孔肋加劲钢管混凝土柱轴压受力性能有限元分析

Finite element analysis on axial compressive mechanical behavior of concrete filled steel tubular column with holes rib stiffener

普通钢管与核心混凝土粘结性能较低,构件的整体性较差,对受力性能造成一定影响。本文对钢管内壁的加劲肋进行开孔处理,使得混凝土在孔洞部位贯通粘结,形成多个剪切连接件,提高了钢管与核心混凝土的粘结作用,并有较强的拉结作用,增强了钢管的"套箍作用"以及构件的整体性。通过轴心受压有限元分析发现:孔肋加劲钢管混凝土柱的最大应力位置靠近构件中部,整个构件的内力分布更加均匀。这种新型钢管混凝土柱构造简单,较普通形式构件拥有更高的承载力与变形能力。

The poor bonding properties of ordinary steel tube and the core concrete have had less effect upon the stress properties of integral components. In this paper, the stiffening rib on the inner wall of steel pipe is opened with some holes, so as to more the concrete holed through the holes bonded, formed a plurality of shear connectors, thus effectively improving the bonding performance of steel and concrete, increasing the ＂confinement effect＂ of steel tube and the compo- nent integrity. Through the axial compression finite element analysis, it is found that： the maximum stress of concrete filled steel tubular column with holes rib stiffener should be close to the central section and the stress distribution of the component is more uniform. This new type of concrete filled steel tubular column has simple structure as compared with the ordinary form, with has higher bearing capacity and deformability.