Abstract In order to analyze the dynamic characteristics of the tethers of a submerged floating tunnel subjected to road undulation excitation, a non-linear vibration equation of tethers was set up by taking the sag of the tether into account. The vibration response of the frequency-domain and time-history analysis of the tethers was obtained by applying the pseudo-excitation method and the Runge-Kutta method. Effects of the damping ratio and the initial tension of the tethers, track power spectrum and vehicle speed on the vibration response of the tethers were analyzed. It may be concluded that the larger the damping ratio and initial tension of the tethers the smaller the displacement power spectrum density of the tethers; the displacement at the middle position of the tethers increases gradually as the vehicle speed increases; and due to the influence of the equivalent linearization, the displacement root mean square obtained by the frequency-domain analysis is smaller than that of the time-domain analysis.
Abstract：
In order to analyze the dynamic characteristics of the tethers of a submerged floating tunnel subjected to road undulation excitation, a non-linear vibration equation of tethers was set up by taking the sag of the tether into account. The vibration response of the frequency-domain and time-history analysis of the tethers was obtained by applying the pseudo-excitation method and the Runge-Kutta method. Effects of the damping ratio and the initial tension of the tethers, track power spectrum and vehicle speed on the vibration response of the tethers were analyzed. It may be concluded that the larger the damping ratio and initial tension of the tethers the smaller the displacement power spectrum density of the tethers; the displacement at the middle position of the tethers increases gradually as the vehicle speed increases; and due to the influence of the equivalent linearization, the displacement root mean square obtained by the frequency-domain analysis is smaller than that of the time-domain analysis.
.Dynamic Response of the Tethers of a Submerged Floating Tunnel Caused by Road Undulation Excitation[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(5): 115-121
2017, Vol. 54 