L形钢管混凝土组合柱抗震性能分析及水平承载力设计方法

为研究不同构造参数对L形双板连接钢管混凝土组合柱(LCFST-D柱)抗震性能的影响规律,通过建立有限元模型并与已有试验结果进行对比,在验证模型合理准确的基础上,对轴压比、钢管截面尺寸、宽厚比、连接板厚度、长细比、混凝土及钢材强度进行参数化分析。结果表明:轴压比小于0.6时,提高轴压比可以适当提高峰值荷载;随着轴压比的继续增大,峰值荷载都降低;单肢截面尺寸的增加,可以明显提高承载力、延性、耗能能力和极限变形能力;随着长细比的增加,承载力急剧降低,但耗能能力提高;连接板厚度的减小可以提高耗能能力。水平承载力设计公式预测值与试验值吻合良好,平均误差小于6%。

Seismic Performance and Dearing Capacity Celculation Method of L-shaped Columns composed of Concrete-Filled Steel Tube Mono-Columns connected by Double Vertical Steel Plates

In order to study the influence of different structural parameters on the seismic performance of L-shaped columns composed of concrete-filled steel tube mono-columns connected by double vertical steel plates (LCFST-D columns), the finite element model was established and compared with the experimental results. On the basis of verifying the rationality and accuracy of the finite element model, parametric analysis about axial compression ratio, section size of steel tube, width-thickness ratio, thickness and slenderness ratio of the connecting plate, concrete strength and steel strength were carried out. The results show that when the axial compression ratio is less than 0.6, the peak force can be increased appropriately by increasing the axial compression ratio. With the increase of the axial compression ratio, the peak force decreased; With the increase of the size of the mono-column section, the peak force, ductility, energy dissipation capacity and ultimate deformation capacity can be significantly improved; With the increase of slenderness ratio, the bearing capacity decreases sharply but the energy dissipation capacity increases. The energy dissipation capacity can be improved by reducing the thickness of the connecting plate. The predicted values of the design formula of horizontal peak force was in good agreement with the experimental values, and the average error is less than 6%.