Research on load bearing performance recovery method of a RC simply-supported beam bridge

Dejun Mao,Xun Jiang,Zongxing Zhang,Liu Jinlin,Lan Shuwei,A Caggiano

doi:10.1051/e3sconf/202129302049

Dejun Mao, Xun Jiang + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/202129302049

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Abstract

The load-bearing performance of a RC simply supported beam bridge was comprehensively detected and evaluated. The appearance detection results show that there is a large area of damaged and exposed reinforcement in the main girder and diaphragm plate of the bridge. The detecting results of material condition and state parameters show that the durability of the bridge is insufficient, the risk of steel corrosion is large, and the strength condition of concrete material is poor. The load test results show that the bearing capacity of the bridge does not meet the requirements. In view of the current situation of the bridge, a comprehensive reinforcement treatment scheme was proposed, in which modified epoxy mortar is used to repair the main beam and diaphragm of the whole bridge, steel plate is pasted to reinforce the main beam of the whole bridge, and anticorrosive coating is applied on the main beam and diaphragm.

Highlights

In actual engineering, due to various reasons, such as longterm use of functional degradation, earthquakes and other natural disasters, changes in structural use functions, improper design, poor construction quality, the bridge’s bearing capacity is insufficient, safety and reliability are reduced, and reinforcements are needed
Reinforced concrete (RC) supported beam bridges have the characteristics of simple force, convenient design and calculation, and low construction cost, and have been widely used worldwide
With a width of 10.2 m, and the total width of the bridge is 20.4m. Both the left and right parallels are arranged with 6 pieces of reinforced concrete supported T beams, 4 transverse partitions are arranged at equal intervals along the longitudinal direction of the T beams, the support is plate rubber bearing, the abutment is gravity abutment, and the deck pavement for asphalt concrete

Summary

Introduction

Due to various reasons, such as longterm use of functional degradation, earthquakes and other natural disasters, changes in structural use functions, improper design, poor construction quality, the bridge’s bearing capacity is insufficient, safety and reliability are reduced, and reinforcements are needed. Reinforced concrete (RC) supported beam bridges have the characteristics of simple force, convenient design and calculation, and low construction cost, and have been widely used worldwide. With a width of 10.2 m, and the total width of the bridge is 20.4m Both the left and right parallels are arranged with 6 pieces of reinforced concrete supported T beams, 4 transverse partitions are arranged at equal intervals along the longitudinal direction of the T beams, the support is plate rubber bearing, the abutment is gravity abutment, and the deck pavement for asphalt concrete.

Bridge detection results

Treatment plan

Findings

To coat anti-corrosion coating