通过对6根方中空夹层钢管混凝土试件在双向偏压受力状态下力学性能的试验,以研究长细比、偏心距和偏心角对试件力学性能的影响。试验结果表明:试验过程中构件变形基本符合平截面假定;长细比和偏心距越大,承载力越小;偏心角对构件的荷载-变形关系曲线的影响不大。最后,采用纤维模型法编制程序,对双向偏压构件的荷载-变形关系进行计算,计算结果与试验结果符合较好。 The mechanical properties of 6 concrete-filled square CFST specimens under biaxial bias were tested to study the effects of slenderness ratio, eccentricity and eccentricity on the mechanical properties of specimens. The experimental results show that the deformation of the members is basically consistent with the assumption of flat section during the test. The larger the slenderness ratio and eccentricity, the smaller the bearing capacity. The eccentric angle has little effect on the load-deformation curve of the members. Finally, the program of fiber model is used to calculate the load-deformation relationship of the bi-directional biasing members. The calculation results are in good agreement with the experimental results.