【摘要】：鋼筋混凝土結(jié)構(gòu)在建筑中應(yīng)用廣泛,每年遭受火災(zāi)的數(shù)量也相對較多。鋼筋混凝土柱作為結(jié)構(gòu)的主要承重構(gòu)件,且鋼筋混凝土在高溫中會造成力學(xué)性能的下降,一旦柱發(fā)生剪切破壞,會造成建筑的倒塌。國內(nèi)外對于其在高溫中的抗剪性能有了一些研究并取得了一定的成果。但國內(nèi)外對于鋼筋混凝土柱在高溫中的研究通常選用的是中柱作為研究模型而忽略了邊柱和角柱的研究。本文以鋼筋混凝土矩形截面角柱作為研究模型,應(yīng)用ABAQUS有限元分析軟件模擬分析,通過研究鋼筋混凝土矩形截面角柱在高溫時的溫度場分析情況,高溫時抗剪性能并與常溫狀態(tài)下進行比較。并且通過Visual C++6.0軟件編程,方便計算鋼筋混凝土矩形截面角柱剪力大小并判斷是否被剪切破壞。主要做了以下工作：1.常溫狀態(tài)下鋼筋混凝土矩形截面柱抗剪研究。運用ABAQUS軟件模擬分析鋼筋混凝土矩形截面柱受到水平荷載和豎向荷載共同作用時產(chǎn)生的剪力大小,并研究相關(guān)的影響因素。研究表明,長細比和軸壓比是影響常溫狀態(tài)下鋼筋混凝土矩形截面柱抗剪性能的主要因素,增加混凝土的強度、提高縱筋強度、提高箍筋配筋率在一定范圍內(nèi)可以提高鋼筋混凝土矩形截面柱的抗剪性能,而保護層厚度不是影響抗剪能力的主要因素。2.鋼筋混凝土矩形截面角柱的溫度場分析。運用ABAQUS軟件模擬分析兩面受火的鋼筋混凝土矩形截面角柱的溫度場形式,并研究相關(guān)的影響因素。研究表明：截面尺寸和受火時間是影響溫度場分布的主要因素,而不同升溫曲線對溫度場分布影響較小。3.高溫狀態(tài)下鋼筋混凝矩形截面土角柱抗剪研究。運用ABAQUS軟件模擬分析鋼筋混凝土矩形截面角柱在兩面受火的時候產(chǎn)生的剪力大小,研究相關(guān)的影響因素,并且與常溫狀態(tài)時鋼筋混凝土矩形截面角柱抗剪性能進行比較。研究表明：高溫狀態(tài)下,保護層厚度、截面尺寸是影響抗剪能力的主要因素；提高配筋率可以增強鋼筋混凝土矩形截面柱的抗剪能力,但過高的配筋率會造成結(jié)構(gòu)脆性破壞；而提高混凝土標號并不能提高鋼筋混凝土矩形截面角柱的抗剪能力。4.運用C語言對常溫狀態(tài)下及高溫狀態(tài)下鋼筋混凝土柱抗剪能力大小進行編程,并給出相關(guān)算例。探討不同影響因素下,鋼筋混凝土柱是否受到了破壞。本文所做的工作為今后鋼筋混凝土矩形截面角柱抗剪性能深入研究、制定高溫時鋼筋混凝土矩形截面角柱抗剪規(guī)范提供一定的參考作用。
[Abstract]:Reinforced concrete structures are widely used in buildings, and the number of fires is also relatively large each year. Reinforced concrete columns as the main load-bearing member of the structure, and reinforced concrete at high temperature will lead to the decline of mechanical properties, once the column shear failure, will lead to the collapse of the building. At home and abroad, some researches have been made on the shear properties of the materials at high temperatures and some achievements have been made. However, the research of reinforced concrete columns at high temperature at home and abroad usually chooses the middle column as the research model, but neglects the research of the side column and corner column. In this paper, the reinforced concrete rectangular cross-section corner column is taken as the research model, and the temperature field of the reinforced concrete rectangular cross-section corner column at high temperature is studied by using the ABAQUS finite element analysis software. The shear resistance at high temperature is compared with that at room temperature. It is convenient to calculate the shear force of reinforced concrete rectangular cross-section corner column and to judge whether it is destroyed by shear or not by Visual C 6.0 program. The main work done is as follows: 1. Shear resistance of reinforced concrete rectangular section columns at room temperature. The shear force of reinforced concrete rectangular section column subjected to horizontal load and vertical load is simulated by ABAQUS software, and the related influencing factors are studied. The results show that the slenderness ratio and axial compression ratio are the main factors that affect the shear performance of reinforced concrete rectangular section columns at room temperature, increase the strength of concrete and increase the strength of longitudinal bars. The shear resistance of reinforced concrete rectangular section columns can be improved by increasing the ratio of stirrups in a certain range, but the thickness of protective layer is not the main factor affecting the shear capacity. Temperature field analysis of reinforced concrete rectangular cross-section corner column. The ABAQUS software is used to simulate and analyze the temperature field of reinforced concrete rectangular cross-section corner columns with fire on both sides, and the related factors are studied. The results show that the cross section size and fire time are the main factors that affect the temperature distribution, but different heating curves have little effect on the temperature distribution. 3. Shear resistance of reinforced concrete rectangular section corner columns at high temperature. The shear force of reinforced concrete rectangular cross-section corner columns under fire is simulated by ABAQUS software, and the related factors are studied. The shear behavior of reinforced concrete rectangular cross-section angular columns is compared with that of reinforced concrete rectangular section angular columns at room temperature. The results show that the thickness of the protective layer and the size of the section are the main factors affecting the shear capacity at high temperature, and the improvement of the reinforcement ratio can enhance the shear capacity of the reinforced concrete rectangular section columns, but the brittle failure of the structure can be caused by the excessive reinforcement ratio, and the shear resistance of reinforced concrete rectangular section columns can be enhanced by increasing the reinforcement ratio. The shear resistance of reinforced concrete rectangular cross-section corner columns can not be improved by increasing the grade of concrete. 4. The shear capacity of reinforced concrete columns at room temperature and high temperature is programmed with C language, and some examples are given. This paper discusses whether reinforced concrete columns are damaged under different influence factors. The work done in this paper provides a reference for further research on the shear behavior of reinforced concrete rectangular cross-section angular columns and the formulation of shear resistance codes for reinforced concrete rectangular cross-section angular columns at high temperature.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU352.5;TU375

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