【摘要】：火災因其能夠造成巨大的生命和財產(chǎn)損失,已成為人類社會的主要災害之一�；炷两Y(jié)構(gòu)作為建筑領(lǐng)域最常見的結(jié)構(gòu)形式,其火災安全性對于保證人民生命和財產(chǎn)的安全具有重要的意義。然而,目前的已有研究主要集中于傳統(tǒng)的結(jié)構(gòu)形式,短肢剪力墻作為一種新興的結(jié)構(gòu)形式,其火災安全性卻鮮有研究。鑒于目前短肢剪力墻抗火研究現(xiàn)狀,本文采用數(shù)值分析的方法,對短肢剪力墻的抗剪能力在火災高溫下得演化進行分析,總結(jié)高溫演化規(guī)律,為短肢剪力墻的抗火設(shè)計提供參考。本文具體完成的工作如下:(1)對鋼筋和混凝土這兩種材料的高溫力學特性以及熱工參數(shù)進行了文獻調(diào)研,總結(jié)了國內(nèi)外學者對這兩種材料研究的成果,并選取合適的材料參數(shù),用于本文的數(shù)值分析中。(2)從導熱微分方程出發(fā),闡述了瞬態(tài)溫度場的有限元求解條件,并應用ABAQUS軟件對短肢剪力墻進行了溫度場分析。討論了受火時間、導熱系數(shù)、受火工況、混凝土保護層厚度等因素對短肢剪力墻溫度場的影響。(3)應用文獻報道的短肢剪力墻的常溫試驗結(jié)果,驗證本文用于短肢剪力墻抗剪能力分析的非線性有限元分析模塊的有效性。(4)采用順序熱-力耦合方法,應用驗證的非線性有限元力學分析模塊,對高溫下短肢剪力墻抗剪力的高溫演化進行模擬分析,并對不同肢厚比、不同軸壓比、不同保護層厚度、不同受火面以及翼緣箍筋間距等對短肢剪力墻抗剪力的影響進行分析,提出短肢剪力墻抗火工程建議,供抗火設(shè)計參考。
[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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU398.2

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