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The Research of Health Monitoring and Damage Identification Based on the Difference of Modal Curvature for Simply Supported Beam

Author: HuaWeiPan
Tutor: DiShengKui
School: Lanzhou University of Technology
Course: Bridge and Tunnel Engineering
Keywords: Bridge Health Monitoring Damage Identification Modal curvature difference Natural frequency Modal Analysis
CLC: U446
Type: Master's thesis
Year: 2010
Downloads: 68
Quote: 1
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Abstract


Most engineering structures subjected to earthquakes, fires and other natural disasters, or long-term fatigue loads and corrosive effect, often cause structural damage, damage accumulation, gradually increase their degree of danger. Structural damage judgments and the damage to determine the location, you can help people repair or change the structure of the operation and use of the structure in real time, in order to reduce the level of accumulation of structural damage and reduce economic losses. Structural damage identification is an emerging research directions in civil engineering, has not yet formed a unified solution theory and method development is still in its infancy. This paper uses curvature difference modal method of beam bridge structure damage identification study, divided into five chapters, specific studies as follows: (1) sets out the significance of the bridge structure damage identification, content and methods, as well as at home and abroad at this stage in damage identification research in the field of the status quo and research, and the scope of this study and the research content. (2) discusses the large bridge health monitoring and security detection, as well as health monitoring and security detection theory to explain the significance of the bridge structural health monitoring. (3) Charpy principle of virtual work in the different load cases, the use of structural mechanics, to derive the Charpy bridge damage the curvature difference before and after formula obtained Charpy curvature difference modal indicators of damage location and damage the extent relevant conclusions, and describes the relationship between strain and curvature, and thus with shapes and strain the two methods can be order curvature modal curvature difference in the actual testing process provides a theoretical basis to prove the method of structural damage positioning with high accuracy and sensitivity. (4) discussed in detail the theoretical basis of the curvature of the modal analysis, the analysis of the curvature of the modal strain relations between the modal and modal shape; respectively vibration die state and seeking curvature modal strain the two methods, damage simulation model of Charpy curvature difference modal method, the text will be divided into five conditions analyzed, studied and compared the position of a single injury and damage the ability to identify the location of multiple injuries, and different degree of injury for structure impact damage identification and study the changes of the natural frequency of the structure before and after the injury. The numerical simulation results demonstrate the feasibility, effectiveness and applicability of the the curvature difference modal damage identification girder bridge damage identification. (5) The test method to verify the effectiveness of the curvature difference in reality testing mode. (6) summarizes the content and results of this research, and pointed out that the use of curvature difference modal damage identification problems exist in the bridge structure damage identification and health monitoring.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge test observations with the test
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