Abstract
The dynamic behaviors of the submerged floating tunnel, a buoyant structure of high slenderness, are a matter of concern since it is surrounded by the huge hazardous effects called hydrodynamic, seismic and functional action. Modal analysis and Rayleigh damping coefficients play a significant role in dynamic analysis, but it is not sufficiently simple to predict the reasonable damping coefficients named α and β. The present paper outlines the modal analysis and the calculation of Rayleigh damping coefficients that provide the natural frequencies, mode shapes, mode’s motion as well as coefficients α and β. To compute the Rayleigh damping coefficients, 2–10% damping to the critical damping has been assumed for this analytical study. For the analysis, an FEA-based software ANSYS is utilized successfully. It has been seen that the fundamental frequency and Rayleigh damping coefficients (α = 0.946 and β = 0.00022) of the SFT are reasonably high and it is under noticeable damping.
Highlights
With the racing era of modern science and technology, structural engineering is going ahead to rescue the new challenges
submerged floating tunnel (SFT) tube is by and large inundated within the profundity of 20–30 m beneath the water, once collision mishaps or fear-based oppressor assaults happen amid its operation; the result is more genuine [7]
Even though SFT is put beneath the water surface at a certain profundity, the surface wave has an imperative impact on its energetic reaction due to the slenderness of structure
Summary
With the racing era of modern science and technology, structural engineering is going ahead to rescue the new challenges. The rectangular section is considering the submerged structures in a different situation because of its feasible carriageway because the elliptical or circular section needs more area compared to the rectangular one with having some specific feasibilities [9] Another cross-sectional configuration of the tunnel is one or more circular tubes holding the traffic lanes linked by frames and hidden by a shell. There are numerous different sources of gradually changing natural powers of low size As such, they would regularly not do any hurt to the SFT and its components in case it had not been for the threat of resonance with major vibration modes of the burrowing tube. This, in any case, may have a huge fetched punishment since it, for the most part, would require a moderately huge number of anchoring points and tethers
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