薄壁方钢管混凝土柱劲化设计及轴压性能探讨

Stiffened Design and Experimental Study of Axial Compressive Performance on Thin-walled CFT Square Columns

对于薄壁方形钢管混凝土柱,有效且经济地提高柱的承载力、刚度和延性,增强其抵抗局部屈曲的能力是目前的一项重要研究课题。据此,进行8个薄壁方形钢管混凝土轴压试件的研究,比较普通薄壁钢管混凝土柱与劲化薄壁钢管混凝土柱的轴压极限承载力、延性性能、局部屈曲模态及相应耗钢量,研究表明:劲化设置在增加较少用钢量的情况下,使钢管壁对核心混凝土的约束作用相对于普通钢管混凝土柱和单纯加设约束拉杆的钢管混凝土柱更趋均匀,提高了整体约束效应,混凝土强度得以提高,本构关系明显改善。从而增加了钢管混凝土柱的轴压承载力和延性,改变了钢管的局部屈曲变形状态,其实用效益与经济效益极其可观,具有良好推广价值。

Currently for the thin-walled rectangular （square） CFT columns, it is an important research subject to increase its stiffness and ductility, enhance its resistance to local buckling capability effectively and economically. Accordingly, researches on axial compression performance of 8 thin-walled square CFT columns are undertaken to compare ultimate bearing capacity, ductility, local buckling mode of stiffened concrete filled thin-walled steel tubular column and corresponding steel consumption with ordinary concrete filled thin-walled steel tube. Compared with ordinary CFT column and CFT column only setted with binding bars, researches show that stiffened set can make confinement effect of the tubular wall to core concrete more uniformly in less enhancement of steel consumption situation. It improves the overall binding effect to improve the strength of concrete, thus constitutive relationship was improved. So that axial compression bearing capacity and ductility of＆amp;nbsp;CFT column are increased, deformation state of local buckling are changed, its benefit and the economic benefit is considerable with good promotion value.