钢结构节点断裂的研究现状-《建筑科学与工程学报》

文章信息/Info

Title:: Review on Research Status of Connection Fracture of Steel Structures

Author(s):: LIAO Fang-fang, WANG Wei, LI Wen-chao, ZHOU Tian-hua; School of Civil Engineering, Chang’an University

Keywords:: beam-to-column connection of steel frame; steel tube connection; fracture; research status; micromechanical model; strong earthquake

摘要:: 对钢框架梁柱节点及钢管节点断裂的研究现状进行了综述，指出现有研究多是基于传统断裂力学方法采用应力强度因子、裂纹尖端张开位移（CTOD）或J积分等预测断裂，这种方法主要适用于研究脆性断裂或局部塑性损伤程度极其有限的伪脆性断裂问题，而对强震作用下构造无明显缺陷部位发生较大尺度屈服时的延性断裂问题并不适用；介绍了近年来发展的基于微观机制的断裂预测方法，可以考虑节点区显著的应力三轴度因素，且适用于无初始裂纹或处于明显塑性阶段的节点延性断裂预测问题，可用于预测强震作用下钢结构焊接节点的超低周疲劳断裂。

Abstract:: Research status of the fractures of beam-to-column connections of steel frame and steel tube connections were reviewed. Based on traditional fracture mechanics method, it was indicated that the existing researches mostly predicted fracture by using the stress intensity factor, crack tip opening displacement (CTOD) or J-integral, etc. The method was mainly fit for the research on brittle fracture or pseudo brittle fracture with limited local plastic damage. While it was not fit for the ductile fracture prediction of the parts with large-scale yielding region and no initial flaw under strong earthquakes. Therefore, the fracture prediction method based on micromechanics developed in recent years was also introduced. It considered the stress triaxiality in the joint area and was fit for the ductile fracture prediction of the joint with no initial flaw or in obvious plastic phase. It can be used to predict extremely low cycle fatigue fracture of welded connections of steel structures under strong earthquakes.