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Computers and Concrete Volume 17, Number 2, February 2016 , pages 241-253 DOI: https://doi.org/10.12989/cac.2016.17.2.241 |
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Effect of prestressing on the natural frequency of PSC bridges |
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Soobong Shin, Yuhee Kim and Hokyoung Lee
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| Abstract | ||
| Depending on the researcher, the effect of prestressing on the natural frequency of a PSC (prestressed concrete) structure appear to have been interpreted differently. Most laboratory tests on PSC beams available showed that the natural frequency is increased appreciably by prestressing. On the other hand, some other references based on field experience argued that the dynamic response of a PSC structure does not change regardless of the prestressing applied. Therefore, the deduced conclusions are inconsistent. Because an experiment with and without prestressing is a difficult task on a full size PSC bridge, the change in natural frequency of a PSC bridge due to prestressing may not be examined through field measurements. The study examined analytically the effects of prestressing on the natural frequency of PSC bridges. A finite element program for an undamped dynamic motion of a beamtendon system was developed with additional geometric stiffness. The analytical results confirm that a key parameter in changing the natural frequency due to prestressing is the relative ratio of prestressing to the total weight of the structure rather than the prestressing itself. | ||
| Key Words | ||
| prestressing; natural frequency; PSC bridge; laboratory test; geometric stiffness; total weight | ||
| Address | ||
| Soobong Shin and Yuhee Kim: Department of Civil Engineering, INHA University, 100 Inha-ro, Nam-gu, Incheon 22212, Korea Hokyoung Lee: Korea Bridge Institute Co., 252 Gilju-ro,Wonmi-gu, Bucheon-si, Gyeonggi-do 14548, Korea | ||