Interaction of bending, shear and torsion in U-shaped thin-walled RC girders. (15th January 2019)

• Record Type: Journal Article
• Authors: Xu, Jianchao; Diao, Bo; Guo, Quanquan; Ye, Yinghua; Mo, Y.L.; Chen, Hongbing
• Is Part Of: Engineering structures. Volume 179(2019)
• Page Start: 655
• Page End: 669
• Publication Date: 2019-01-15
• Subjects: U-shaped thin-walled RC girders -- Bending-shear-torsion interaction -- Torque-bending moment ratios -- Failure mode -- Load capacity -- Numerical modeling; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.11.011
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Failure modes and ultimate loads of U-shaped thin-walled RC girders under combined actions are calculated. The behaviors of these girders under combined actions were numerically simulated. Effects of boundary condition, span length and reinforcement ratio are investigated. Interactions of bending, shear and torsion in these girders were derived. Abstract: U-shaped thin-walled concrete girders have been widely applied in the urban construction of rail viaducts in China as well as worldwide, and these girders are usually subjected to the combined actions of bending, shear and torsion. However, the interactions of bending, shear and torsion in these girders are unclear. The behaviors of these girders under the combined actions are analytically studied, and a method predicting the failure modes and calculating the ultimate loads is developed here. Also, numerical models are built and calibrated with the test results. Then case studies are conducted based on the above calculating method and numerical models. It is found that when a specific set of U-shaped thin-walled RC girders are under the combined actions, with the increase of torque-bending moment ratio, the failure type tends to change from flexural failure to shear failure. Besides, shear failures are more likely to occur in the following cases: simply supported girders, girders with large or small span lengths, and girders with large reinforcement ratios of longitudinal bars to stirrups. Finally, the interaction relationships of bending, shear and torsion in these girders are derived. In a flexural failure, the relationship between bending moment and torque is basically linear; the relationship between torque and shear force is basically quadratic; and the relationship between bending moment and shear force is quadratic. In a shear failure, the relationship between torque and shear force is basically linear.