Continuous rigid frame bridge prestress damage identification method based on deflection monitoring

Abstract

The invention discloses a continuous rigid frame bridge prestress damage identification method based on deflection monitoring. The continuous rigid frame bridge prestress damage identification method comprises the following steps: I, establishing a bridge deflection monitoring system, that is, the bridge deflection monitoring system comprises n deflection monitoring devices and one data acquisition device, and the n deflection monitoring devices are respectively arranged on n deflection monitoring points; II, monitoring deflection of a bridge, namely, respectively monitoring deflection data of n deflection monitoring points on a main beam by using the bridge deflection monitoring system in real time, and synchronously transmitting the monitored deflection monitoring data to data processing equipment; III, identifying prestress damage, namely, establishing a finite element model of the bridge, processing the bridge deflection monitoring data, acquiring deflection data caused by prestress damage, establishing a damage identification rigidity matrix and identifying prestress damage. The continuous rigid frame bridge prestress damage identification method is simple in step, reasonable in design, convenient to realize, good in use effect, capable of easily and conveniently completing the prestress damage identification process of a continuous rigid frame bridge, and relatively high in identification result reliability.

Description

technical field [0001] The invention belongs to the technical field of bridge health monitoring, in particular to a method for identifying prestress damage of a continuous rigid frame bridge based on deflection monitoring. Background technique [0002] The continuous rigid frame bridge is a continuous girder bridge with piers and girders consolidated. Multi-span rigid frame bridges and multi-span continuous-rigid frame bridges whose main spans are continuous girders both adopt prestressed concrete structures, and more than two main piers are consolidated with pier beams, which have the advantages of T-shaped rigid frame bridges. At present, a large number of prestressed continuous girder bridges (also known as "continuous rigid frame bridges") have been built on my country's main highways, and some of the continuous rigid frame bridges in use have varying degrees of mid-span deflection, web and Defects such as floor cracking have long been widely concerned by bridge circles ...

AI Technical Summary

Problems solved by technology

[0003] The detection of bridge prestress damage has extremely far-reaching significance for bridge evaluation and maintenance and reinforcement. If the degree of prestress damage of the structure cannot be accurately detected, the condition of the bridge will not be accurately grasped, resulting in poor pertinence of maintenance and reinforcement. When the prestress damage is too large, Major accidents may also occur, resulting in the loss of people's lives and property

[0004] At present, there are mainly two methods for prestressed damage detection: one is to open holes in the original structure to expose the steel strands, and then use testing equipment for testing. The prestress damage status of the excavated part has a limited degree of grasp of the effective prestress state of the bridge structure; the other is nondestructive testing technology, which develops rapidly because of its small damage to the structure and can quickly grasp the structural status macroscopically. The hot spot of research has also achieved certain results, but there are no complete research results, and the reliability of the detection results is poor

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