CAJ | 학술논문

随着对地震中场地土体振动的观察和分析的深入，土体反应在中、大地震动表现出的非线性和滞后性越加明显。对于土体场地反应分析实验中或者在记录的地震动中观察到的土体刚度的变化和能量的消散，现有的非线性场地反应分析方法不能同时在计算中表达出来。通过引用一个不依赖频率变化的黏性阻尼矩阵，借助滤频的方法在高频中减小过阻尼影响，对场地反应进行非线性计算分析。以DEEPSOIL计算程序计算天津滨海软土模型为例，分析比较使用该阻尼函数的一维非线性场地反应分析结果与等效线性分析结果，得出在大应变中非线性分析方法计算所得结果更符合实际情况。
수착대지진중장지토체진동적관찰화분석적심입，토체반응재중、대지진동표현출적비선성화체후성월가명현。대우토체장지반응분석실험중혹자재기록적지진동중관찰도적토체강도적변화화능량적소산，현유적비선성장지반응분석방법불능동시재계산중표체출래。통과인용일개불의뢰빈솔변화적점성조니구진，차조려빈적방법재고빈중감소과조니영향，대장지반응진행비선성계산분석。이DEEPSOIL계산정서계산천진빈해연토모형위례，분석비교사용해조니함수적일유비선성장지반응분석결과여등효선성분석결과，득출재대응변중비선성분석방법계산소득결과경부합실제정황。
With the in-depth study of observation and analysis of the motions of site soil during earthquake,the distinct non-linearity and hysteretic response of the soil have been found in medium and large motions of the earth. For the changes of stiffness and energy dissipation observed in both laboratory tests or during earthquake,the present method of site response analysis cannot represent them simultaneously in calculating. This paper conducts a non-linear one-dimensional site response analysis by introducing a frequency-independent viscous damping matrix which can decrease the over-damping at high fre-quency. With the example of the computation of Tianjin coastal soft soil model by using the program DEEPSOIL,thepaper does a comparative analysis of the result of non-linear 1-D and that of the equivalent linear site response analysis,and draws the conclusion that in large strain the result of non-linear 1-D site response analysis is more accordant with the practical situation than that of the equivalent linear analysis.