内置型钢剪力架方钢管混凝土板柱节点性能研究

发布时间：2018-05-11 14:59

本文选题：钢管混凝土 + 板柱节点　；参考：《重庆大学》2016年硕士论文

【摘要】：板柱结构具有降低结构层高、施工方便、提高经济效益等优点,但由于节点区域在承受重力荷载和水平荷载时易发生脆性破坏,板柱节点的冲切问题和抗震性能一直是国内外诸多学者不断研究的重点。钢管混凝土柱可以提高构件的承载力,改善结构的延性和韧性,在水平荷载反复作用下表现出更好的耗能能力,保证结构在地震作用下具有良好的抗震性能。为了将板柱结构和钢管混凝土两者的优点结合起来,本文研究了型钢剪力架这种连接方式,对节点抗冲切性能和延性进行改善。采用有限元分析对型钢剪力架作用机理进行分析研究,对型钢剪力架不同参数对板柱节点性能的影响进行分类研究,通过计算数据拟合得到内置型钢剪力架方钢管混凝土板柱节点抗冲切计算公式。本文首先对板柱节点的破坏形态做了分析总结,阐述了节点的冲切破坏时的作用机理,并提出了型钢剪力架作为提高板柱节点冲切性能的可行性,对比分析了不同的冲切计算理论和在水平荷载作用下的计算方法。接着,简单介绍了有限元分析程序和材料本构,通过对比国外现场试验结果,说明采用型钢剪力架可以有效提高板柱节点的抗冲切承载力,同时验证了采用有限元模拟的可靠性。然后,重点对承受重力荷载作用下的内置型钢剪力架板柱节点进行冲切性能研究,加入型钢剪力架后,板的抗冲切能力大幅提高,延性也随之改善,破坏形式从冲切破坏转变为弯曲破坏;随着剪力架长度和腹板面积增大,冲切承载力随之提高,建议型钢剪力架长度不宜小于02(b?2h),型钢剪力架高度为0h2。根据75组抗冲切计算结果,在我国混凝土规范的基础上,综合考虑型钢剪力架长度、腹板面积和板厚的影响,拟合得到内置型钢剪力架方钢管混凝土板柱节点的抗冲切承载力计算公式。最后,对板柱节点的抗震性能做了定性评估,对型钢剪力架进行不同参数分析,说明采用钢管混凝土柱可以有效提高板柱结构的抗侧能力,但型钢剪力架的长度和高度在超过一定程度后将影响节点延性。
[Abstract]:The slab-column structure has the advantages of reducing the height of the structure, convenient construction and increasing economic benefit. However, the brittle failure is easy to occur in the joint area when it is subjected to gravity load and horizontal load. The punching shear problem and seismic behavior of slab-column joints have been the focus of many scholars at home and abroad. Concrete-filled steel tubular columns can increase the bearing capacity of members, improve the ductility and toughness of the structure, show better energy dissipation capacity under repeated horizontal loads, and ensure that the structure has good seismic performance under earthquake. In order to combine the advantages of slab-column structure and concrete-filled steel tube (CFST), this paper studies the connection mode of SSS, and improves the impact shear behavior and ductility of joints. The finite element analysis is used to analyze the mechanism of section steel shear frame, and the influence of different parameters of profile steel shear frame on the performance of plate column joint is classified. By fitting the calculated data, a formula for calculating the punching shear of concrete filled square steel tubular slab-column joints with built-in steel shear frame is obtained. In this paper, the failure pattern of slab-column joint is analyzed and summarized, and the mechanism of punching failure is expounded, and the feasibility of improving punching performance of slab-column joint by steel shear frame is put forward. Different punching calculation theories and calculation methods under horizontal load are compared and analyzed. Then, the finite element analysis program and material constitutive model are briefly introduced. By comparing the results of field tests abroad, it is proved that the punching shear capacity of slab-column joints can be improved effectively by using the steel shear frame. At the same time, the reliability of finite element simulation is verified. Then, the punching behavior of the slab-column joints of the built-in steel shear frame subjected to gravity load is studied. The punching ability of the plate is greatly improved and the ductility is improved with the addition of the steel shear frame. With the increase of shear frame length and web area, the punching capacity increases. It is suggested that the length of section steel shear frame should not be less than 02mb / h and the height of section steel shearframe should be 0h2.The failure mode is changed from punching failure to bending failure, and the punching capacity increases with the increase of shear frame length and web area. According to the calculation results of 75 groups of punching shear, on the basis of the concrete code of our country, the influence of length, web area and thickness of steel shear frame is considered synthetically. The formula for calculating the punching shear capacity of concrete filled square steel tubular slab-column joints with built-in steel shear frame is obtained by fitting. Finally, the seismic behavior of slab-column joints is evaluated qualitatively, and the different parameters of steel shear frame are analyzed. The results show that concrete filled steel tubular columns can effectively improve the lateral resistance of slab-column structures. However, the ductility of the joints will be affected by the length and height of the steel shear frame.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU398.9

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