Health Monitoring-Based Assessment of Reinforcement with Prestressed Steel Strand for Cable-Stayed Bridge
  • Kexin Zhang*, Tianyu Qi, Dachao Li, Xingwei Xue, Yanfeng Li
School of Traffic Engineering, Shenyang Jianzhu University, Shenyang, 110168, China
* Corresponding Author: Kexin Zhang. Email: jt_zkx@sjzu.edu.cn
(This article belongs to this Special Issue:Vortex-induced vibration of long-span bridges)
Received 09 February 2021; Accepted 08 June 2021 ; Published online 10 August 2021
Abstract
This paper presents the method of reinforcing main girder of reinforced concrete cable-stayed bridge with prestressed steel strands. To verify the effectiveness of external prestressed strand reinforcement method. Static load tests and health monitoring-based assessment were carried out before and after reinforcement. Field load test shows that the deflection and stress values of the main girder are reduced by 10%~20% after reinforcement, and the flexural strength and stiffness of the strengthened beam are improved. The deflection and strain data of health monitoring of the specified section are collected. The deflection of the second span is 4 mm~10 mm, the strain range of the upper edge of the second span is -10 με~-40 με, and the strain range of the lower edge is 30 με~75 με. These values show the deflection and strain values fluctuate within a prescribed range, verifying the safety of the bridge. The reinforcement method of prestressed steel strand is feasible and effective. It can provide reference basis for the application of external prestressed strand reinforcement technology in similar projects.
Keywords
Prestressed steel strand; reinforcement; cable-stayed bridge; load testing; health monitoring