Effective anchorage stress of prestressed tendons in PC girders under varying tensioning sequences

• Autorzy: Xiao Guangqing , Chen Xilong , Xu Lihai , Wu Fucheng , Zeng Liang , He Shaohua

Identyfikatory

DOI

10.24425/ace.2025.155095

• Języki publikacji: EN

Abstrakty

EN

In current design codes, the standardized anchorage stress of prestressed tendons in concrete girders is uniform, which presents a notable challenge in accurately assessing the effective anchorage stress of girders with varying span lengths. This study investigates the impact of prestressed tendons’ span length and tensioning sequences on effective anchorage stress in small-box girders (20 m, 25 m, 30 m) and 40 m T-shaped girders. Comprehensive theoretical approaches for computing the effective anchorage stress of the tendons, accounting for stress losses due to conduit friction, anchor deformation, rebar relaxation, concrete, and joint compression, are presented. The calculated results for prestressed concrete (PC) girders with typical span lengths and cross-sections demonstrate that girder length and tensioning sequence influence the effective anchorage stress of prestressed tendons. The currently recommended standardized effectiveanchorage stress of 1280 MPa in existing codes, derived solely from a designated length and anchorage retraction, proves inadequate for PC girders of varying lengths. Based on theoretical and numerical findings, refined effective anchorage stress of 1237 MPa, 1244 MPa, and 1251 MPa are proposed for small-box girders with span lengths of 20 m, 25 m, and 30 m, respectively, while the recommended effective anchorage stress for a T-shaped PC girder with a length of 40 m is 1251 MPa. Adoption of the evaluation method effective anchorage stress yields an improved prestressed quality passing rate ranging from 4.0% to 10.9%, thereby effectively reducing the necessity for unnecessary supplementary tensioning or excessive tensioning during on-site construction to meet project requirements.

• Wydawca: Komitet Inżynierii Lądowej i Wodnej PAN ; Politechnika Warszawska, Wydział Inżynierii Lądowej
• Czasopismo: Archives of Civil Engineering
• Rocznik: 2025
• Tom: Vol. 71, nr 3
• Strony: 217--230
• Opis fizyczny: Bibliogr. 25 poz., il., tab.

Twórcy

autor

Xiao Guangqing

• Guangzhou Guangjian Construction Engineering Testing Center Co., Ltd, Guangzhou, China

• https://orcid.org/0009-0003-3978-6100

autor

Chen Xilong

• Guangzhou Guangjian Construction Engineering Testing Center Co., Ltd, Guangzhou, China

• https://orcid.org/0009-0008-9907-4590

autor

Xu Lihai

• Guangzhou Guangjian Construction Engineering Testing Center Co., Ltd, Guangzhou, China

• https://orcid.org/0009-0003-3805-1196

autor

Wu Fucheng

• Guangzhou Guangjian Construction Engineering Testing Center Co., Ltd, Guangzhou, China

• https://orcid.org/0009-0008-0570-1857

autor

Zeng Liang

• Guangzhou Guangjian Construction Engineering Testing Center Co., Ltd, Guangzhou, China

