FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP

WANG Wujun; JIE Zhiyu; CHEN Chao

doi:10.13204/j.gyjzG20011305

Volume 51 Issue 5

Sep. 2021

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WANG Wujun, JIE Zhiyu, CHEN Chao. FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 181-187. doi: 10.13204/j.gyjzG20011305

Citation:

WANG Wujun, JIE Zhiyu, CHEN Chao. FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 181-187. doi: 10.13204/j.gyjzG20011305

WANG Wujun, JIE Zhiyu, CHEN Chao. FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 181-187. doi: 10.13204/j.gyjzG20011305

Citation:

WANG Wujun, JIE Zhiyu, CHEN Chao. FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 181-187. doi: 10.13204/j.gyjzG20011305

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FATIGUE PERFORMANCE OF CRACKED WELDED CRUCIFORM JOINTS STRENGTHENED BY CFRP

doi: 10.13204/j.gyjzG20011305

School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China

Received Date: 2020-10-20
Available Online: 2021-09-16
Publish Date: 2021-09-16

Abstract

Abstract

Fatigue failure is a common form of failure of welded steel bridges under cyclic loading. In order to extend its life, the cracked structure needs to be strengthened and repaired. Due to its excellent performance, CFRP has been widely used in the reinforcement of concrete structures, but rarely used in welding steel structures. In the paper, the effects of different initial crack depths, CFRP fabric thickness and elastic modulus on fatigue performance under cyclic loading were studied through experiments and finite element methods. The finite element software ABAQUS was used to analyze the change laws of stress intensity factors of reinforced or unreinforced welded cruciform joints, and compared with the analytical results. It was found that the error of the stress intensity factor obtained by the numerical simulation solution and the theoretical solution of the unreinforced specimen was very small, which verified the accuracy of the numerical simulation. The adhesive layer was simulated by using CPE8 and cohesive element, and the maximum deviation was found to be -3.4%. CFRP could effectively reduce the strength factor at the cracking tip and extend its fatigue life, with a maximum increase of 67%. When the elastic modulus and thickness of the CFRP cloth were larger, the decrease of the stress intensity factor at the cracking tip was more obvious. The remaining fatigue life of the cruciform joints was estimated based on the Paris formula, and the predicted life was compared with the test results, and it was found that the agreement was good.
- CFRP,
- welded cruciform joint,
- fatigue life,
- numerical simulation,
- stress intensity factor

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References(21)

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