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为了研究不同截面形状垫块作用下圆钢管混凝土柱的局部承压性能,进行了14个试件的试验研究,考察了垫块截面形状、局部承压面积比和端板厚度对局部承压圆钢管混凝土柱破坏形态、荷载-变形曲线及承载力的影响。结果表明,垫块截面形状对局部承压圆钢管混凝土柱破坏形态的影响较小,但方形垫块作用试件的承载力和荷载-变形曲线的初始斜率略高于圆形垫块作用试件。在确定钢材和核心混凝土本构模型的基础上,建立有限元模型对局部承压圆钢管混凝土柱的力学性能进行了模拟,总体上模拟结果与试验结果符合较好。最后,根据研究结果修正了以往圆钢管混凝土柱局部承压承载力的计算方法。
In order to study the local pressure-bearing performance of CFST columns with different cross-sectional shape of block, the experimental study of 14 specimens was carried out. The effects of cross-sectional shape, local pressure area ratio and end plate thickness on the local bearing pressure circle Effect of Failure Mode, Load - Deformation Curve and Bearing Capacity of Concrete Filled Steel Tubes. The results show that the cross-sectional shape of the block has little effect on the failure modes of the CFST with partially confined CFST. However, the initial slope of the bearing capacity and load-deformation curve of the square block is slightly higher than that of the circular block . On the basis of determining the constitutive model of steel and core concrete, the finite element model is established to simulate the mechanical properties of CFST columns with partially confined CFST. The overall simulation results are in good agreement with the experimental results. Finally, according to the research results, the calculation method of the local bearing capacity of CFST columns is modified.