Overall Design of a Double-Deck Truss Single-Pylon Cable-Stayed Bridge

Abstract

The main bridge in Lu’an is a double-deck truss single-pylon cable-stayed bridge with double-cable planes, featuring a span arrangement of 98 m + 105 m + 255 m + 300 m = 758 m. The structural system is a semifloating system with longitudinal restraints. The main girder is a composite steel truss structure comprising two transverse main trusses spaced at 26.1 m. The main trusses adopt a triangular (Warren) configuration, with a truss height of 10 m and a panel length of 15 m. The upper deck consists of an orthotropic steel deck, while the lower deck comprises an orthotropic composite deck. The pylon is designed as a water-drop-shaped tower with a total height of 164.670 m. A total of 32 pairs of stay cables is arranged in a spatial double-cable-plane fan configuration using steel strands with a standard tensile strength of 1,860 MPa. The basic cable spacing is 15.0 m along the deck and 2.5 m along the pylon. The stay cables are anchored at the girder ends using steel anchor boxes, while a combined anchorage system consisting of steel anchor beams and circumferential prestressing (directly anchored into the pylon walls) is employed at the pylon ends.

Keywords

single-pylon cable-stayed bridge / structural system / double-deck truss / orthotropic composite deck / bridge design

References

[1] Fan, L. Bridge Engineering; China Communications Press: Beijing, China, 2001. (in Chinese)

[2] Xiao, R.; et al. Bridge Structure System; China Communications Press: Beijing, China, 2013. (in Chinese)

[3] Shao, C. Cable Supported Composite Bridges; China Communications Press Co., Ltd.: Beijing, China, 2017. (in Chinese)

[4] Wu, D. Mechanical Behavior Analysis of the Pile Cap for the Main Pylon of an A-Shaped Cable-Stayed Bridge. Prestress Technology 2026, 4, 80-93, doi: 10.59238/j.pt.20251117001.

[5] Shao, C. Beam-type Composite Structure Bridges; China Architecture & Building Press: Beijing, China, 2015. (in Chinese)

[6] Hou, M.; Wang, M. Key Design Techniques for Steel Truss Girder of Beipanjiang Bridge on Bijie-Duge Expressway. World Bridges 2018, 46, 1-6, doi: 10.3969/j.issn.1671-7767.2018.03.001. (in Chinese)

[7] Lai, Y.; Zhang, Z.; Deng, Y. Landscape Design for Jialingjiang River Bridge in Hongyan Village, Chongqing. World Bridges 2018, 46, 21-26, doi: 10.3969/j.issn.1671-7767.2018.05.005. (in Chinese)

[8] Li, Y.; Fan, B.; Feng, Y.; et al. Design of Very Wide Steel Truss Girder of Yangbaoshan Bridge on Guiyang-Huangping Expressway. World Bridges 2021, 49, 1-7, doi: 10.3969/j.issn.1671-7767.2021.06.001. (in Chinese)

[9] Zhang, L.; Ma, G.; Ji, W.; et al. Design of Main Bridge of Dongying Huanghe River Rail-cum-Road Bridge of Tianjin-Weifang High-Speed Railway. Bridge Construction 2025, 55, 117-124, doi: 10.20051/j.issn.1003-4722.2025.01.016.(in Chinese)

[10] Ma, B.; Yan, A.; Deng, Q.; et al. Design and Conception of Shanghai Minpu Bridge. Shanghai Construction Science & Technology 2010, 05, 1-4+19.

[11] Li, W.; Yang, G.; Xu, W. Design of Steel Truss Girder Cable-Stayed Bridge of 567-m Main Span of Huanggang Changjiang River Rail-cum-Road Bridge. Bridge Construction 2013, 43, 10-15. (in Chinese)

[12] Lu, D. Analysis on Structural Parameters of U-shaped Rib Orthotropic Composite Bridge Deck. Urban Roads Bridges & Flood Control 2023, 5, 190-194+24, doi: 10.16799/j.cnki.csdqyfh.2023.05.049.(in Chinese)

[13] Li, X.; Cai, J.; Qiang, S. Studies on Models of Cable-Girder Anchorage for Long-Span Cable-Stayed Bridges with Steel Box Girder. China Civil Engineering Journal 2004, 03, 73-79, doi: 10.15951/j.tmgcxb.2004.03.011.(in Chinese)

[14] Yao, C. Study on Structural Behavior and Fatigue Performance of Cable-Girder Anchorage for Railway Cable-Stayed Bridge with Steel Box Girder. Ph.D. Thesis, Southwest Jiaotong University, Chengdu, China, 2016. (in Chinese)

[15] Ye, J.; He, W.; Yan, W.; et al. Mechanical Analysis and Structural Optimization of Stay Cable Anchorage Zones in Main Girder of Aojiang River Bridge. Bridge Construction 2017, 47, 54-59, doi: 10.3969/j.issn.1003-4722.2017.02.010. (in Chinese)

[16] Li, G.; He, D.; Liu, Y.; et al. Load Bearing Capacity Analysis and Load Transfer Mechanism Study of Cable-Girder Anchorage Zone of Xihoumen Rail-cum-Road Bridge. Bridge Construction 2023, 53, 40-47, doi: 10.20051/j.issn.1003-4722.2023.03.006. (in Chinese)

[17] Shi, Z.; Zhou, Y.; Jiang, F.; et al. Mechanical Characteristics and Structure Optimization of Cantilevered Steel Anchor Box of Rail-cum-Road Steel-Concrete Slab-Truss Cable-Stayed Bridge. China Railway Science 2024, 45, 50-60,doi: 10.3969/j.issn.1001-4632.2024.03.05. (in Chinese)

[18] Xu, W.; Yuan, R.; Wang, Q.; et al. Design of Structural System and Steel Girder for Main Navigational Channel Bridge of Changtai Changjiang River Bridge. Bridge Construction 2021, 51, 1-8, doi: 10.3969/j.issn.1003-4722.2021.03.001. (in Chinese)

[19] Luo, C.; Weng, F. Key Pylon Construction Techniques for Main Bridge of Quanzhou Bay Sea-Crossing Bridge. World Bridges 2022, 50, 40-47, doi: 10.3969/j.issn.1671-7767.2022.05.007. (in Chinese)

[20] Zhu, W.; Wang, L.; Cao, X.; et al. Overall Design of Yinzhou Lake Bridge of Zhongshan-Yangchun Expressway. World Bridges 2023, 51, 32-37, doi: 10.20052/j.issn.1671-7767.2023.01.005. (in Chinese)

[21] Zhu, X.; Jin, X. Key Erection Techniques for Steel Anchor Boxes in South Navigational Channel Bridge of Bianyuzhou Changjiang River Bridge. World Bridges 2023, 51, 28-33, doi: 10.20052/j.issn.1671-7767.2023.06.005. (in Chinese)