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与传统的钢管混凝土柱相比,中空钢管混凝土(CFDST)柱具有很多优点,诸如自重轻和良好的循环性能。CFDST柱可能被用于桥梁,高层建筑,高架桥和输电塔结构中。内外钢管将承担来自上部结构和浇筑的湿混凝土的初始荷载。由这些初始荷载造成的钢管初应力和变形会影响CFDST构件的性能。因此,对外钢管单独承担初始荷载和内外钢管同时承担初始荷载时,CFDST柱的轴力性能进行讨论。建立通用的有限元模型预测钢管负荷时CFDST柱的性能。通过承担初始荷载和不承担初始荷载的CFDST柱的试验结果对该有限元模型进行验证。讨论初始荷载水平、长细比、空心率和材料强度对轴向强度的影响。最后,给出初始荷载下的CFDST柱的极限强度计算公式。
Hollow CFST columns have many advantages over traditional CFST columns, such as light weight and good cycling performance. CFDST columns may be used in bridges, high-rise buildings, viaduct and transmission tower structures. The inner and outer tubes will carry the initial load from the superstructure and the poured wet concrete. The initial stress and deformation of the steel pipe due to these initial loads can affect the performance of the CFDST components. Therefore, when the external steel pipe alone undertakes the initial load and the internal and external steel pipes bear the initial load at the same time, the axial force performance of the CFDST column is discussed. Establish a general finite element model to predict the performance of CFDST column when the steel pipe is loaded. This finite element model was validated by the experimental results of the CFDST column with initial load and no initial load. The effect of initial load, slenderness ratio, hollowness and material strength on axial strength was discussed. Finally, the formula for calculating the ultimate strength of CFDST column under initial load is given.