University of Twente Student Theses
Investigations into Temperature Distribution on Bridge Vibration Parameters : The UT Campus Bridge
Abdelbary, S.M.M. (2024) Investigations into Temperature Distribution on Bridge Vibration Parameters : The UT Campus Bridge.
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| Abstract: | Structural health monitoring (SHM) has a critical role ensuring safety and integrity of structures through analyzing data gathered from sensors implemented on the structures. Through advanced SHM methodologies, the proposed research investigates the effect of temperature distribution on the UT Campus footbridge structure parameters. The influence of the temperature variations on structural dynamics, is rather underestimated. Temperature variation can obscure mode shapes and natural frequencies of structures affecting the accuracy of dynamic response assessment. Information about the UT Campus footbridge such as the geographical location and data collection points are gathered. Temperature data are collected from the sensors implemented on the bridge. With consideration of environmental conditions, such as solar exposure and seasonal temperature changes, the temperature data of 11 scenarios are analysed and visualized. Assessing the bridge response to user induced vibrations, particularly cyclists, an acceleration analysis was conducted. Similarly, to the temperature analysis, acceleration data are derived from contact sensors at specified locations on the bridge. Using Fast Fourier Transformation (FFT) , the raw acceleration data collected are transformed from time domain to frequency domain. Welch’s method is then applied in order to assess the dominant frequency peaks by estimating the power spectral densities. The dominant peaks visualized in a PSD plot refer to the natural frequency of the bridge. The research was able to identify the temperature distributions as the sensors on T1 and T5 located on girder C of the footbridge, recorded higher temperature variations throughout the scenarios compared to the temperature sensors T2 and T4 located on girder A. Six crossings corresponding to 6 temperature scenarios were analyzed showing natural frequencies ranging from 3.26 – 2.82 Hz. Across the 6 crossing the value of 2.82 Hz was identified to be out of bounds therefore the natural frequency of bridge in response to cyclists crossing were deducted to be in range of 3.2 – 3.26 Hz. The sixth crossing lies in the coldest scenario among other crossings. Therefore, this temperature drop followed by the frequency shift can give an identification of possible effect of temperature change on bridge dynamic parameters. Further, the research discusses the possible limitations of the study as well as further research to be conducted. |
| Item Type: | Essay (Bachelor) |
| Faculty: | ET: Engineering Technology |
| Programme: | Civil Engineering BSc (56952) |
| Link to this item: | https://purl.utwente.nl/essays/98616 |
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