火灾下钢筋混凝土矩形截面柱抗剪性能研究
发布时间：2019-04-15 18:42
【摘要】：钢筋混凝土结构在建筑中应用广泛,每年遭受火灾的数量也相对较多。钢筋混凝土柱作为结构的主要承重构件,且钢筋混凝土在高温中会造成力学性能的下降,一旦柱发生剪切破坏,会造成建筑的倒塌。国内外对于其在高温中的抗剪性能有了一些研究并取得了一定的成果。但国内外对于钢筋混凝土柱在高温中的研究通常选用的是中柱作为研究模型而忽略了边柱和角柱的研究。本文以钢筋混凝土矩形截面角柱作为研究模型,应用ABAQUS有限元分析软件模拟分析,通过研究钢筋混凝土矩形截面角柱在高温时的温度场分析情况,高温时抗剪性能并与常温状态下进行比较。并且通过Visual C++6.0软件编程,方便计算钢筋混凝土矩形截面角柱剪力大小并判断是否被剪切破坏。主要做了以下工作：1.常温状态下钢筋混凝土矩形截面柱抗剪研究。运用ABAQUS软件模拟分析钢筋混凝土矩形截面柱受到水平荷载和竖向荷载共同作用时产生的剪力大小,并研究相关的影响因素。研究表明,长细比和轴压比是影响常温状态下钢筋混凝土矩形截面柱抗剪性能的主要因素,增加混凝土的强度、提高纵筋强度、提高箍筋配筋率在一定范围内可以提高钢筋混凝土矩形截面柱的抗剪性能,而保护层厚度不是影响抗剪能力的主要因素。2.钢筋混凝土矩形截面角柱的温度场分析。运用ABAQUS软件模拟分析两面受火的钢筋混凝土矩形截面角柱的温度场形式,并研究相关的影响因素。研究表明：截面尺寸和受火时间是影响温度场分布的主要因素,而不同升温曲线对温度场分布影响较小。3.高温状态下钢筋混凝矩形截面土角柱抗剪研究。运用ABAQUS软件模拟分析钢筋混凝土矩形截面角柱在两面受火的时候产生的剪力大小,研究相关的影响因素,并且与常温状态时钢筋混凝土矩形截面角柱抗剪性能进行比较。研究表明：高温状态下,保护层厚度、截面尺寸是影响抗剪能力的主要因素；提高配筋率可以增强钢筋混凝土矩形截面柱的抗剪能力,但过高的配筋率会造成结构脆性破坏；而提高混凝土标号并不能提高钢筋混凝土矩形截面角柱的抗剪能力。4.运用C语言对常温状态下及高温状态下钢筋混凝土柱抗剪能力大小进行编程,并给出相关算例。探讨不同影响因素下,钢筋混凝土柱是否受到了破坏。本文所做的工作为今后钢筋混凝土矩形截面角柱抗剪性能深入研究、制定高温时钢筋混凝土矩形截面角柱抗剪规范提供一定的参考作用。
[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.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.5;TU375
[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.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU352.5;TU375
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