Study on ultimate load bearing capacity of tubular XK-joints based on micromechanical fracture models
Yin Yue1,2 Che Xinyu1,3 Han Qinghua1,2 Lei Peng1,4
1. School of Civil Engineering, Tianjin University, Tianjin 300072, China|
2. Key Laboratory of Coast Civil Structure Safety of the Ministry of Education, Tianjin University, Tianjin 300072, China
3. China Southwest Architectural Design and Research Institute Co. Ltd., Chengdu 610041, China
4. Central Southern China Electric Power Design Institute Co. Ltd. of China Power Engineering Consulting Group, Wuhan 430071, China
Abstract：Micromechanical fracture models, void growth model (VGM) and stress modified critical strain model (SMCS), were adopted in fracture prediction of tubular XK-joints. The influence of welding detail in FE model on fracture prediction was analyzed. Based on comparisons with experimental results, the importance of reasonable modeling of the welding detail was illustrated and the applicability of VGM on fracture prediction of tubular joints was verified. Failure modes and ultimate load bearing capacity of tubular XK-joints under axial loads of brace members were then analyzed. The results showed that the joint may fail by fracture at the weld toe between the brace member in tension and the chord. This failure mode is strength failure and the fracture load should be taken as the ultimate load bearing capacity of the joint. The joint may also fail at the intersection between the brace member in compression and the chord due to excessive plastic deformation, and hence, the peak load on the load-chord deformation curve shall be taken as the ultimate load bearing capacity of the joint. The failure mode of the joint depends on the geometric configuration of the joint and loading conditions of brace members.
尹越 车鑫宇 韩庆华 雷鹏. 基于微观断裂机制的XK型相贯节点极限承载力分析[J]. 土木工程学报, 2017, 50(7): 20-26.
Yin Yue Che Xinyu Han Qinghua Lei Peng. Study on ultimate load bearing capacity of tubular XK-joints based on micromechanical fracture models. 土木工程学报, 2017, 50(7): 20-26.
