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Researched on Diseases Mechanism and Influence on Bridge Structure Result from Damage of Stayed Cable

Author: ChenYan
Tutor: DengNianChun
School: Guangxi University of Technology
Course: Structural Engineering
Keywords: Cable-stayed bridge Cable-stayed Disease survey Damage Mechanism Vulnerability
CLC: U445.7
Type: Master's thesis
Year: 2011
Downloads: 110
Quote: 0
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Abstract


The cable-stayed bridge is the main bridge type of long-span bridges, including cable-stayed are important components of the structure. As the cable-stayed long-term exposure to the natural environment, and exposed to a high degree of stress dynamic load effects alternation, prone to injury. When impact damage accumulated to a certain extent, be adjacent or similar components, leading to the the load effect weight distribution, and a serious threat to the safety of the service of the cable-stayed bridge structure. The study has important implications in order to protect the security during the operation of the cable-stayed bridge structure and extending its life, the damage mechanism of the cable-stayed and Cable Damage state under the cable-stayed bridge structure to respond to change. Based both stay cable disease investigation, analysis of cables disease damage mechanism to reveal the stay cables injury and failure process; preliminary discriminant analysis of the mechanics of the bridge structure, wearing cable in the cable-stayed bridge structure. Jiangxi sword eup Bridge as the background, the simulation analysis of the impact of the the stay cable damage on the full-bridge structure. The main contents are as follows: 1 in the country and abroad each stay cable disease and the appearance of the survey based on more than a dozen Block, from the two aspects of the environment, chemical corrosion damage and physical and mechanical damage of the cable-stayed diseases are summarized. The disease mainly in the form of PE protective layer damage, injury claim within the wire (or strand), anchor damage, cable vibration and parallel wire torsion. The cable-stayed chemical corrosion caused by the disease damage is divided into three basic types: the pure chemical corrosion of the wire in the corrosive medium, under the joint action of the load and the corrosive medium wire stress corrosion cycle alternating stress corrosion medium common under the condition of the wire to corrosion fatigue. Three damage mechanism were analyzed in detail. The cable vibration Disease, mainly triggered by external wind load cable stayed wind-induced vibration and parameters of the cable-stayed vibration caused due to the vibration of the cable-stayed bridge structure are summarized into two categories, the principle of vibration. From the production, transportation to the site construction process of the cable-stayed torsion. Proposed the the stay cables disease damage evolution course, first of cables protective layer in the atmosphere to aging, injury, destruction of failure; the same time, the steel wires inside the cable-stayed long in a high state of stress and long-term exposure to changes in load role in leading cable-stayed fatigue damage, structural bearing performance degradation; damage or failure of the cable-stayed protective layer of the cable-stayed steel wire corroded; cable-stayed under the joint action of the corrosive medium load stress corrosion phenomenon ; After cable-stayed a long period of stress corrosion and fatigue damage two factors together, when it reaches its material bearing limit state cable-stayed Failure of. The proposed cable-stayed stress amplitude (?) And cable tension luffing (?) As well as vibration state discriminant parameters to determine the vulnerability of the extent of the cable-stayed. And to Jiangxi sword eup Bridge as the background, the finite element model of the cable-stayed bridge, and analysis of the vulnerability of its cable; and stay cable cross-sectional area of ??the damage variable analog cable-stayed bridge structure in the cable-stayed varying degrees of damage in the state under the full-bridge structure response characteristics variation. The results show that: the damage or destruction of the cable-stayed their surrounding greater impact, the extent of its influence decreases with increasing distance from injury Sok No. position.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge Construction > Bridge maintenance, repair and remediation
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