考虑抗滑移刚度的钢管混凝土柱的荷载传递

提出了钢管混凝土抗滑移刚度的概念，给出了均布荷载和集中荷载作用下钢管混凝土柱的轴力、界面剪应力、界面相对滑移等的解析解，发现在考虑滑移的情况下，钢管混凝土柱的轴压刚度保持不变。对国内进行的39个方钢管混凝土、29个圆钢管混凝土试件的粘结滑移试验进行分析，根据试验数据汇总得出钢管混凝土界面抗滑移刚度的数值。利用ANSYS软件建立钢管混凝土柱模型，分析了顶板厚度对混凝土应力分布和柱轴压刚度的影响，分析结果表明，顶板在增强钢管和核心混凝土共同工作上有着重要作用。

LOAD TRANSFER IN CONCRETE-FILLED STEEL TUBULAR COLUMNS CONSIDERING SLIP STIFFNESS

The slip stiffness of concrete-filled steel tubes is proposed. The axial force, interface shear stress and slip formulas of concrete-filled steel tubular columns under uniformly distributed and concentrated loads are obtained. It is found that the axial compression stiffness of concrete-filled steel tube remains unchanged in consideration of slip. The results of the bond-slip tests of 39 concrete-filled square steel tube specimens and 18 concrete-filled circular steel tube specimens are analyzed and the values of interface slip stiffness are obtained. Concrete-filled steel tubular column models are established in ANSYS. The influence of the thickness of the cap on the stress distribution of concrete and axial compression stiffness of column is analyzed. The analysis results show that the cap on top is important to guarantee the composite action between the steel section and the concrete core.