【摘要】 提出一种利用低屈强比钢实现住宅钢结构节点梁翼缘削弱的新方法。采用非线性静动态有限元方法,分析和比较梁翼缘材料削弱前后节点的极限承载能力和滞回性能,研究梁翼缘削弱位置和削弱长度等对节点承载能力、塑性铰发生位置、节点抗震性能等的影响。分析表明:梁翼缘材料削弱会造成节点承载能力小幅度降低,并使节点局部应力重分布,实现塑性铰外移;梁翼缘削弱后,节点的滞回曲线更为饱满,节点耗能性能和延性性能增强;梁翼缘削弱位置和削弱长度的变化对节点承载能力和抗震性能都有一定影响,需要对削弱参数进行综合考虑。更多还原

【Abstract】 A novel method is proposed to realize beam flange reduction in steel constructions with low yielding-strength ratio steel. By adopting the nonlinear static-dynamic finite element method, it is conducted analysis and comparison of the bearing capacity and hysteretic behavior in connection with or without a material-reduced beam section.The effects of the parameters, such as location and length of material-reduced beam flange, on the bearing capacity, plastic hinge position and seismic performance of the weakened flange are studied. The stress distribution in local regions is changed, while the bearing capacity decreases a little, so that external movement of the plastic hinge can be successfully realized. With material reducing beam flange, the hysteresis curve of the connection is better-shaped, and both the corresponding capacity of consuming energy and ductility are also improved. Comprehensive considerations of the reduction parameters are necessary because changes in location and length of material-reduced beam flange have a certain effect on the bearing capacity and aseismic behavior of the connections.更多还原