Dynamic Analysis of a Real Footbridge Structure in a Najaf City
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 2, Issue 2
Abstract
The presented study consists of a dynamic analysis of a real pedestrian bridge structure of about 35m span over the highway connect Kufa and centre city of Najaf (Iraq). The main objective of this analysis were to assess whether the dynamic properties of footbridge structure meets the main safety requirements with the appropriate verification criteria. The extracted dynamic properties of the structural bridge model are natural frequency and mode shape. ANSYS software is used to perform the analysis by the way of APDL method. In this study, the first seven vibration modes of the bridge model are extracted. The dynamic characteristics extracted by modal analysis of the adopted bridge structural model exhibited the uncomfortable of vibration modes compared with European standards.For any structure has own natural dynamic behaviour depend on its stiffness and mass. The dynamic behaviour of a structure is represented by dynamic properties such as natural frequency and mode shape. The modal analysis method is applied to extract the dynamic properties of the structure [1]. If the structure excited by the external force has frequency close to the it’s natural frequency, the resonance will occur and that means the structure will face higher vibrations [2]. The changes of the modal properties are related with geometry, material properties and mass of the structure. In the design of the structure, the extracted modal properties using dynamic analysis helps to specify the weakness that needs modifications. So, calculating the natural frequency and mode shape of a vibrating structure are a common types of dynamic analysis and they are called “eignvalue and eigenvector analyses” respectively
Authors and Affiliations
Saad Al Wazni, Alaa Abdalabbas, Roqia Hayder, Zainab Mierr
Keywords
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- EP ID EP606790
- DOI 10.32474/TCEIA.2018.02.000133
- Views 54
- Downloads 0
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