在低周反复荷载作用下方钢管混凝土柱承载性能的有限元分析
发布时间：2019-05-08 05:40
【摘要】：随着现代经济地飞速发展，许多高楼大厦、工业厂房、高架桥梁也都磅礴升起。钢管混凝土柱的应用也越来越广泛，日益受到许多研究学者的重视和研究。我国在早期已经尝试着开始使用钢管混凝土柱，其原因：周期短，节省了支拆模板的时间；钢筋用量至少可以节省一半；承载力高；耐火性能有了逐步地提高。但是，对于方钢管混凝土柱的理论和试验研究却比较少，尤其是在方钢管混凝土柱的抗震性能方面。所以说，研究方钢管混凝土柱的延性和抗震性能显得极其重要。 本文通过大型的有限元分析软件ABAQUS来模拟方钢管混凝土柱在低周反复荷载作用下承载性能的有限元分析，依据有限元的基本思想及求解方法，建立了6个基本试件，研究方钢管混凝土柱在低周反复荷载作用下的滞回性能和延性，在前人所做的基础上进行了数值模拟，分析得出了构件的滞回曲线，并将实验值和数值模拟值进行了对比分析，得出数值模拟的可行性。然后设置了9个试件，分别从轴压比、长细比、套箍系数这3个影响因素来考虑分析方钢管混凝土柱的滞回曲线和骨架曲线，总结出：得到的滞回曲线图形比较饱满，并没有明显的捏缩现象；随着轴压比的逐渐增大，骨架曲线呈现出上升的趋势，表现出了比较好的塑性能力和抗震性能；随着长细比的逐渐增大，骨架曲线呈现出上升的趋势；随着套箍系数的逐渐增大，骨架曲线也呈现出上升的趋势。然后在通过正交对比分析方法，研究这3个影响因素对延性系数的影响程度，发现轴压比对方钢管混凝土柱的延性系数影响最大，，其次是套箍系数，最后是长细比。最后用SPSS多元非线性回归分析，推导出轴压比、长细比、套箍系数这3个影响因素对延性系数的回归方程，并且还做了F分布的检验，得出在0.01水平上显著。 通过本文的分析，可对今后高层建筑或者是复杂的工业厂房结构对方钢管混凝土柱抗震性能的要求提供理论分析依据。
[Abstract]:With the rapid development of modern economy, many high-rise buildings, industrial buildings and viaducts have also risen majestically. The application of concrete filled steel tube (CFST) column is becoming more and more extensive, which has been paid more and more attention by many scholars. China has tried to use concrete-filled steel tube columns in the early stage because of its short period, saving the time of breaking down the formwork, saving at least half of the amount of steel bars, high bearing capacity, and improving the fire resistance step by step. However, there are few theoretical and experimental studies on concrete-filled square steel tube columns, especially on the seismic behavior of concrete-filled square steel tube columns. Therefore, it is very important to study the ductility and seismic behavior of concrete filled square steel tube columns. In this paper, the finite element analysis of concrete-filled square steel tubular columns under low cyclic loading is simulated by large-scale finite element analysis software ABAQUS. According to the basic idea and solving method of finite element, six basic specimens are established. The hysteretic behavior and ductility of concrete filled square steel tube (CFST) columns under low cyclic loading are studied. Based on the previous results, the hysteretic curves of the concrete filled square steel tubular columns are obtained, and the experimental values and numerical simulation values are compared and analyzed. The feasibility of numerical simulation is obtained. Then nine specimens were set up, and the hysteretic curves and skeleton curves of concrete filled square steel tube columns were analyzed from the three influencing factors of axial compression ratio, slenderness ratio and hoop coefficient respectively. The results showed that the hysteresis curves were full, and the results showed that the hysteretic curves of concrete filled square steel tubular columns were full, and the hysteresis curves of concrete filled steel tubular columns were analyzed. There is no obvious contraction phenomenon; With the increase of axial compression ratio, the skeleton curve shows an upward trend, showing a better plasticity and seismic performance, and with the increasing of the slenderness ratio, the skeleton curve shows an upward trend. With the increase of hoop coefficient, the skeleton curve also showed an upward trend. Then by means of orthogonal comparative analysis, the influence degree of these three factors on ductility coefficient is studied. It is found that axial compression ratio has the greatest influence on ductility coefficient of concrete-filled steel tube columns, followed by hoop coefficient, and finally the slenderness ratio. Finally, the regression equations of axial compression ratio, slenderness ratio and hoop coefficient for ductility coefficient are derived by means of SPSS multivariate nonlinear regression analysis, and the test of F distribution is also made, and the results show that it is significant at 0. 01 level. Through the analysis in this paper, we can provide a theoretical basis for the seismic performance of concrete-filled steel tubular columns in high-rise buildings or complex industrial workshop structures in the future.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
本文编号：2471659
[Abstract]:With the rapid development of modern economy, many high-rise buildings, industrial buildings and viaducts have also risen majestically. The application of concrete filled steel tube (CFST) column is becoming more and more extensive, which has been paid more and more attention by many scholars. China has tried to use concrete-filled steel tube columns in the early stage because of its short period, saving the time of breaking down the formwork, saving at least half of the amount of steel bars, high bearing capacity, and improving the fire resistance step by step. However, there are few theoretical and experimental studies on concrete-filled square steel tube columns, especially on the seismic behavior of concrete-filled square steel tube columns. Therefore, it is very important to study the ductility and seismic behavior of concrete filled square steel tube columns. In this paper, the finite element analysis of concrete-filled square steel tubular columns under low cyclic loading is simulated by large-scale finite element analysis software ABAQUS. According to the basic idea and solving method of finite element, six basic specimens are established. The hysteretic behavior and ductility of concrete filled square steel tube (CFST) columns under low cyclic loading are studied. Based on the previous results, the hysteretic curves of the concrete filled square steel tubular columns are obtained, and the experimental values and numerical simulation values are compared and analyzed. The feasibility of numerical simulation is obtained. Then nine specimens were set up, and the hysteretic curves and skeleton curves of concrete filled square steel tube columns were analyzed from the three influencing factors of axial compression ratio, slenderness ratio and hoop coefficient respectively. The results showed that the hysteresis curves were full, and the results showed that the hysteretic curves of concrete filled square steel tubular columns were full, and the hysteresis curves of concrete filled steel tubular columns were analyzed. There is no obvious contraction phenomenon; With the increase of axial compression ratio, the skeleton curve shows an upward trend, showing a better plasticity and seismic performance, and with the increasing of the slenderness ratio, the skeleton curve shows an upward trend. With the increase of hoop coefficient, the skeleton curve also showed an upward trend. Then by means of orthogonal comparative analysis, the influence degree of these three factors on ductility coefficient is studied. It is found that axial compression ratio has the greatest influence on ductility coefficient of concrete-filled steel tube columns, followed by hoop coefficient, and finally the slenderness ratio. Finally, the regression equations of axial compression ratio, slenderness ratio and hoop coefficient for ductility coefficient are derived by means of SPSS multivariate nonlinear regression analysis, and the test of F distribution is also made, and the results show that it is significant at 0. 01 level. Through the analysis in this paper, we can provide a theoretical basis for the seismic performance of concrete-filled steel tubular columns in high-rise buildings or complex industrial workshop structures in the future.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9
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