高温下短肢剪力墙抗剪力演化的非线性有限元分析

发布时间：2018-09-05 20:54

【摘要】：火灾因其能够造成巨大的生命和财产损失,已成为人类社会的主要灾害之一。混凝土结构作为建筑领域最常见的结构形式,其火灾安全性对于保证人民生命和财产的安全具有重要的意义。然而,目前的已有研究主要集中于传统的结构形式,短肢剪力墙作为一种新兴的结构形式,其火灾安全性却鲜有研究。鉴于目前短肢剪力墙抗火研究现状,本文采用数值分析的方法,对短肢剪力墙的抗剪能力在火灾高温下得演化进行分析,总结高温演化规律,为短肢剪力墙的抗火设计提供参考。本文具体完成的工作如下:(1)对钢筋和混凝土这两种材料的高温力学特性以及热工参数进行了文献调研,总结了国内外学者对这两种材料研究的成果,并选取合适的材料参数,用于本文的数值分析中。(2)从导热微分方程出发,阐述了瞬态温度场的有限元求解条件,并应用ABAQUS软件对短肢剪力墙进行了温度场分析。讨论了受火时间、导热系数、受火工况、混凝土保护层厚度等因素对短肢剪力墙温度场的影响。(3)应用文献报道的短肢剪力墙的常温试验结果,验证本文用于短肢剪力墙抗剪能力分析的非线性有限元分析模块的有效性。(4)采用顺序热-力耦合方法,应用验证的非线性有限元力学分析模块,对高温下短肢剪力墙抗剪力的高温演化进行模拟分析,并对不同肢厚比、不同轴压比、不同保护层厚度、不同受火面以及翼缘箍筋间距等对短肢剪力墙抗剪力的影响进行分析,提出短肢剪力墙抗火工程建议,供抗火设计参考。
[Abstract]:Fire has become one of the main disasters in human society because it can cause huge loss of life and property. As the most common structural form in the field of construction, the fire safety of concrete structure is of great significance to ensure the safety of people's life and property. However, the existing researches mainly focus on the traditional structural forms. As a new structural form, the fire safety of short-leg shear wall is seldom studied. In view of the present research situation of short leg shear wall fire resistance, this paper analyzes the evolution of short leg shear wall's shear resistance under fire high temperature by numerical analysis method, and summarizes the law of high temperature evolution. It provides a reference for the fire resistance design of short shear wall. The main works of this paper are as follows: (1) A literature investigation on the high temperature mechanical properties and thermal parameters of steel bar and concrete is carried out, and the research results of these two materials are summarized, and the appropriate material parameters are selected. It is used in the numerical analysis of this paper. (2) based on the heat conduction differential equation, the finite element solution condition of transient temperature field is expounded, and the temperature field of short-leg shear wall is analyzed by ABAQUS software. The effects of fire time, thermal conductivity, fire condition and the thickness of concrete cover on the temperature field of short-leg shear wall are discussed. (3) the results of short-leg shear wall test at room temperature reported in literature are used. The effectiveness of the nonlinear finite element analysis module for the shear capacity analysis of short-leg shear walls is verified. (4) the sequential thermal-mechanical coupling method is used to verify the nonlinear finite element mechanics analysis module. The high temperature evolution of shear resistance of short leg shear wall under high temperature is simulated and analyzed. The effects of different limb thickness ratio, different axial compression ratio, different protective layer thickness, different fire surface and space between flange stirrups on the shear resistance of short leg shear wall are analyzed. The fire-resistant engineering suggestion of short-leg shear wall is put forward, which can be used as a reference for fire resistance design.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2

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