Abstract This paper presents an experimental and numerical study to examine the elasto-plastic behavior of the weak-panel type beam-column joints with RC slabs subjected to bidirectional and unidirectional loading. The effect of the RC slab on the behavior of the beam-column joints was investigated. The steel beam-column joint specimens were composed of wide-flange beams and square tube columns, and the panel zones were designed to yield before the columns and beams. The specimens failed at 0.04 rad story drift under bidirectional loading, while the specimens sustained a story drift of 0.08 rad under unidirectional loading. The existence of the RC slab led to various failure modes in this test, including the local buckling of the upper column, the weld fracture at the lower panel section, and the weld fracture at the beam bottom flange. It was worth noting that the panel-to-diaphragm weld cracks always initiated in the lower panel section and developed into severe fractures. Both the top and bottom surfaces of the slab suffered concrete crushing in the area around the column. Concrete cracks on the top surface were basically along the direction of the steel beam, while the cracks along the direction of the slab diagonal were also observed for the specimens under bidirectional loading. The RC slab increased the plastic strength of the specimens by 15%–20%. An equation was proposed to quantify the slab effect on the plastic strength of the specimens. Finite element analysis was conducted to validate the proposed equation.

中文翻译：

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双向荷载作用下钢筋混凝土板弱板梁柱节点弹塑性行为

摘要 本文提出了一种试验和数值研究，以检验在双向和单向荷载作用下带有钢筋混凝土板的弱板型梁柱节点的弹塑性行为。研究了钢筋混凝土板对梁柱节点性能的影响。钢梁柱节点试件由宽翼缘梁和方管柱组成，面板区设计为在柱和梁之前屈服。在双向加载下，试样在 0.04 rad 的楼层漂移时失效，而在单向加载下，试样的层漂移为 0.08 rad。RC板的存在导致本次试验中出现了多种失效模式，包括上柱局部屈曲、下板断面焊缝断裂、梁底翼缘焊缝断裂等。值得注意的是，面板到隔膜的焊接裂纹总是从下面板部分开始并发展成严重的断裂。楼板的顶面和底面在柱子周围的区域都遭受了混凝土压碎。顶面混凝土裂缝基本沿钢梁方向，双向加载的试件也观察到沿板对角线方向的裂缝。钢筋混凝土板使试件的塑性强度提高了 15%~20%。提出了一个方程来量化板坯对试样塑性强度的影响。进行了有限元分析以验证所提出的方程。楼板的顶面和底面在柱子周围的区域都遭受了混凝土压碎。顶面混凝土裂缝基本沿钢梁方向，双向加载的试件也观察到沿板对角线方向的裂缝。钢筋混凝土板使试件的塑性强度提高了 15%~20%。提出了一个方程来量化板坯对试样塑性强度的影响。进行了有限元分析以验证所提出的方程。楼板的顶面和底面在柱子周围的区域都遭受了混凝土压碎。顶面混凝土裂缝基本沿钢梁方向，双向加载的试件也观察到沿板对角线方向的裂缝。钢筋混凝土板使试件的塑性强度提高了 15%~20%。提出了一个方程来量化板坯对试样塑性强度的影响。进行了有限元分析以验证所提出的方程。钢筋混凝土板使试件的塑性强度提高了 15%~20%。提出了一个方程来量化板坯对试样塑性强度的影响。进行了有限元分析以验证所提出的方程。钢筋混凝土板使试件的塑性强度提高了 15%~20%。提出了一个方程来量化板坯对试样塑性强度的影响。进行了有限元分析以验证所提出的方程。