外包钢筋混凝土加固轴心受压钢柱正截面力学性能研究
发布时间：2018-10-08 19:30
【摘要】：近年来,钢结构以其优越的力学性能越来越多的被使用在实际工程中,但随着钢结构服役时间的增加,某些钢构件的承载力会出现不同程度的下降,因此对钢结构构件的加固补强是非常重要的。本文采用试验研究、理论分析以及有限元模拟相结合的方法,系统研究了外包钢筋混凝土加固轴心受压钢柱的力学性能。最后,基于已有试验数据和理论,通过理论分析和有限元模拟探讨了外包碳纤维混凝土加固轴心受压钢柱的力学性能和承载力计算公式。主要内容有:通过对未负载下加固钢柱以及负载下加固钢柱的轴心受压试验,研究外包钢筋混凝土加固轴心受压钢柱的力学性能,型钢、混凝土和钢筋的应力发展情况,以及初始负载大小、混凝土强度和型钢强度对加固构件受力性能的影响。试验结果表明:外包钢筋混凝土的加固方法可以显著提高原钢构件的承载能力和刚度;加固后构件的承载力与混凝土强度和型钢强度成正比,与型钢的初始负载大小成反比,并通过截面强度换算法推导出了外包钢筋混凝土加固轴心受压钢柱正截面承载力计算公式。基于试验数据,建立ABAQUS有限元计算模型研究型钢初始负载、外包混凝土强度、核心型钢强度、截面尺寸等不同参数对于外包混凝土加固轴心受压钢柱正截面承载力的影响。基于已有的试验数据和相关结论建立ABAQUS有限元计算模型来探讨外包碳纤维混凝土加固轴心受压钢柱的力学性能、加固后构件的承载力,并对型钢初始负载、核心型钢强度、截面尺寸等不同参数对于外包混凝土加固轴心受压钢柱正截面承载力的影响进行分析对比,得出加固后构件的承载力与型钢强度和截面尺寸的大小成正比,与型钢的初始负载大小成反比。在碳纤维体积率合适的情况下采用碳纤维混凝土加固轴心受压钢柱比采用普通混凝土加固轴心受压钢柱的承载力有一定程度的提高,但提高幅度不是很大。
[Abstract]:In recent years, more and more steel structures have been used in practical projects for their superior mechanical properties. However, with the increase of service time of steel structures, the bearing capacity of some steel members will decrease in varying degrees. Therefore, it is very important to strengthen the steel structure. In this paper, the mechanical properties of axially compressed steel columns strengthened with reinforced concrete are systematically studied by means of experimental study, theoretical analysis and finite element simulation. Finally, based on the existing experimental data and theory, the formulas of mechanical properties and bearing capacity of steel columns strengthened with CFRP are discussed by theoretical analysis and finite element simulation. The main contents are as follows: the mechanical properties, stress development of section steel, concrete and steel bar are studied through axial compression tests of steel columns strengthened with unloaded steel columns and steel columns strengthened with steel columns under load. The effects of initial load, concrete strength and steel strength on the mechanical behavior of reinforced members are also discussed. The experimental results show that the reinforced concrete reinforcement method can significantly improve the bearing capacity and stiffness of the original steel members, and the bearing capacity of the strengthened members is in direct proportion to the strength of concrete and the strength of the section steel, and inversely proportional to the initial load of the section steel. The formula for calculating the normal section bearing capacity of steel columns strengthened with reinforced concrete is derived by the method of section strength conversion. Based on the experimental data, a ABAQUS finite element model was established to study the effect of different parameters such as initial load, strength of concrete, strength of core steel and size of section on the bearing capacity of steel columns under axial compression. Based on the existing experimental data and related conclusions, a ABAQUS finite element model is established to study the mechanical properties of steel columns strengthened with CFRP, the bearing capacity of strengthened members, and the initial load and strength of core steel. The effect of different parameters such as section size on the bearing capacity of axial compression steel columns strengthened with concrete is analyzed and compared. The results show that the bearing capacity of strengthened members is proportional to the strength and size of section steel. It is inversely proportional to the initial load of the section steel. When the volume ratio of carbon fiber is suitable, the bearing capacity of steel columns strengthened with carbon fiber reinforced concrete is improved to some extent than that of steel columns strengthened by ordinary concrete, but the extent of improvement is not very large.
【学位授予单位】：沈阳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
本文编号：2258003
[Abstract]:In recent years, more and more steel structures have been used in practical projects for their superior mechanical properties. However, with the increase of service time of steel structures, the bearing capacity of some steel members will decrease in varying degrees. Therefore, it is very important to strengthen the steel structure. In this paper, the mechanical properties of axially compressed steel columns strengthened with reinforced concrete are systematically studied by means of experimental study, theoretical analysis and finite element simulation. Finally, based on the existing experimental data and theory, the formulas of mechanical properties and bearing capacity of steel columns strengthened with CFRP are discussed by theoretical analysis and finite element simulation. The main contents are as follows: the mechanical properties, stress development of section steel, concrete and steel bar are studied through axial compression tests of steel columns strengthened with unloaded steel columns and steel columns strengthened with steel columns under load. The effects of initial load, concrete strength and steel strength on the mechanical behavior of reinforced members are also discussed. The experimental results show that the reinforced concrete reinforcement method can significantly improve the bearing capacity and stiffness of the original steel members, and the bearing capacity of the strengthened members is in direct proportion to the strength of concrete and the strength of the section steel, and inversely proportional to the initial load of the section steel. The formula for calculating the normal section bearing capacity of steel columns strengthened with reinforced concrete is derived by the method of section strength conversion. Based on the experimental data, a ABAQUS finite element model was established to study the effect of different parameters such as initial load, strength of concrete, strength of core steel and size of section on the bearing capacity of steel columns under axial compression. Based on the existing experimental data and related conclusions, a ABAQUS finite element model is established to study the mechanical properties of steel columns strengthened with CFRP, the bearing capacity of strengthened members, and the initial load and strength of core steel. The effect of different parameters such as section size on the bearing capacity of axial compression steel columns strengthened with concrete is analyzed and compared. The results show that the bearing capacity of strengthened members is proportional to the strength and size of section steel. It is inversely proportional to the initial load of the section steel. When the volume ratio of carbon fiber is suitable, the bearing capacity of steel columns strengthened with carbon fiber reinforced concrete is improved to some extent than that of steel columns strengthened by ordinary concrete, but the extent of improvement is not very large.
【学位授予单位】：沈阳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU391
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