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进行了11根多室式T形钢管混凝土柱的双向偏压试验,其破坏形态为整体弯曲变形以及局部屈曲破坏。对试件的应变分布进行了分析,其截面符合平截面假定。通过有限元软件建立计算模型,数值模拟结果与试验结果吻合很好。在此基础上,通过固定偏心角,改变偏心距的方法,得出了试件的极限荷载N与其对应的弯矩M的关系曲线。改变偏心角可做出试件的破坏曲面。通过判断试件受力对应的坐标是否在曲面包络的范围内,可知某一受力情况下试件破坏与否。
Eleven multi-chamber T-shaped CFST columns were subjected to bidirectional biasing tests, and their failure modes were overall bending deformation and partial buckling failure. The strain distribution of the specimen was analyzed, and its cross-section was in accordance with the assumption of flat section. Through the finite element software to establish the calculation model, the numerical simulation results are in good agreement with the experimental results. On this basis, the relationship between the ultimate load N and the corresponding moment M of the specimen is obtained by fixing the eccentric angle and changing the eccentricity. Change the eccentric angle can make the specimen destruction surface. By judging whether the coordinate corresponding to the stress of the specimen is within the range of the envelope of the curve, it can be known whether the specimen is damaged or not under a certain stress.