Vibration based system identification of cable stayed bridge

Pao Yue-kong Library Electronic Theses Database

Vibration based system identification of cable stayed bridge


Author: Jing, Yin Song
Title: Vibration based system identification of cable stayed bridge
Degree: M.Sc.
Year: 2013
Subject: Cable-stayed bridges -- Vibration.
Cables -- Vibration
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Construction and Environment
Pages: v, 131 p. : col. ill. ; 30 cm.
Language: English
InnoPac Record:
Abstract: Dynamic testing and analytical technique of structures originate in aviation, aerospace, automotive and machinery, which is producing in foreign countries for assessment of safety and damages. And it is referred to as the Modal Testing. The work in this dissertation aims to provide a more efficient method to detect the vibration with theory of finite element method and access the influence of analytical and experimental cases as well as putting the assumption into practice. Finite element method is widely used nowadays. The bridge is separated into 20 one - meter - long elements, and a moving vehicle is installed on the bridge to imitate and input exciting force at different locations in order to replace present monitoring methods in this dissertation. Sensors are imitated to be installed on the nodes only. This practice will imitate to install exciters and active incentive structural members of vibration to overcome the problem of uncertain diagnosis of dynamic structural performance evaluation and random pulse excitation source which can't be measured. The key issue is the analysis of structural mechanic is to provide a new way of detecting the damage. A detailed analysis of the cable stayed bridge will be conducted in the project according to the Frequency response function. Extracting the key dynamic characteristics of the with vehicle - structure is the based theory of giving comments to the critical range of dominating factor. The actual requirement of the sensors integrated in the structure of the dynamic development of the diagnostic system is needed, and its effectiveness and advanced sensor system solutions with taking into account the economy, rationality and practicality should be analyzed as well. Frequency response can be analyzed accurately as the theoretical basis for the development of advanced system identification and modal identification technology. At the same time, a comparison based on FRF with a real case of Stonecutters Bridge will be studied in order to estimate the acceptance of the method.

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