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Review on Research Status of Connection Fracture of Steel Structures

LIAO Fang-fang;WANG Wei;LI Wen-chao;ZHOU Tian-hua;School of Civil Engineering,Chang'an University;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University;  
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.
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