CFST柱和RC柱偏压性能比较

Comparison in performances of CFST and RC columns subjected to eccentric load

为了研究钢管混凝土柱在偏压荷载下的力学性能,对已有的偏压荷载钢管混凝土柱进行了有限元模拟,并与试验结果进行了比较.在此基础上,分别模拟了同等条件下钢管混凝土柱和钢筋混凝土柱的受力性能,对比分析了它们的破坏形态、承载力、挠度变形等力学性能.研究结果表明:相同条件下,钢管混凝土柱比钢筋混凝土柱更具有延性,钢管混凝土柱轴力比钢筋混凝土柱高约25%,弯矩高约40%;最大荷载时,钢管混凝土柱跨中截面的挠度为钢筋混凝土柱的1.67倍,极限荷载时为2.30倍;钢管混凝土柱和钢筋混凝土柱承载力随着偏心率的增大而减小,与构件性质无关.长细比对构件破坏性质有明显影响.

In order to study the mechanical properties of concrete-filled steel tubular( CFST) columns subjected to eccentric load,the CFST columns subjected to eccentric load in the previous operation was simulated with the finite element method. The calculated results were compared with the test ones. On this basis,the mechanical properties of CFST column and reinforced concrete( RC) column under the same condition were respectively simulated,and their mechanical properties of failure modes,bearing capacity and deflection deformation were analyzed and compared. The results showthat under the same condition,the CFST column is more ductile than the RC column. The axial force and bending moment of CFST are25% and 40% higher than those of RC column,respectively. The deflection of CFST column on the mid-span section is 1. 67 times as that of RC column under the maximum load and 2. 30 times under the ultimate load. The bearing capacity of CFST and RC columns decreases with increasing the eccentricity,which has no relation with the properties of component. M oreover,the slenderness ratio has obvious effect on the failure characteristic of component.