Study on the Old Girders in the Widening Hollow Slab Girder Bridge

Ying Wang,Li Fang Zhang,Hai Yan Ma,M Mostafa

doi:10.1051/e3sconf/20183803028

Ying Wang, Li Fang Zhang + Show 2 more

Open Access

https://doi.org/10.1051/e3sconf/20183803028

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Abstract

Taking the bridge widening project of Shanghai-Hangzhou-Ningbo expressway widening construction project (China) as the background in this paper, the variation law of the internal force of the old bridge in the widening hollow slab girder bridge under vehicle load is studied, which is under the condition of different span lengths and different widening widths. Three different span lengths of the pre-tensioned prestressed hollow slab girder bridges are selected, the spatial finite element models of both the old bridge and the whole structure of widening bridge are established and calculated respectively by Midas/Civil software. The influences of widening and load increasing on the old bridges under the vehicle load are compared and analyzed. In addition, the authors also analyze the influences of different widening widths on the force state of old bridges under the condition of widening the same number of lane. Moreover , the effects on the old bridges that are caused by the uneven foundation settlement of widening bridge structure are also studied in this paper. This paper can provide some references for widening design of hollow slab bridges.

Highlights

The vast majority of expressways built last century in China are two-way four lanes expressways due to the restrictions of many factors
There are currently three ways to widen the hollow slab bridges in China: neither the superstructure nor the substructure of the old and new bridges being connected; both the superstructure and the substructure of the old and new bridges being connected; the superstructure of the old and new bridges being connected while the substructure being separated 1
Shanghai-Hangzhou-Ningbo expressway widening construction project (China) is taken as the background in this paper, three different span lengths of the pretensioned prestressed hollow slab girder bridges are selected to be calculated and analyzed, in order to find out the variation law of the internal force of the old bridge in the widening hollow slab girder bridge under vehicle load

Summary

Introduction

The vast majority of expressways built last century in China are two-way four lanes expressways due to the restrictions of many factors. The majority of expressway widening and reconstruction projects involve the widening and reconstruction of bridges, and hollow slab bridge is the common bridge type in China, so the key technology to widen and rebuild hollow slab bridges has been a research focus. There are currently three ways to widen the hollow slab bridges in China: neither the superstructure nor the substructure of the old and new bridges being connected; both the superstructure and the substructure of the old and new bridges being connected; the superstructure of the old and new bridges being connected while the substructure being separated 1. Considering the adverse effect of differential foundation settlement between the old and new structures on widening bridges, the third method of widening the hollow slab bridges is generally adopted in China. It is systematically studied that the influence of widening on the main girders in old bridges which are the same type of bridge on the same line under the condition of different spans, different widening widths and load increasing

General Situation of the Project

Design Codes

Finite Element Modeling

Influence of Foundation Settlement of Widening Structure on Old Bridge

Conclusion