Seismic experimental study on a concrete pylon from a typical medium span cable-stayed bridge
According to the current seismic design codes of bridges in China, cable-stayed bridges have been usually required to remain elastic even subjected to strong earthquakes. However, the possibilities of pylon plastic behavior were revealed in recent earthquake damages. The lack of due diligence in the nonlinear seismic behavior of the pylon has caused a blurry understanding about the seismic performance of such widely built though less strong earthquake experienced structures. In light of this point, a 1/20 scaled concrete pylon model which from a typical medium span cable-stayed bridge was designed and tested on the shaking table longitudinally. The dynamic response and seismic behavior of the pylon were measured, evaluated and compared to reveal its vulnerable parts and nonlinear seismic performance. The results show that most parts of the concrete pylon remain elastic even under very strong excitations, which means a sufficient safety margin for current pylon longitudinal design. The most vulnerable parts of the pylon appeared first at the pylon bottom region, cracks opening and closing at the pylon bottom were observed during the test, and then extended to the lower column and middle column around the lower strut.
Keywordscable-stayed bridge pylon shaking table test seismic behavior
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This research was finically supported by the National Natural Science Foundation of China (Grant No. 51478338).
- 1.Ministry of Transportation of the People’s Republic of China. Guidelines for Seismic Design of Highway Bridges (GSDHB), JTG/ T B02-01-2008. Beijing: China Communications Press, 2008 (in Chinese)Google Scholar
- 7.Miyamoto H K, Gilani A S J, Wada A, Ariyaratana C. Limit states and failure mechanisms of viscous dampers and the implications for large earthquakes, 2010, 39(11): 1279–1297Google Scholar
- 13.Caetano E, Cunha A, Taylor C A. Investigation of dynamic cabledeck interaction in a physical model of a cable-stayed bridge. Part I: Modal analysis. Earthquake Engineering and Structure Engineering, 2000, 29(4): 481–498Google Scholar
- 14.Caetano E, Cunha A, Taylor C A. Investigation of dynamic cabledeck interaction in a physical model of a cable-stayed bridge. Part II: Seismic response. Earthquake Engineering and Structure Engineering, 2000, 29(4): 499–521Google Scholar
- 15.Wang J J, Zhang X T, Fan L C, Wang Z Q, Chen H, Zhou M, Li S Y, Mo H L, Ni Z J. A brief introduction to the shaking-table test of Liede Bridge. In: Proceedings of 4th PRC-USWorkshop on Seismic Analysis and Design of Special Bridges, Advancing Bridge Technologies in Research, Design, Construction and Preservation. Chongqing, 2006, 187–198Google Scholar
- 18.Harris H G, Sabnis G M. Structural Modeling and Experimental and Experimental Techniques. 2nd ed. Boca Raton: CRC Press, 1999Google Scholar
- 19.Xiang H, Li R, Yang C. Simplified seismic calculation of cablestayed bridge with suspension system. Structural Engineers, 1986, 1: 64–69 (in Chinese)Google Scholar
- 20.Chopra A K. Dynamic of Structures: Theory and Applications to Earthquake Engineering. Upper Saddle River: Prentice Hall, 2006Google Scholar