钢次梁-混凝土主梁贯入式节点试验

Experimental study on the joint of concrete girder and inserted steel secondary beam

摘要:

提出一种在钢次梁梁端焊接锚固端板，并完全贯入混凝土主梁的新型钢次梁-混凝土主梁贯入式节点.为研究在弯矩作用下该节点的受力性能和破坏过程，对单边钢次梁-混凝土主梁贯入式T型节点进行1：2缩尺的静力加载试验.试验结果表明：按混凝土梁受扭承载力略大于钢次梁抗弯承载力原则设计的节点，其破坏表现为钢次梁上翼缘受拉屈服，可完全发挥钢次梁的抗弯承载力，试验承载力略大于承载力理论计算值；试验过程中，节点区域锚固良好；节点有较好变形能力，转角延性系数可达5.11.

Abstract:

This paper investigates a new type of secondary beam through type concrete girder-steel secondary beam connection. In the core zone, the steel beam fully crosses through the concrete girder with an end plate welded at steel beam end. Static test was conducted on the 1/2 scale specimen to study the mechanical behavior and failure process of this type of joint during bending moments. Tests results indicate that the bending failure of steel secondary beam occurs, and the strength of steel secondary beam can be fully used. Test capacity value is slightly higher than theoretical calculation value. Steel beam was anchored well and no slippage failure occurred during load process. The specimen showed excellent deformation capability and ductility coefficient can reach 5.11.