首页> 外文会议>Fifth International Conference on Analysis of Discontinuous Deformation, ICADD-5 Oct 6-10, 2002 Beer Sheva, Israel >Dynamic block displacement prediction - validation of DDA using analytical solutions and shaking table experiments
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Dynamic block displacement prediction - validation of DDA using analytical solutions and shaking table experiments

机译:动态块位移预测-使用分析解决方案和振动台实验验证DDA

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The accuracy and validity of Discontinuous Deformation Analysis (DDA) is tested using analytical solutions and shaking table experiments. The displacement history of a single block on an inclined plane subjected to a sinusoidal loading function, with input frequencies ranging from 2.66 Hz to 8.6 Hz, is studied. DDA predicts accurately the measured displacements and it's evolution with time. Sensitivity analyses of the numeric control parameters show: 1) Artificial numeric damping is required if better accuracy is sought. For the case of a single block on an incline a reduction of the dynamic control parameter by 2% is recommended; 2) Accurate DDA solution is attained for high penalty (numeric spring stiffness) values, provided that the chosen time step is small enough to assure diagonal dominance of the global stiffness matrix; 3) For a given time step size a sensitivity analysis of the numeric spring stiffness should be performed to detect ill conditioning or loss of diagonal dominance.
机译:使用分析解决方案和振动台实验测试了不连续变形分析(DDA)的准确性和有效性。研究了单块在斜面上受正弦荷载作用的位移历史,输入频率范围为2.66 Hz至8.6 Hz。 DDA可以准确预测测得的位移及其随时间的变化。数控参数的灵敏度分析表明:1)如果需要更好的精度,则需要人工数值阻尼。对于斜坡上的单个块,建议将动态控制参数降低2%; 2)只要选择的时间步长足够小以确保整体刚度矩阵的对角优势,就可以获得高罚分(数值弹簧刚度)值的准确DDA解决方案; 3)对于给定的时间步长,应进行弹簧刚度数值的敏感性分析,以检测不良状况或对角线优势度的损失。

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