Vehicle-tunnel coupled vibration analysis of submerged floating tunnel under random traffic flow

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (7) : 31-36.

LIN Heng1, WU Dongyan1, ZHAO Junliang1, XIANG Yiqiang2

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Abstract

Submerged floating tunnel (SFT) is a kind of cross-sea structure designed for future traffic. To study the vehicle-tunnel coupled vibration characteristics of SFT under the random traffic, the Monte Carlo method and finite element method are used to carry out the theories of random traffic flow and SFT respectively, considering the vehicle types, vehicle spacing and vehicle speed. Combining the Morison equation and the vehicle displacement coordinated relationship, an analytical element of the vehicle-tunnel coupled is proposed, and the vehicle-tunnel coupled vibration of SFT is numerically solved. The calculation results are discussed by the method of statistical distribution. The results show that the SFT has severe vehicle-tunnel coupled vibration under the high-volume random traffic load; the acceleration mean square value arms at the L/4 and L/2 positions of the SFT follows the normal distribution of probability distribution. In addition, the L/2 position is affected by the more obvious random traffic load; reducing the vertical tether stiffness or increasing the tether spacing can improve the vertical coupled vibration acceleration amplitude of SFT, but the improvement effect shows a trend of diminishing marginal effect.

Key words

submerged floating tunnel / random traffic flow / vehicle-tunnel coupled vibration / Mento Carlo method / acceleration mean square value

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LIN Heng1, WU Dongyan1, ZHAO Junliang1, XIANG Yiqiang2. Vehicle-tunnel coupled vibration analysis of submerged floating tunnel under random traffic flow[J]. Journal of Vibration and Shock, 2022, 41(7): 31-36

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