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为研究传统风格建筑圆钢管柱-箱形截面双梁节点受力性能,对传统风格建筑圆钢管柱-箱形截面双梁中节点和边节点进行低周反复加载试验,分析了双梁-柱节点的破坏特征及影响因素。研究结果表明:传统风格建筑圆钢管柱-箱形截面双梁节点的破坏模式主要是下梁与大柱形成的核心区(3区)发生剪切屈服,上梁、下梁与大柱所形成的区域(2区)发生压弯破坏,部分焊缝及其热影响区的母材开裂;轴压比为0.3试件的极限承载力均高于轴压比为0.6的节点试件;相同轴压比下中节点试件的承载力高于边节点试件。给出了节点核心区2区压弯承载力验算公式并推导了节点核心区3区抗剪承载力计算公式,经与试验结果相比较,吻合较好。
In order to study the mechanical behavior of the traditional double-girder joint with circular column-box girder under traditional style construction, the low-cycle repeated loading test was conducted on the middle node and the edge node of the traditional double-girder with box-girder structure. The Destruction Characteristics of Nodes and Influencing Factors. The results show that the failure mode of the traditional double-girder joint with box-girder is mainly due to the shear yielding in the core zone (zone 3) formed by the lower beam and the large column, the formation of the upper beam, the lower beam and the large column (Zone 2), the base metal cracking occurred in some welds and heat affected zone. The ultimate bearing capacity of specimens with axial compression ratio of 0.3 was higher than that of joint specimens with axial compression ratio of 0.6. The same axis The bearing capacity of the middle node specimen under pressure ratio is higher than that of the side joint specimens. The calculation formula of the bearing capacity of the buckling in Zone 2 of the core area of the node is given and the formula for calculating the shear strength of the zone 3 in the core zone of the junction is derived. The calculated results are in good agreement with the experimental results.