建筑结构学报2025，Vol.46Issue(4)：129-139,11.DOI:10.14006/j.jzjgxb.2024.0381
腹板开孔的钢框架梁-柱节点抗连续倒塌研究
Study on progressive collapse resistance of steel frame beam-column joints with web openings
摘要
Abstract
To enhance the progressive collapse resistance of steel frame structures and fully utilize the catenary action,beam-column joints with web openings were improved by introducing reinforcing plates.Through Pushdown loading tests and numerical simulations,the failure modes,load-displacement curves,and deformation behaviors of the joints with reinforcing plates were analyzed and compared with traditional joints.The results indicate that the joints with reinforcing plates significantly improve both load-bearing and deformation capacities compared to the traditional joints,while maintaining the characteristic of plastic hinge relocation.During the elastic phase,the reinforcing plate remains in a bending state.When entering the plastic phase,the reinforcing plate gradually straightens and contributes to axial load bearing,resulting in 28％increase in the contribution of catenary action.Furthermore,the bending height of the reinforcing plate significantly influences the failure mode and load capacity.When the ratio of the bending height of the reinforcing plate to beam height is less than 0.2,cracks initiate at the beam ends,and the load capacity increases with the height of the reinforcing plate.When the ratio exceeds 0.2,cracks initiate at the web opening,and the load capacity decreases as the height increases.The maximum load capacity is achieved when the center of the reinforcing plate is positioned at one-quarter of the opening diameter and near the joint side.Additionally,the joint reaches its highest bearing capacity when the opening diameter is two-thirds of the beam height.关键词
钢框架/加强板/腹板开孔/连续性倒塌/悬链线效应Key words
steel frame structure/reinforcing plate/web opening/progressive collapse/catenary action分类
土木建筑引用本文复制引用
乔惠云,林誉,韦建刚,罗霞,陈灿文..腹板开孔的钢框架梁-柱节点抗连续倒塌研究[J].建筑结构学报,2025,46(4):129-139,11.基金项目
国家自然科学基金项目(52278158),福建省科技厅自然科学基金项目(2022J05188,2024J01151). （52278158）
