Three Dimensional Vibration Effects of Foundation Induced by High-Speed Moving Loads
High-speed railway has gained rapid development in China.Running speeds on the es tablished lines are no less than 200 km/h at the beginning stage and up to 300 km/h for many main high-speed railways.The running speed is likely to be increased in the future.Compared to low and middle speed railways, dynamic effects induced by high-speed train are obviously different, espe cially in regions with poor quality soils.To investigate the vibration effect of foundation due to highspeed moving loads, a subroutine complied with Fortran language is added on the platform of the computer software ABAQUS to simulate one or more different types of moving load (s).To eliminate wave reflection at computational boundary and to remove the limitation of traditional viscoelastic boundary that is valid for dynamic calculation but invalid for static calculation, a special boundary is added to ABAQUS based on the theory of three dimensional static-dynamic unified viscoelastic ar tificial boundary and its correctness and validity are verified.Considering nonlinearity of material, the vibration effects of foundation are studied for the two cases: (i) when the speed of a moving load is larger than the shear wave velocity but less than the compression wave velocity; and (ii) when the speed of a moving load is larger than the compression wave velocity of foundation soil.And, vibration displacement, vibration velocity, vibration acceleration and dynamic stresses are ob tained.Results indicate that the stress state of soil elements keep changing all the time during the process of load moving and three stress axes correspondingly rotate continuously.For comparison, rotations of axis in vertical plane due to one load with moving speed less than the shear wave veloci ty of foundation soil are presented.
high-speed moving loads static-dynamic unified artificial boundary vibration effect rotations of principal stress axes
F.C.Xue J.M.Zhang
State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China Institute of Geotechnical Engineering, School of Civil Engineering, Beijing, China
国际会议
第六届国际环境振动学术研讨会(6th International Symposium on Environmental Vibration)(ISEV2013)
上海
英文
161-167
2013-11-08（万方平台首次上网日期，不代表论文的发表时间）