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Keywords: bridge, cable, traffic, parametric resonance, cross-tie, hysteretic damping, wind, tuned mass damper.

Summary

The use of cross-ties for the reduction of cables oscillations, in a cable-stayed bridge, has been recently proposed by many investigators. Particularly, Yamaguchi [1] has performed a series of relevant tests. Whereas, Caracoglia [2] has tried analytically a combination of cross-ties with viscous dampers. In the present work, a series of simplified numerical experiments are performed, in order to demonstrate the effect of hysteretic stress-strain behavior of the cross-ties on the reduction of cables oscillations. First, an isolated pretensioned cable is analysed, subjected to its self-weight and to parametric resonance due to its axial force variation with time, because of its support displacements on the deck and pylon due to traffic. Then, the above cable is connected to a parallel one, with shorter length, by a very thin pretensioned wire (cross-tie), exhibiting hysteretic stress-strain behavior. Further, one more tie connects the second cable with the deck. Then, an isolated pretensioned cable is considered, subjected to successive pulses of a strong wind drag force. Afterwards, the above cable is connected by a thin cross-tie, with hysteretic stress-strain behavior, to another parallel identical cable and the wind force is applied only to the one cable. Diagonal anti-wind bars are tried, connecting the main cables with the pylon and the deck. Finally, an additional small mass (tuned mass damper) is used on the one cable of the main cables. It is observed, in the above seven applications, that only one very thin wire (cross-tie), with hysteretic stress-strain behavior, connecting two parallel main cables of a cable-stayed bridge to each other and with the deck, proves effective in gradually reducing the oscillation amplitudes of the cables, if the two cables are not identical, for example if they have different lengths, which means different masses, weights and geometric stiffnesses or if one of them has an additional small mass (tuned mass damper). In both above cases, the two parallel cables have different dynamic characteristics, so that they vibrate with different natural periods, that is they are not in phase to each other, which implies a significant gradual suppression of their oscillatory amplitudes.

References

1: Yamaguchi H., Nagahawatta H.D., "Damping effects of cable cross-ties in cable-stayed bridges", Journal of Wind Engineering and Industrial Aerodynamics, Vol. 54/55, 35-43, 1995. doi:10.1016/0167-6105(94)00027-B
2: Caracoglia L., Jones N.P., "Passive hybrid technique for the vibration mitigation of systems of interconnected stays", Journal of Sound and Vibration, Vol. 307, 849-864, 2007. doi:10.1016/j.jsv.2007.07.022

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 88 PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and M. Papadrakakis Paper 270 Simplified Numerical Experiments on the Effect of Hysteretic Damping of Cross-Ties on Cable Oscillations P.G. Papadopoulos¹, A. Diamantopoulos¹, P. Lazaridis¹, H. Xenidis¹, C. Karayannis² and S. Kyrgidis¹ ¹Department of Civil Engineering, Aristotle University of Thessaloniki, Greece ²Department of Civil Engineering, Democritus University of Thrace, Xanthi, Greece doi:10.4203/ccp.88.270 purchase the full-text of this paper Full Bibliographic Reference for this paper P.G. Papadopoulos, A. Diamantopoulos, P. Lazaridis, H. Xenidis, C. Karayannis, S. Kyrgidis, "Simplified Numerical Experiments on the Effect of Hysteretic Damping of Cross-Ties on Cable Oscillations", in B.H.V. Topping, M. Papadrakakis, (Editors), "Proceedings of the Ninth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 270, 2008. doi:10.4203/ccp.88.270 Keywords: bridge, cable, traffic, parametric resonance, cross-tie, hysteretic damping, wind, tuned mass damper. Summary The use of cross-ties for the reduction of cables oscillations, in a cable-stayed bridge, has been recently proposed by many investigators. Particularly, Yamaguchi [1] has performed a series of relevant tests. Whereas, Caracoglia [2] has tried analytically a combination of cross-ties with viscous dampers. In the present work, a series of simplified numerical experiments are performed, in order to demonstrate the effect of hysteretic stress-strain behavior of the cross-ties on the reduction of cables oscillations. First, an isolated pretensioned cable is analysed, subjected to its self-weight and to parametric resonance due to its axial force variation with time, because of its support displacements on the deck and pylon due to traffic. Then, the above cable is connected to a parallel one, with shorter length, by a very thin pretensioned wire (cross-tie), exhibiting hysteretic stress-strain behavior. Further, one more tie connects the second cable with the deck. Then, an isolated pretensioned cable is considered, subjected to successive pulses of a strong wind drag force. Afterwards, the above cable is connected by a thin cross-tie, with hysteretic stress-strain behavior, to another parallel identical cable and the wind force is applied only to the one cable. Diagonal anti-wind bars are tried, connecting the main cables with the pylon and the deck. Finally, an additional small mass (tuned mass damper) is used on the one cable of the main cables. It is observed, in the above seven applications, that only one very thin wire (cross-tie), with hysteretic stress-strain behavior, connecting two parallel main cables of a cable-stayed bridge to each other and with the deck, proves effective in gradually reducing the oscillation amplitudes of the cables, if the two cables are not identical, for example if they have different lengths, which means different masses, weights and geometric stiffnesses or if one of them has an additional small mass (tuned mass damper). In both above cases, the two parallel cables have different dynamic characteristics, so that they vibrate with different natural periods, that is they are not in phase to each other, which implies a significant gradual suppression of their oscillatory amplitudes. References 1 Yamaguchi H., Nagahawatta H.D., "Damping effects of cable cross-ties in cable-stayed bridges", Journal of Wind Engineering and Industrial Aerodynamics, Vol. 54/55, 35-43, 1995. doi:10.1016/0167-6105(94)00027-B 2 Caracoglia L., Jones N.P., "Passive hybrid technique for the vibration mitigation of systems of interconnected stays", Journal of Sound and Vibration, Vol. 307, 849-864, 2007. doi:10.1016/j.jsv.2007.07.022 purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £145 +P&P)
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