蜂窝钢梁-焊接环式箍筋砼柱节点抗震受剪承载力

Research on Bearing Performance of Honeycombed Steel Beam and Welded Compound-ring-hoop Concrete Column Composite Joints

为研究焊接蜂窝钢梁-复合焊接环式箍筋砼柱连接节点的破坏特征和受力性能,进行了4个蜂窝梁贯通型接点、2个外伸式端板连接节点、2个平齐式端板连接节点的低周反复荷载试验。试验表明前三组试件为节点核心区剪切破坏,第四组试件为钢梁翼缘屈服破坏;外伸式端板的约束作用以及高强螺栓预压力的存在,使得节点域混凝土开裂较少,大大改善了节点域的抗剪能力,同时也能增大节点刚度。对节点的抗震受剪承载力进行了分析,并根据试验结果得到了节点核心区抗震受剪承载力计算公式,可供工程实际参考。

A series of specimens, including four pass-through connection joints, two extended end-plate connection joints and two end-plate connection joints under low cyclic reversed load were tested in order to study the failure characteristic and bearing performance of honeycombed steel beam and welded compound-ring-hoop concrete column composite joints. Test resuhs showed that the first three groups of joints were core shear failure and the fourth group of joints was beam flange yield damage. With restriction effect of extended end-plate and pre-pressure of high-strength bolt, it makes the concrete of joint region with fewer cracks, shear capability of joint region greatly improved, and joint rigidity increased. Then, the joint＇ s seismic shear capacity was analyzed. Finally, the seismic shear capacity formula of the care zone is present according to the test results, which may provide reference for engineering practice.