T形截面钢管混凝土异形柱承载机理数值分析

Analysis of concrete-filled steel tubular columns with T shaped cross section

基于混凝土的塑性损伤模型和钢材的应变硬化模型,对普通T形截面钢管混凝土异形柱(CCFTTS)和双钢管焊接T形截面混凝土异形柱(DCFTTS)在轴向荷载作用下的力学性能进行了数值分析。模拟分析结果表明这两种构件都有类似的失效模式,即钢管都向外发生了屈曲变形。研究发现DCFTTS相比于CCFTTS有着较高的力学性能,因为DCFTTS对混凝土提供更高的侧向约束力。参数分析进一步表明钢管的壁厚、混凝土强度、钢管和混凝土接触面之间的摩擦系数对构件承载力的影响。

a numerical analysis is processed about mechanical property of concrete-filled steel tubular columnswith ordinary T shaped cross section （ CCFTTS） , double steel pipe welded T shaped section concrete specialshaped column（ DCFTTS） under axial load,based on the plastic-damage model for concrete and strain hardeningmodel for steel. The numerical results indicate that： these two components have similar failure modes, thatis, the deformation of the steel pipe has been out. DCFTTS columns have higher axial capacities than CCFTTSones, therefore the steel tube of DCFTTS columns can play more significant confining effect on concrete. A furtherparametric analysis indicates that the tube thickness, concrete strength and friction coefficient of tube-concreteinterface have important influences on the axial capacities.