| 土的量化记忆模型及其参数确定 |
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| 引用本文： | 迟世春,宋振河.土的量化记忆模型及其参数确定[J].岩土力学,2004,25(1):77-81. |
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| 作者姓名： | 迟世春 宋振河 |
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| 作者单位： | 大连理工大学 海岸与近海工程国家重点实验室，辽宁 大连，116024 |
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| 摘 要： | 土的真非线性分析要求追踪应力-应变历史，寻求滞回圈上应力-应变的瞬时切线模量。由于地震荷载的随机性，实际土体的应力-应变历史轨迹非常复杂。基于传统模型的骨架曲线和滞回圈表达式进行这类分析的难度很大。作者介绍的量化记忆模型是为土的动力真非线性分析提出的，它是将单调加载情况下呈非线性变化的切线模量量化，记忆为一种分段线性分布的几何结构，并通过对这种结构加以变换，以描述循环加载情况下具有滞回特性土料的动应力-应变关系。在试验的基础上，运用非线性最小二乘法，确定了量化记忆模型中的 , , , , , 6个参数，并将量化记忆模型生成的应力-应变关系曲线与试验曲线进行了比较。结果表明，量化记忆模型是有效可行的。
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| 关 键 词： | 土动力学 本构模型 量化记忆模型 |
| 文章编号： | 1000-7598-(2004)01-0077-05 |
| 收稿时间： | 2002-10-14 |
| 修稿时间： | 2002年10月14 |
Scaled memory model and its parameters determination |
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| CHI Shi-chun,SONG Zhen-he.Scaled memory model and its parameters determination[J].Rock and Soil Mechanics,2004,25(1):77-81. |
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| Authors: | CHI Shi-chun SONG Zhen-he |
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| Institution: | State Key Lab of the Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | It is needed for dynamic nonlinear analysis of soil structures that to follows the history of the stress-strain and to evaluate the instantaneous tangential modulus of the stress-strain on hysteretic loop. Because the seismic loadings are arbitrariness, it is very complex that the trace of the stress-strain of the soil elements in the actual geotechnical engineering. It is different for this nonlinear analysis that is used the conventional expresses of the constitutive relationship of the soil dynamic behavior based on the skeleton curve and hysteretic loop. In this paper, the scaled memory (SM) model is introduced for dynamic nonlinear analysis of soil structures. The SM translates the nonlinear variation of tangential modules during monotonic loading into a piecewise linear distribution geometrical relationship, which can easily to be modified to simulate hysteretic characteristics of soil during cyclic loadings, it also can simulate the dynamic stress-strain response of arbitrary cyclic loadings. In order to determine the parameters of the SM model. An analysis program of nonlinear least square method is developed. The parameters of the SM model, such as E,maxs,mins,0h,r,s, are defined by fitting test results. To compare the dynamic stress-strain relationships between the tests and the calculated results by SM model, it is shown that the SM model is capable and practicable. |
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| Keywords: | soil dynamics constitutive relationship model scaled memory model |
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