Fracture Behavior Analyses Compared Dog-Bone Connection with Traditional Connection

Abstract:

Through the ABAQUS three dimensional modeling, established the dog-bone connection and traditional connection’s 3D finite element model, obtained the beam to column’s hysteretic curve, crack tip’s stress intensity factor as well as energy release rate at the weld of beam-column connection, the middle of reduced beam section and the same place in traditional connection. The theoretical analysis indicated, reduced beam connection’s hysteretic curve is more plumpness in shapes, have no significant pinch phenomenon, spindle shape, so the energy dissipation is better. From the view of fracture toughness, the weld joint’s fracture toughness is basically the same between dog-bone connection and traditional connection, the curves of weld crack tip’s biggest stress intensity factor as well as energy release rate about the two types connection are separately overlap, but at the middle of reduced beam section compared with the same place at the traditional connection, crack tip’s biggest stress intensity factor as well as energy release rate are significantly increased, when the initial crack length 3mm is assumed at the middle reduced beam section and the same place at the traditional connection, the reduced beam section connection’s nominal stress when reaching the material toughness KIC, it is 17% lower than traditional connection, in stress developing process, the middle of reduced beam section’s stress is biggest and it can reach material toughness. So the reduced beam connection can play a role as fuse, realize strong joints weak pole design concept.

• Periodical: Advanced Materials Research (Volumes 368-373)
• Pages: 2084-2088
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.368-373.2084
• Online since: October 2011
• Authors: Yu Ping Sun, Zhen Shan Hou
• Keywords: Energy Release Rate, Fracture Toughness, Hysteretic Curve, Reduced Beam Connection, Stress Intensity Factor (SIF)

References

[1] Yiyi Chen. (1999). Journal of Tongji University, 27(5), pp.587-591.(in Chinese)

[2] Yuanqing Wang, Hui Zhou, Yongjiu Shi and Hong Chen. (2010). International Journal of Steel Structures, 10(3), pp.253-265.

[3] Xinwu wang. Research to beam-column connection of steel frame. Wuhan University of Technology.2005 (in Chinese)

[4] Yuping Sun, Yi Li，in: Structural Integrity and Materials Ageing in Extreme Conditions edited by Shan-tung Tu, Zhengdong Wang, George C. Sih, (2010), in press

[5] Irwin G R. One set of fast crack propagation in high strength steel and aluminum alloys. Sagamore Research Conference Proceedings, 1956, 2:289-305.

DOI: 10.21236/ad0099305