CAJ | 학술논문

讨论了利用ANSYS和LS－DYNA程序进行深覆盖土层地震反应时域计算时所涉及的几个问题。综合前期研究成果，通过对比通用程序的数值计算结果，分析了数值计算时土层计算范围的选取及单元网格划分、阻尼矩阵的形成等对计算精度的影响。分析结果表明：在确定深覆盖土层阻尼矩阵的比例系数时，土层基频与地震激励主要特征频率之间的关系是一个重要影响因素，当前者小于后者，特别是远小于后者时，应基于土层的基频与地震激励的主要特征频率来形成阻尼矩阵的比例系数；竖向、横向网格尺寸及人工边界的选取会对计算的结果造成显著影响。
토론료이용ANSYS화LS－DYNA정서진행심복개토층지진반응시역계산시소섭급적궤개문제。종합전기연구성과，통과대비통용정서적수치계산결과，분석료수치계산시토층계산범위적선취급단원망격화분、조니구진적형성등대계산정도적영향。분석결과표명：재학정심복개토층조니구진적비례계수시，토층기빈여지진격려주요특정빈솔지간적관계시일개중요영향인소，당전자소우후자，특별시원소우후자시，응기우토층적기빈여지진격려적주요특정빈솔래형성조니구진적비례계수；수향、횡향망격척촌급인공변계적선취회대계산적결과조성현저영향。
Several problems in seismic response analysis of soil layer with deep deposit were discussed using ANSYS and LS-DYNA.The effects of some factors,such as,selection of calculation scope of soil layer,division of mesh elements,formation of damping matrix,etc.calculation accuracy were analyzed by comparing the numerical results obtained with the general programs.Numerical examples demonstrated that the relationship between the fundamental frequency of soil layer and the predominant frequency of earthquake excitation is an important factor to affect calculation accuracy;when the former is smaller than the latter,especially,much smaller than the latter,the proportional coefficients in damping matrix should be formed with the two frequencies;the vertical and horizontal grid sizes and the selection of artificial boundary have a significant influence on calculation results.