Bridge Performance Recovery Test after Strengthening with a Prestressed CFRP Laminate

Abstract

This paper introduces the strengthening of a concrete bridge using a CFRP laminate anchorage system and describes the static and dynamic test process, including the loading method and the test results. This paper compares the stress, strain, and deformation of each key section before and after reinforcement under static loads, moving loads, braking vehicles, and jumping vehicles to demonstrate the strengthening effect of the bridge and the performance of the CFRP laminate. The CFRP laminate anchorage system effectively restores the structural elastic properties of the bridge, enabling the prestressed CFRP laminates and the bridge structure to synergistically function as a composite, exhibiting exceptional operational performance. After reinforcement, the maximum dynamic deflection in the middle span after reinforcement decreases by 25.73%, and the maximum dynamic strain in the middle span decreases by 18.00%; under the jumping vehicle, the damping ratio decreases by 43.69%. By strengthening with prestressed CFRP, the original damaged bridge can have its performance restored and its service life extended, and the need for bridge demolition and reconstruction is avoided. This brings about social benefits by saving raw materials, reducing demolition waste, and protecting the environment.