Energy dissipation analysis and optimum design on a flexible rock-shed for rockfall protection

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 216-222.

Wang Min1 Shi Shao-qing Liu Ying-feng1,2 Cui Lian-ming1

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Abstract

The flexible rock-shed for rockfall protection is composed of a steel vaulted structure and ring nets. The existing researches show that the stiffnesses of the rock-shed internal components are mismatched and the most serious plastic distortion occurs on the steel vaulted structure because of some weak components in the flexible rock-shed obstructing the load transfer path under the impact of rockfall. These defects would increase the maintenance cost and limit the engineering application. In order to optimize the flexible rock-shed and decrease the plastic distortion of the steel vaulted structure, a numerical model was employed to investigate the energy absorbed by each component in the flexible rock-shed based on results of the full-scale model experiments and numerical simulations, and a design method was presented to improve the connections between the components of the flexible rock-shed. The numerical simulation results show that: compared to the original flexible rock-shed, the energy absorbed by the steel vaulted structure of the improved flexible rock-shed is significantly decreased and the distortion is improved. In addition, a parametric study for the improved flexible rock-shed was implemented and an optimum design was presented.

Key words

/ flexible rock-shed；rockkfall；energy dissipation；impact；optimum design

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Wang Min1 Shi Shao-qing Liu Ying-feng1,2 Cui Lian-ming1. Energy dissipation analysis and optimum design on a flexible rock-shed for rockfall protection[J]. Journal of Vibration and Shock, 2018, 37(1): 216-222

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