损伤模型基础上，指出基于应力、应变或能量等效假定的损伤理论，在实际应用中的局限性。选用唐雪松副教授含有两个“损伤效应函数”的本构关系的理由：这种本构关系能揭示单、双标量损伤模型之间的联系，描述了损伤宏观效应与微观机制间的联系，能更真实的反应材料的损伤行为。 (3)用SAP2000软件建立两层钢筋混凝土框架模型。对结构进行模态分析与弹塑性分析。从而得出它们的自振周期、地震反应力、水平位移。根据结构地理位置、场地类别，计算出不同地震烈度下的ATC-40需求谱的参数C_A、C_V。采用三种不同侧向荷载施加模式，得到横向和纵向的静力弹塑性曲线。 (4)根据得到横向和纵向的静力弹塑性曲线，转换得到结构的地震反应谱曲线，将反应谱曲线与ATC-40需求谱曲线对比，得到不同震级下性能点位置。 (5)运用大型有限元分析软件ABAQUS，建立钢筋混凝土框架有限元模型。以材料损伤各向同性本构关系为理论基础，编写ABAQUS子程序。利用ABAQUS二次开发将损伤考虑到结构弹塑性分析中去，绘制出横向和纵向的位移侧向荷载关系曲线。结论证明考虑损伤之后弹塑性分析更贴近实际情况的结论。
[Abstract]:Reinforced concrete frame structures are made of beams, A space system in which columns and other members pass through rigid joints. This system is often used as the load-bearing skeleton structure of buildings. It is one of the most widely used structural forms in industrial and civil buildings at present. The seismic behavior of structures has a direct impact on the safety of people's lives and property. In recent years, a series of earthquakes have shown that we must carry out elastic-plastic analysis of building structures under large earthquakes. At the same time, the Code for Design of concrete structures in China (GB50010-2010) stipulates that "important or complicated structures," The elastoplastic analysis method should be used to check the whole or part of the structure. " The present push-down analysis does not consider the nonlinear analysis of concrete with structural damage. Due to the influence of various factors, there is damage in concrete. The damage will affect the stress-strain curve of concrete. In this paper, damage is added to the original push-down analysis, and the damage constitutive relation is used to analyze the structure. Considering the effect of damage on the structure in the push-down analysis, the static elastic-plastic analysis of the structure will be closer to the actual situation. The work done in this paper is as follows:. Firstly, the structure, force and construction characteristics of frame structure are introduced, and the classical damage constitutive relations of reinforced concrete structures in the past are expounded, and the present situation of static elastic-plastic analysis and seismic analysis of frame structures at home and abroad is described. 2) based on the classical concrete damage model, the damage theory based on the assumption of stress, strain or energy equivalence is pointed out. The reason why associate professor Tang Xuesong has two "damage effect function" constitutive relation: this kind of constitutive relation can reveal the relation between single and double scalar damage model. The relationship between the macroscopic effect of damage and the microscopic mechanism is described, and the damage behavior of the material can be more true. The model of two-story reinforced concrete frame is established by using SAP2000 software. The modal analysis and elastic-plastic analysis of the structure are carried out. The natural vibration period, seismic response force and horizontal displacement are obtained. The parameters of ATC-40 demand spectrum under different earthquake intensity are calculated. Using three different lateral load modes, the transverse and longitudinal static elastoplastic curves are obtained. 4) according to the static elastoplastic curves obtained from transverse and longitudinal directions, the seismic response spectrum curves of structures are obtained, and the response spectrum curves are compared with the ATC-40 demand spectrum curves, and the locations of the performance points at different magnitude are obtained. The finite element model of reinforced concrete frame is established by using the large-scale finite element analysis software Abaqus. Based on the theory of material damage isotropic constitutive relation, the ABAQUS subprogram is compiled. The damage is taken into account in the elastic-plastic analysis of the structure by the second development of ABAQUS. The lateral load curves of lateral and longitudinal displacement are drawn, and the conclusion that the elastic-plastic analysis is closer to the actual situation after considering damage is proved.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU375.4

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