Modeling “unilateral” response in the cross-ties of a cable network: Deterministic vibration |
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Authors: | Gian Felice Giaccu Luca Caracoglia Bernardo Barbiellini |
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Institution: | 1. Department of Architecture, Design and Urban Planning, University of Sassari, 07041 Alghero, Italy;2. Department of Civil and Environmental Engineering, 400 Snell Engineering Center, Northeastern University, 360 Huntington Avenue, Boston, MA 02115, USA;3. Department of Physics, Northeastern University, Boston, MA 02115, USA |
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Abstract: | Cross-ties are employed as passive devices for the mitigation of stay-cable vibrations, exhibited on cable-stayed bridges under wind and wind-rain excitation. Large-amplitude oscillation can result in damage to the cables or perceived discomfort to bridge users. The “cable-cross-ties system” derived by connecting two or more stays by transverse cross-ties is often referred to as an “in-plane cable network”. Linear modeling of network dynamics has been available for some time. This framework, however, cannot be used to detect incipient failure in the restrainers due to slackening or snapping. A new model is proposed in this paper to analyze the effects of a complete loss in the pre-tensioning force imparted to the cross-ties, which leads to the “unilateral” free-vibration response of the network (i.e., a cross-tie with linear-elastic internal force in tension and partially inactive in compression). |
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