• https://orcid.org/0009-0007-4329-6031

autor

He Shaohua

• Guangdong University of Technology, Guangzhou, China

• https://orcid.org/0000-0002-0727-1976

Bibliografia

• [1] China Association for Engineering Construction Standardization, Technical Standards of Effective Prestress under Anchorage Tests for Highway Bridge. China Association for Engineering Construction Standardization, 2020.
• [2] D. Mao, et al., “Research on influence of prestress loss of long span PC continuous girder bridge”, Highway Engineering, vol. 47, no. 2, pp. 26-31, 2022, doi:10.19782/j.cnki.1674-0610.2022.02.005.
• [3] Y. Liu, et al., “Parametric study on web cracks of PC box-girder bridges”, Journal of China & Foreign Highway, vol. 41, no. 5, pp. 116-119, 2021, doi:10.14048/j.issn.1671-2579.2021.05.025.
• [4] S. He, et al., “Experimental study on bond performance of UHPC-to-NC interfaces: constitutive model and size effect”, Engineering Structures, vol. 317, art. no. 118681, 2024, doi:10.1016/j.engstruct.2024.118681.
• [5] S. He, et al., “Performance assessment of channel beam bridges with hollow track bed decks”, Structures, vol. 61, no. 5, 2024, doi:10.1016/j.istruc.2024.105988.
• [6] W. Cao, “Research on mid-span deflection and crack control of long-span continuous rigid frame bridge”, M.A. thesis, Shijiazhuang Railway University, China, 2019.
• [7] W. Zheng, et al., “Research on treatment countermeasures of mid-span deflection disease of long-span rigid frame bridge”, Journal of Highway and Transportation Research and Development, vol. 15, no. 5, pp. 194-196, 2019.
• [8] J. Wang, et al., “Seismic performance of horizontal swivel system of asymmetric continuous girder bridge”, Archives of Civil Engineering, vol. 69, no. 1, pp. 287-306, 2023, doi:10.24425/ace.2023.144174.
• [9] S. He, et al., “Cracking performance in the hogging moment region of HSS-UHPC continuous composite girder bridges”, Structures, vol. 61, no. 6, 2024, doi:10.1016/j.istruc.2024.106081.
• [10] C. Ren, et al., “Primary investigation for unevenness of effective prestress”, Technology of Highway and Transport, vol. 31, no. 6, pp. 63-67, 2015, doi:10.13607/j.cnki.gljt.2015.06.015.
• [11] J. Chen, “Research on detection method of prestressed elastic wave under precast beam anchor”, M.A. thesis, Chongqing Jiaotong University, China, 2018.
• [12] M. Dong, “Research on the measurement and control index of effective prestress under anchor based on reliability theory”, M.A. thesis, Chongqing Jiaotong University, China, 2017.
• [13] J. Lin, et al., “Study on the reasonable range of effective prestress loss rate under post-tensioned precast T-beam anchor”, Journal of Highway and Transportation Research and Development, vol. 9, no. 7, pp. 196-198, 2013.
• [14] C. Chen, et al., “Study on the safety surplus of the valid prestressed force under anchor”, Highway Engineering, vol. 38, no. 3, pp. 53-56, 2013
• [15] Z. Yao, et al., “Construction quality control of prestressed post tensioning method based on effective prestressed detection of anchor”, Journal of China & Foreign Highway, vol. 40, no. 4, pp. 179-183, 2020, doi:10.14048/j.issn.1671-2579.2020.04.039.
• [16] Q. Jiang, et al., “Study on time-varing attenuation effect of anchor prestress within 48 hours after tensioning of steel strands”, Journal of China & Foreign Highway, vol. 40, no. 4, pp. 105-109, 2020, doi:10.14048/j.issn.1671-2579.2020.04.022.
• [17] X. Chen, et al., “Evaluation on effective prestress in anchor based on different control driteria”, Journal of China & Foreign Highway, vol. 41, no. 3, pp. 92-95, 2021, doi:10.14048/j.issn.1671-2579.2021.03.019.
• [18] J. Ye, Structural design principle. People’s Communications Press, 1997.
• [19] J. Wang, et al., “Stability monitoring method of UHPC spherical hinge horizontal rotation system”, Archives of Civil Engineering, vol. 68, no. 3, pp. 601-616, 2022, doi:10.24425/ace.2022.141905.
• [20] Ministry of Transport of the People’s Republic of China, Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts. Beijing: People’s Traffic Press, 2018.
• [21] Y. Zhang, et al., “Study of the loss of prestress of tendon in post-tensioned prestressed concrete beams”, Journal of China & Foreign Highway, vol. 15, no. 2, pp. 76-78, 2002, doi:10.3321/j.issn:1001-7372.2002.02.019.
• [22] Ministry of Transport of the People’s Republic of China, General Code for Highway Bridges and Culverts. China Communications Press, 2020.
• [23] Z. He, et al., Chaoshan Ring Expressway (including Chaoshan Connection Line). CCCC Highway Consultants Co., Ltd, 2017.
• [24] X. Zhang, et al., Construction Drawing Design of Humen Second Bridge Project. CCCC Highway Consultants Co., Ltd, 2013.
• [25] T. Li, et al., “Research on effective stress control technology of precast small box girder”, Sichuan Cement, no. 11, pp. 49-51, 2023.