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In order to improve the application of viscoelastic boundary in the vibration input of elastic foundation and realize the ground motion input of flexible foundation,the study of dynamic artificial boundary and its seismic wave input method on elastic and flexible foundations is systematically carried out.For the homogeneous elastic foundation,the effects of different values of spring stiffness coefficient,mesh size and model truncation boundary are analyzed.When the bottom boundary and the side boundary are both set to viscoelastic boundaries,the current different methods for determining the spring stiffness coefficient are feasible.The mesh size should be less than 1/20 of the wavelength,and the truncation boundary range does not need to take into account the upper structure size.For the layered flexible foundation at regular levels,the bottom boundary can be set to the viscoelastic boundary.When the side boundary is set to truncation free boundary,the width of the truncation boundary should be no less than 15 times the height of the foundation.When the side boundary is set to the viscoelastic boundary,the width of the cutoff boundary should be no less than 2 times the height of the foundation.For irregularly layered flexible foundations,the bottom boundary can be set to the viscous boundary,and the side boundary can be set to the truncation free boundary,the width of which should be no less than 10 times the height of the foundation.The above-mentioned setting methods of dynamic artificial boundary can control the maximum relative error to about 5%,and meet the requirement of engineering precision.
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Basic Information:
DOI：10.20040/j.cnki.1000-7709.2020.05.025
China Classification Code:TU435
Citation Information:
[1]DONG Kai,MI Zhan-kuan,Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources.Seismic Wave Input Methods of Artificial Boundary on Elastic and Flexible Foundations[J].Water Resources and Power,2020,38(05):101-105.DOI:10.20040/j.cnki.1000-7709.2020.05.025.
Fund Information:
国家重点研发计划（2017YFC0804605）; 国家自然科学基金项目（51539006）; 中央级公益性科研院所基本科研业务费专项资金项目（Y317005）
2020-05-25
2020-05-25