Research on the Feasibility of Transversal Stiffeners Widening Structure in 3-way Prestressed Concrete Continuous Box Girder Bridge

DOI

10.2991/iceesd-18.2018.172How to use a DOI?

Keywords

3-way Pre-stress Concrete box girder, Lateral widening, Stiffener, Foundation differential settlement.

Abstract

For the aim to solve the difficulty in 3-way prestressed concrete box girder bridge widening, a new flexible horizontal stitching structure based on the transverse stiffeners is proposed. The two flange plates between the existed box girder and new one will be separated structurally, but connected with a flexible stitching structure, which consists of s set of transverse concrete stiffeners spaced under the flange plates along the longitudinal direction. Based on a bridge widening practice, the mechanical performance of the flexible stitching structure and the existed box girder after widening are studied in detail, by considering the effect of vehicle load, foundation settlement, shrinkage and creep deformation of new concrete. Research shows that the structural stiffness of the whole structure after widening is obviously improved, and the live load effect of existed bridge can effectively be reduced, which shows that the transverse stiffener can effectively connect the new and old box girder, the widening structure can work as a joint structure. The influence of the size and spacing of stiffeners on the new and old bridges and stiffener itself is also studied. The results show that the flexible stiffener joint structure is feasible to broaden 3-way prestressed concrete box bridge, providing a new alternative scheme for similar bridge widening.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Wenqing Wu
AU  - Hao Zhao
AU  - Jianxun Zhai
PY  - 2018/05
DA  - 2018/05
TI  - Research on the Feasibility of Transversal Stiffeners Widening Structure in 3-way Prestressed Concrete Continuous Box Girder Bridge
BT  - Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018)
PB  - Atlantis Press
SP  - 952
EP  - 956
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceesd-18.2018.172
DO  - 10.2991/iceesd-18.2018.172
ID  - Wu2018/05
ER  -