Refined Analysis of an L-Shaped Cap Beam Based on the Spatial Finite Element Method

Abstract

The focus of this study is the transition pier of the main approach bridge in a newly constructed project in Chengdu. It begins by introducing the configuration strategy for the prestressed tendon layout. A comparative analysis of sectional stresses is then conducted under prestress loading conditions and at the completed bridge stage, using both spatial frame models and spatial solid models. Special emphasis is placed on investigating the torsional shear stress induced by structural and loading asymmetry in the L-shaped cap beam. The results show that the spatial frame models could meet practical engineering requirements. These findings provide valuable references for the design analysis of similar engineering projects.

Keywords

L-shaped cap beam / spatial finite element / refined analysis / torsional shear stress / prestress

References

[1] Wei, B. Spatial Stress Analysis of L-shaped Bent Cap for Medium and Small Span Bridges. Master, Chang'an Univer-sity, 2011.

[2] Wang, Z.; Gao, J.; Wei, B.; Wu, R. Defects and Maintenance Measures of L-shaped Bent Cap of Urban Bridge. Municipal Engineering Technology 2021, 39,46-49, doi:10.19922/j.1009-7767.2021.02.046.

[3] Sun, H.; Gao, M.; Li, J. The Analysis of Large Cantilever L-shaped Prestressed Concrete Bent Cap Stress. Shandong Jiaotong Keji 2014, 38-39,42, doi:10.3969/j.issn.1673-8942.2014.01.013.

[4] Chen, Z. Load Characteristics and Reinforcement Methods of Double Cantilever L-shaped Prestressed Concrete Bent Caps. Urban Roads Bridges & Flood Control 2021, 55-58,77, doi:10.16799/j.cnki.csdqyfh.2021.03.017.

[5] Wu, D.; Zhang, L. Solid Calculation and Analysis of L-shaped Reinforced Concrete Bent Cap Based on FEA NX. Shan-dong Jiaotong Keji 2023, 73-77, doi:10.3969/j.issn.1673-8942.2023.04.021.

[6] Ministry of Transport of the People's Republic of China JTG D60—2015 General Specifications for Design of Highway Bridges and Culverts. China Communications Press: Beijing, 2015.

[7] Shi, Y. Analysison the Cause of Cracks of a CapBeam and Study on Reinforcement Measures. Master, Wuhan Univer-sity of Technology, 2019.

[8] Ministry of Transport of the People's Republic of China JTG 3362—2018 Specifications for Design of Highway Rein-forced Concrete and Prestressed Concrete Bridges and Culverts. China Communications Press: Beijing, 2018.

[9] Hu, Z.; Zhang, S. Experiment and Analysis on Mechanical Behavior at Root of Large Cantilever PC Bent Cap. Journal of Harbin Institute of Technology 2025, 57,55-68, doi:10.11918/202307017.

[10] Cen, G. Research on the Load Analysis of Bent Caps on Transition Piers Based on Tension-Compression Rod Model. Master, Guizhou University, 2021.