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延性破坏是钢框架中梁柱节点最常见的破坏模式之一。目前主要通过试验方法来评价发生延性破坏钢梁的塑性变形能力,其中材料的屈强比、梁的弯矩梯度和梁柱节点的详细构造等都是重要的参数。但是在实际试验中要涵盖所有这些参数是不可能的,也是不现实的。此外,影响钢梁塑性变形能力的另一个重要的因素是加载机制。最近几年,长持时地震对结构构件的影响备受关注。长持时地震作用下,钢梁往往承受长时间的低幅循环荷载,然而,目前的试验研究中大多采用各个国家规范推荐的振幅递增加载机制。通过数值分析方法,对长持时地面运动作用下钢梁的塑性变形能力进行评估。
Ductile failure is one of the most common failure modes of beam-column joints in steel frames. At present, the plastic deformation capacity of ductile failure of steel beams is mainly evaluated by the test method. Among them, the yield strength ratio, the bending moment gradient of the beam and the detailed structure of the beam-column joints are all important parameters. However, it is impossible and impossible to cover all these parameters in practical experiments. In addition, another important factor affecting the plastic deformation capacity of steel beams is the loading mechanism. In recent years, the impact of long-lasting earthquakes on structural components has drawn much attention. However, most of the current experimental studies use the incremental amplitude loading mechanism recommended by various national codes. Through numerical analysis, the plastic deformation ability of steel beams under long-term ground motion is evaluated.