基于统一理论的矩形钢管混凝土构件性能研究

发布时间：2018-01-02 19:38

本文关键词：基于统一理论的矩形钢管混凝土构件性能研究　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于矩形钢管混凝土构件具有外形美观、与梁节点构造简单方便、能够有效地提高延性、能够提供有力的强弱轴等优点,在工程中得到利用的机会越来越多,对其也有了越来越深的探讨。不过现在统一理论的研究主要是圆形截面和方形截面构件,对于长宽比较大的矩形构件的研究较少。而且由于目前已有理论对长宽比较大的矩形钢管混凝土的套箍效应考虑不够准确,所以长宽比较大的矩形钢管混凝土需要进行深入研究。通过静力分析得到了矩形钢管混凝土的钢管的环向受力和核心混凝土受侧压力区分布规律。然后根据核心混凝土有限元模型和受力分析,假设了核心混凝土区域的抛物线方程,推导出核心混凝土受套箍效应的面积。而且在方形钢管混凝土轴压构件强度承载力公式的基础上,通过假设套箍效应影响系数,最终得到适用于矩形钢管混凝土轴压短柱强度承载力的实用公式。考虑管内混凝土对钢管稳定性能的有利影响,利用数据库的试验结果回归得到更加经济的稳定系数公式,并利用修正后的轴压强度承载力公式,得到矩形钢管混凝土长柱的稳定承载力公式,并用试验数据对得到的公式进行了验证。在统一理论的基础上,根据极限平衡理论,分别得到矩形钢管混凝土绕长轴和短轴弯曲的极限抗弯承载力计算公式。然后在已有的方形钢管混凝土抗弯承载力计算公式的基础上通过公式拟合,得出适合于长宽比较大的矩形钢管混凝土抗弯承载力实用公式。在统一理论的指导下,利用已推导出的稳定承载力公式和抗弯承载力公式,通过对矩形规程中相关方程的修改,得到了矩形钢管混凝土压弯构件相关方程。通过国际组合结构协会公布统计的试验数据库和欧洲规范4来验证钢管混凝土结构统一理论,验证表明统一理论对于长宽比大于1.5的矩形钢管混凝土构件不够准确,对于长宽比较小的构件的误差较小。并利用数据库的试验数据对本文推导出的矩形钢管混凝土轴压短柱强度承载力公式、长柱稳定承载力公式、压弯相关方程都进行了验证,证明了各个公式的正确性。
[Abstract]:Because the rectangular concrete-filled steel tube members have the advantages of beautiful appearance, simple and convenient construction with the beam joint, can effectively improve the ductility, can provide a strong and weak axis, and so on, it has more and more opportunities to be used in engineering. It has also been discussed more and more deeply, but now the research of unified theory is mainly about circular section and square section. There is little research on rectangular members with large length and width, and the current theory is not accurate enough to consider the hoop effect of rectangular concrete-filled steel tube with large length and width. Therefore, the concrete filled rectangular steel tubes with large length and width need to be studied deeply. Through the static analysis, the circular force and the distribution of the core concrete under lateral pressure are obtained, and then according to the core of the concrete filled steel tube, the distribution of the concrete in the concrete filled rectangular steel tube is obtained. Finite element model and stress analysis of concrete. The parabola equation of the core concrete region is assumed, and the area of the core concrete subjected to hoop effect is deduced, and the strength bearing capacity formula of the square concrete-filled steel tube members under axial compression is derived. By assuming the influence coefficient of hoop effect, a practical formula for the strength bearing capacity of rectangular concrete-filled steel tubular columns under axial compression is obtained, and the favorable influence of concrete in pipe on the stability of steel tube is considered. A more economical formula of stability coefficient is obtained by regression of the test results of the database, and the formula of stability bearing capacity of rectangular concrete-filled steel tubular columns is obtained by using the modified formula of axial compression strength bearing capacity. The formula is verified by the experimental data. Based on the unified theory, the limit equilibrium theory is used. The calculation formulas of ultimate flexural capacity of concrete filled rectangular steel tube (CFST) around long axis and short axis are obtained respectively. Then the formula is fitted on the basis of the existing formulas for calculating the flexural capacity of concrete filled rectangular steel tube (CFST). A practical formula for bending bearing capacity of concrete filled rectangular steel tubes with large length and width is obtained. Under the guidance of the unified theory, the formula of stable bearing capacity and the formula of bending bearing capacity have been derived. By modifying the relevant equations in the rectangular rules. The relevant equations of concrete-filled rectangular steel tubular members are obtained. The unified theory of concrete-filled steel tubular structures is verified by the test database published by the International Association of Composite structures and European Code 4. The results show that the unified theory is not accurate for concrete filled rectangular steel tube members whose aspect ratio is greater than 1.5. For the members with small length and width, the error is small, and the formula of strength bearing capacity of rectangular concrete-filled steel tubular columns under axial compression, and the formula of stability bearing capacity of long columns are deduced by using the test data of the database. The relevant equations of compression and bending are verified, and the correctness of each formula is proved.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

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