摘要
为解决传统梁-柱连接中外环板节点凸出室内空间的问题,对多腔式钢管混凝土异形柱-H形钢梁框架节点采用U形板连接构造形式。采用ABAQUS软件建立了节点有限元模型,通过与试验对比验证了模型的准确性。对U形板连接承载力进行参数分析,得到了柱钢管变形区高度计算方法。在试验研究和有限元分析的基础上,建立了U形板连接节点承载力简化模型,考虑了U形板连接件、柱肢正面钢板及柱肢侧面钢板三部分提供的承载力。基于虚功原理提出连接节点承载力简化计算式,计算结果与试验和有限元模拟结果吻合良好。为保证U形板连接节点达到刚性节点要求,建议单腔室柱钢管宽厚比不宜大于30;U形板厚度不宜小于梁翼缘厚度的1.2倍;U形板薄弱截面宽度需大于梁翼缘宽度的1/2。
To solve the problem that the exterior diaphragms protrude from the indoor space in the traditional beam-to-column joints,a novel U-shaped diaphragm connection for the multi-cell special-shaped concrete-filled steel tube(CFST)column to H-shaped steel beam frame joint was proposed.A finite element model was established using ABAQUS software,and the accuracy of the model was verified by comparison with the experiment.The parametric analysis of the U-shaped diaphragm joints was carried out for capacity,and the calculation method for deformation zone height of the column steel tube participating in transferring the force was obtained.A simplified mechanical model for the joint strength was also developed based on the experimental study and finite element analyses,in which the contributions from the front face and side faces of steel tube and the vertical rib stiffeners were considered.Based on the theory of virtual work,a simplified calculation formula for joint strength was proposed.The calculation results are in good agreement with the results of experiments and finite element models.To ensure that the U-shaped diaphragm joints meet the requirements of rigid joints,it is suggested that the width-to-thickness ratio of the column steel tube should be less than 30,the thickness of the U-shaped diaphragm should not be less than 1.2 times of the beam flange thickness,and the weak section width of the U-shaped diaphragm should not be less than 1/2 of the beam flange width.
作者
成宇
杨远龙
李彬洋
CHENG Yu;YANG Yuanlong;LI Binyang(Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;State Key Laboratory for Track Technology of High-Speed Railway,Beijing 100081,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2021年第S02期100-108,共9页
Journal of Building Structures
基金
国家自然科学基金面上项目(51878098)
重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0580)
