Experimental study on fatigue behavior of Q460C high strength steel welded tubular T-joints under axial loading
Cheng Rui1,2 Chen Yang3 Cui Jia1,2 Huang Zongming1,2 Yao Ji1,2
1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education, Chongqing University, Chongqing 400045, China
2. School of Civil Engineering, Chongqing University, Chongqing 400045, China
3. Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China
Abstract：8 T-joint specimens made of circular hollow section (CHS) with Q460C high strength steel under axial loading on the brace were tested to determine the stress concentration factors (SCF) at hot-spot locations and investigate the fatigue behavior. The test results were compared with those predicted by the current design method and the fatigue failure modes were obtained. It was observed that the visible crack first occured near the saddle position and then propagated along the intersecting line toward crown position. By comparing results of the test and current design methods, it was found that the predicted results based on the methods in CIDECT and DNV did not agree well with the test results. The results of DNV were conservative while the method of CIDECT was unsafe in some cases, which revealed that the methods of CIDECT and DNV were both not suitable to analyze the fatigue behavior of CHS joints with Q460C high strength steel.
程睿 陈阳 崔佳 黄宗明 姚纪. 支管在轴向荷载作用下Q460C高强钢T型圆管节点疲劳性能试验研究[J]. 土木工程学报, 2017, 50(4): 57-63.
Cheng Rui Chen Yang Cui Jia Huang Zongming Yao Ji. Experimental study on fatigue behavior of Q460C high strength steel welded tubular T-joints under axial loading. 土木工程学报, 2017, 50(4): 57-63.
