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Dynamic Similitude Analysis for Establishing Scaled-Down Model to Predict Vibration Behaviour of Prestressed Concrete Bridge Girder
The present study aims to develop and validate the dynamic similitude requirements for scaled-down models of large-scale complex structures for studying their vibration characteristics. Field investigations of large complex structures is a highly difficult task, which necessitates the representation of the field structure (prototype) by scaling down the geometry of such structure (model) in order to have similar similitude conditions for both static and dynamic parameters of the prototype. In this study of dynamic similitude analysis, a standard prestressed concrete I-girder largely adopted for highway bridges is considered as the prototype structure. The main objective of this paper is to establish a reliable scaling method for dissimilar systems using two similitude methods such as dimensional analysis and energy-based method. To verify the proposed method of scaling, an eigenvalue analysis was formulated considering the prestress effect and is compared with the numerical simulations of the prototype and the model by evaluating the system properties such as natural frequency and mode shape for the maximum prestress level and without prestress level. After confirming the efficacy and feasibility of the proposed method using both the similitude methods, experimental investigations are performed on the scaled-down model and validated for a similar structure. Based on the frequencies obtained from the scaled-down model, the frequencies of the prototype structure are predicted by using the dynamic similitude methods. The results indicate that, by employing the dynamic similitude theorems, the established scale models are able to predict acceptable results to estimate the vibration characteristics of the prototype bridge. The success of the proposed method is that the scaling laws derived for both the similitude methods were identical and could be performed for any dissimilar model of complex structure without involving any other similitude techniques for arriving the scale model. The proposed methodology of scaling down the prototype bridge structure is very much useful for evaluating the dynamic properties of the prototype structure as well as to estimate the existing prestress in the age-old prestressed concrete bridges.
Dynamic Similitude Analysis for Establishing Scaled-Down Model to Predict Vibration Behaviour of Prestressed Concrete Bridge Girder
The present study aims to develop and validate the dynamic similitude requirements for scaled-down models of large-scale complex structures for studying their vibration characteristics. Field investigations of large complex structures is a highly difficult task, which necessitates the representation of the field structure (prototype) by scaling down the geometry of such structure (model) in order to have similar similitude conditions for both static and dynamic parameters of the prototype. In this study of dynamic similitude analysis, a standard prestressed concrete I-girder largely adopted for highway bridges is considered as the prototype structure. The main objective of this paper is to establish a reliable scaling method for dissimilar systems using two similitude methods such as dimensional analysis and energy-based method. To verify the proposed method of scaling, an eigenvalue analysis was formulated considering the prestress effect and is compared with the numerical simulations of the prototype and the model by evaluating the system properties such as natural frequency and mode shape for the maximum prestress level and without prestress level. After confirming the efficacy and feasibility of the proposed method using both the similitude methods, experimental investigations are performed on the scaled-down model and validated for a similar structure. Based on the frequencies obtained from the scaled-down model, the frequencies of the prototype structure are predicted by using the dynamic similitude methods. The results indicate that, by employing the dynamic similitude theorems, the established scale models are able to predict acceptable results to estimate the vibration characteristics of the prototype bridge. The success of the proposed method is that the scaling laws derived for both the similitude methods were identical and could be performed for any dissimilar model of complex structure without involving any other similitude techniques for arriving the scale model. The proposed methodology of scaling down the prototype bridge structure is very much useful for evaluating the dynamic properties of the prototype structure as well as to estimate the existing prestress in the age-old prestressed concrete bridges.
Dynamic Similitude Analysis for Establishing Scaled-Down Model to Predict Vibration Behaviour of Prestressed Concrete Bridge Girder
Iran J Sci Technol Trans Civ Eng
Seethalakshmi, B. R. (author) / Voggu, Srinivas (author)
2023-06-01
13 pages
Article (Journal)
Electronic Resource
English
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