土工建筑物动力真非线性分析的量化记忆模型  

Scale memory model for dynamic nonlinear analysis of earth structure

作　　者：迟世春[1] 刘怀林[1] 

机构地区：[1]大连理工大学土木工程系及海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《水利学报》2003年第10期51-59,共9页Journal of Hydraulic Engineering

摘　　要：运用量化记忆模型,将土工建筑物的动力真非线性分析中滞回圈上任意点的塑性模量映射为简单的分段线性关系,通过量化记忆和插值计算无量纲距离δ,进而确定塑性模量,从而使土工建筑物的动力真非线性分析简单易行。量化记忆(以下简称SM)模型先以弹塑性理论为基础,将单调加载情况下的应力-应变曲线的非线性剪切模量映射为量化模量在几何空间上的分段线性分布,再以Masing准则为基础,在循环加载情况下,对这种简化的几何分布进行变化调整,使其生成非线性变化的剪切模量。将非线性问题转化为线性问题进行处理,大大简化了非线性计算的复杂性。通过对某筑坝爆破料动力三轴试验曲线的拟合,可以看出量化记忆模型能很好地模拟土的滞回特性。The scale memory (SM) model is applied to simplify the determination of plastic modulus in dynamic nonlinear analysis of earth structure. The nonlinear shear modulus of hysteretic stressstrain relationship for monotone loading is mapped as a scaled magnitude in the geometric space and linearly distributed in arbitrary section of the curve. Then, the distrubution is adjusted to generate the linear shear modulus according to the Masing criterion under the condition of cyclic loading.Thus, the nonlinear problem is transformed into a linear problem and the calculation is greatly simplified.The parameters of the model are determined by the dynamic triaxial test data. It is found that the SM model can well simulate the hysteretic characteristics of the earth structure.

关 键 词：滞回圈 量化记忆模型 土的动力真非线性分析 

分 类 号：TU345[建筑科学—结构工程]