Abstract

Due to various reasons, some cable-stayed bridges require the replacement of part or all stay cables after operating for a period of time. In this study, based on some engineering practices of stay cable replacement, the condition of bridge structure before replacement is analyzed with Finite Element Analysis method for plane member system. The theoretical calculations, cable force measurement, replacement methods and process monitoring for cable replacement are introduced to find out the key technical problems. From the specified bridge monitoring practices, we suggest monitoring cable tension and the main beam alignment during the process of cable replacement, to make sure the cable-stayed bridge reaches its design conditions.

Highlights

  • The cable-stayed bridge is a common type of bridges in modern world

  • After a period of operation, due to stay cable relaxation, concrete shrinkage and creep, the dead load internal forces of the structure will certainly deviate from the ideal state of the design and the bridge alignment will deviate from design

  • How to perform better simulations on the cable tension and main beam alignment deviation before replacement and which techniques and methods of monitoring to be taken during construction, are the key technical problems for cable-replacement project of the Cable-stayed Bridge

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Summary

INTRODUCTION

The cable-stayed bridge is a common type of bridges in modern world. Because most parts of the stay cables in a cable-stayed bridge are exposed outside of girders and towers, the thin cables under high stress are very sensitive to rust. After a period of operation, due to stay cable relaxation, concrete shrinkage and creep, the dead load internal forces of the structure will certainly deviate from the ideal state of the design and the bridge alignment will deviate from design. Some famous bridge, including Bridge Maracaibo in Venezuela, Bridge Kohlbrand Estury in Germen, Bridge St. Nazaire in France, Bridge Paso-Kennewick in United States, had replace their stay cables for improper protection (Wentao, 2006). Nazaire in France, Bridge Paso-Kennewick in United States, had replace their stay cables for improper protection (Wentao, 2006) Those bridges in China, including Bridge Haiyin in Guangzou, the Highway Bridge over Yellow River in Jinan, Bridge Minwei over River Min and Bridge Tongzilin over River Yayanjiang in Sichuan,etc., have changed all cables because of rust problems.

ANALYSIS OF INTERNAL FORCES AND DEFORMATION
Down measured
MONITOR OF CABLE TENSION IN CABLE REPLACEMENT
Findings
CONCLUSION

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