Transverse Distribution Calculation and Analysis of Strengthened Yingjing Bridge

Liao Xiaofang,Li Dongdong

doi:10.5539/mas.v8n3p107

Abstract

Box-girder has been adopted to strengthen bridge as large border girder, in which the original girders can be unloaded with box-girder bearing most loads. However, the load transverse distribution calculation method for it is still imperfect thus a modified calculation method is specially proposed to calculate the load transverse distribution in this case basing on existed methods. An engineering example is introduced to describe the calculation process and corresponding FEM model is established to validate the feasibility and applicability of this calculation method. Besides, comparisons between the load transverse distribution before and after strengthened are conducted which further proves that adding box-girder to the original bridge is an effective strengthening way.

Highlights

Nowadays, strengthening the original bridge by adding large border girder to original girders has been a new tendency in bridge strengthening engineering (Wu & Zheng, 1997)
To more accurately calculate the load transverse distribution when strengthening with box-girder, a modified method is proposed in this paper on the basis of existed methods, in which the box-girder is divided into two T-girders with bending stiffness and torsional stiffness distributed to them, whose deformation can be taken into consideration
Comparisons between the load transverse distribution of Yingjing Bridge before and after strengthened are conducted which further proves that adding box-girder to the original bridge is an effective strengthening way to avoid cracks and improve the bearing capacity

Summary

Introduction

Nowadays, strengthening the original bridge by adding large border girder to original girders has been a new tendency in bridge strengthening engineering (Wu & Zheng, 1997). Box-girder is naturally preferred as large border girder for strengthening to bear most loads due to its superior bending and torsional stiffness, which has been applied in practical engineering (Nie et al, 2010). Rigid connected girder method (Fan, 2001; He & Xie, 1996; Li & Shi, 1977) is usually used to calculate the load transverse distribution of assembly T-girder bridge but it can’t be used in this condition since the differences of girder size and stiffness can’t be taken into consideration. To more accurately calculate the load transverse distribution when strengthening with box-girder, a modified method is proposed in this paper on the basis of existed methods, in which the box-girder is divided into two T-girders with bending stiffness and torsional stiffness distributed to them, whose deformation can be taken into consideration. Comparisons between the load transverse distribution of Yingjing Bridge before and after strengthened are conducted which further proves that adding box-girder to the original bridge is an effective strengthening way to avoid cracks and improve the bearing capacity

Project Summary

Calculation Process

FEM Analysis

Comparison to the Transverse Distribution before Strengthened

Findings

Conclusions and Suggestion