加强型完全叠接管节点滞回性能试验测试

EXPERIMENTAL STUDY ON HYSTERIC PERFORMANCE OF STRENGTHENED COMPLETELY OVERLAPPED TUBULAR JOINTS

为了研究加强型完全叠接圆钢管节点的滞回性能,分别对1个未加强型完全叠接圆钢管节点和2个采用不同加强方式加强的完全叠接管节点试件进行了试验测试。通过控制叠接支管端部发生轴向位移,对试件施加了低周往复荷载,研究了试件的破坏模式,分析了试件的延性和能量耗散。研究发现:局部加厚TL节点处相接支管的壁厚能够有效的防止相接支管的局部屈曲;同时局部加厚相接支管的厚度和在相接支管内部设置套管能够显著的改善节点的滞回性能,提高节点的承载能力和耗能能力,但可能会使主管发生脆性断裂破坏。

In order to study the hysteretic behaviour of strengthened completely overlapped tubular joints,experimental tests are carried out to an unreinforced completely overlapped tubular joint and two strengthened specimens with different reinforced methods.Axial low cycle loadings are applied to the free end of the overlapped brace using a displacement control method.The failure mode is studied,and the ductility and energy dissipation are analyzed.It can be concluded that： Partly increasing the thickness of the through brace can efficiently prevent local buckling occurrence on the through brace;The hysteretic performance can be greatly improved by increasing the thickness of the through brace and placing a internal sleeve in the through brace,also the bearing capacity and the energy dissipation can be improved,but brittle failure may occur on the chord.