Research on the Influence of Cantilever Segment Formwork System in Block 0 on Prestressed Tensioning Effect during Cantilever Casting Construction of Continuous Girder Bridges

DOI

10.2991/978-94-6463-856-1_17How to use a DOI?

Keywords

Cantilever casting construction; Prestress effect; Formwork friction and tie bolt shear resistance; Friction test; Finite element analysis

Abstract

With China’s rapid infrastructure expansion, prestressed concrete continuous girder bridges have become prevalent in modern railway and highway projects. The cantilever casting method for Block 0 segments creates persistent interfacial constraints between concrete and the non-removable film-covered formwork system during post-tensioning. These constraints generate frictional resistance that diminishes effective prestress transfer. Field observations indicate that partially released (but not removed) side formwork tie bolts compound this effect by introducing additional frictional and shear resistance during tensioning. This dual mechanism not only reduces available prestress force but also causes unintended load transfer to the formwork system.Focusing on the Mengcheng Grand Bridge case study along the Fuhuai Railway corridor, this investigation employs experimental testing and nonlinear finite element analysis to quantify how formwork-induced constraints compromise prestress efficiency. Results demonstrate that the composite action of film-covered formwork friction and tie bolt resistance leads to insufficient effective prestress, failing to achieve design-specified stress distributions in critical structural elements.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Guangyu Zhu
AU  - Han Xian
AU  - Junsong Tao
AU  - Yuxuan Zheng
PY  - 2025
DA  - 2025/09/22
TI  - Research on the Influence of Cantilever Segment Formwork System in Block 0 on Prestressed Tensioning Effect during Cantilever Casting Construction of Continuous Girder Bridges
BT  - Proceedings of the 2025 International Conference on Resilient City and Safety Engineering (ICRCSE 2025)
PB  - Atlantis Press
SP  - 157
EP  - 165
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-856-1_17
DO  - 10.2991/978-94-6463-856-1_17
ID  - Zhu2025
ER  -