Performance Evolution and Deformation Prediction of RC Beams with Double Openings Under Fatigue Loading

LIANG Ying; XU Ruitian; CHEN Zongping; ZHANG Shiqian; MO Fan

doi:10.13204/j.gyjzG23033010

Volume 53 Issue 12

Dec. 2023

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LIANG Ying, XU Ruitian, CHEN Zongping, ZHANG Shiqian, MO Fan. Performance Evolution and Deformation Prediction of RC Beams with Double Openings Under Fatigue Loading[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(12): 113-119,163. doi: 10.13204/j.gyjzG23033010

Citation:

LIANG Ying, XU Ruitian, CHEN Zongping, ZHANG Shiqian, MO Fan. Performance Evolution and Deformation Prediction of RC Beams with Double Openings Under Fatigue Loading[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(12): 113-119,163. doi: 10.13204/j.gyjzG23033010

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Performance Evolution and Deformation Prediction of RC Beams with Double Openings Under Fatigue Loading

doi: 10.13204/j.gyjzG23033010

1. College of Civil Engineering and Architecture, Nanning University, Nanning 530200, China;
2. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
3. China Construction Eighth Engineering Division Co., Ltd., Shanghai 200112, China;
4. Guangxi Branch., China Construction Eighth Engineering Division Co., Nanning 530000, China

Received Date: 2023-03-30
Available Online: 2024-02-28

Abstract

Abstract

In the design of complex transportation hub structures, due to the laying of pipeline routes, openings are required in the web of reinforced concrete (RC) beams. In order to study the fatigue performance of RC beams with double openings, six RC beams with double openings were designed using load level ratio, load acting hole location, and fatigue times as variable parameters, and fatigue tests were conducted on them under repeated loads. The stress states and failure modes in a RC beam with double openings during fatigue loading were studied, and the effects of various parameters on the fatigue performance of the beam were discussed. A deformation compatibility model was proposed. Based on the model, the damage evolution and failure mechanism of the RC beam with double openings under fatigue loading were revealed. The research showed that under cyclic loading, the fatigue failure modes of RC beams with double openings were diagonal cracks in the upper and lower beams of the openings and cracks in the corners of the openings. The specimen with an upper load limit of 0.7P_u and a load position acting on the middle of the opening underwent fatigue failure. The RC beam with double openings had a fatigue life of at least 410 000 times under a load level of 0.5P_u. After the fatigue test, the residual ultimate bearing capacity, flexural stiffness, and ductility deteriorated with the increase of the load level. When the load was located in the middle of the opening, the residual performance of the specimen after fatigue became worse. Increasing the fatigue cycle to 410 000 times had an impact on the residual ultimate bending moment of about 7%, and the residual bending stiffness and ductility degraded by about 25%. Based on the specifications, a fatigue deformation prediction method for RC beams with double openings was proposed, with an error of less than 7%.
- reinforced concrete beam with double openings,
- fatigue performance,
- remaining performance,
- deformation compatibility model,
- deformation prediction

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References(18)

References

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