心墙土料的动力参考剪应变
|
摘要
参考剪应变是土体动模量衰减曲线的归一化参数,它的确定关系到试验成果有效整理与土工建筑物地震动力分析的可靠性。传统采用定义求解参考剪应变的方法因为涉及动强度而不够简便。论文提出了另外两种求取参考剪应变的方法,即最大动剪模量折半的方法一和联立求解方程组的方法三,均不涉及动强度问题。其中方法一还具有概念清楚、求解简便等特点。三种方法计算得到的参考剪应变均能较好地归一动剪模量比衰减曲线,但阻尼比曲线的归一效果稍差。
Reference shear strain is a generalized parameter of the curve of dynamic shear modulus ratio versus dynamic shear strain of soil,and traditionally it has been calculated by the definition as the ratio of maximum dynamic shear stress over maximum dynamic shear modulus.This paper proposes two new methods that use normalized dynamic shear modulus ratio curve and solution of linear equations respectively,not involving dynamic strength of the soil.Comparison shows that all the three methods produce similar modulus-strain curves,but the first new method has advantages of clearer conceptualization and simpler calculation.
Reference shear strain is a generalized parameter of the curve of dynamic shear modulus ratio versus dynamic shear strain of soil,and traditionally it has been calculated by the definition as the ratio of maximum dynamic shear stress over maximum dynamic shear modulus.This paper proposes two new methods that use normalized dynamic shear modulus ratio curve and solution of linear equations respectively,not involving dynamic strength of the soil.Comparison shows that all the three methods produce similar modulus-strain curves,but the first new method has advantages of clearer conceptualization and simpler calculation.
引文
[1]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运科学研究,1996,(2):143-150.SHEN Zhujiang,XU Gang.Deformation behavior of rock materials under cyclic loading[J].Journal of Nanjing Hydraulic ResearchInstitute,1996,(2):143-150.(in Chinese)
[2]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of Soil Mechanics andFoundations Division,ASCE,1972,98(SM7):667-692.
[3]Hardin B O,Drnevich V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of Soil Mechanicsand Foundations Division,ASCE,1972,98(SM6):603-624.
[4]迟世春,刘怀林.土工建筑物动力真非线性分析的量化记忆模型[J].水利学报,2003,(10):51-59.CHI Shichun,LIU Huailin.Scale memory model for dynamic nonlinear analysis of earth structure[J].Journal of HydraulicEngineering.2003,(10):51-59.(in Chinese)
[5]俞培基,梁永霞,秦蔚琴.石灰岩人工砂的动剪横量和阻尼比[J].岩土工程学报,1988,10(4):57-63.YU Peiji,LIANG Yongxia,QIN Weiqin.Shear moduli and damping factors of artificial limestone sand[J].Chinese Journal ofGetechnical Engineering,1988,10(4):57-63.(in Chinese)
[6]栾茂田.土动力非线性分析中的变参数Ramberg-Osgood本构模型[J].地震工程与工程振动,1992,(2):69-77.LUAN Maotian.Ramberg-Osgood constitutive model with variable parameters for dynamic nonlinear analysis of soils[J].EarthquakeEngineering and Engineering Vibration.1992,(2):69-77.(in Chinese)
[7]Abdel-Ghaffar A M,Aik-Siong Koh.Earthquake induced longitudinal strains and stresses in non-homogeneous earth dams[J].Earthquake Engineering and Structural Dynamics,1981,9(6):521-542.
[2]Hardin B O,Drnevich V P.Shear modulus and damping in soils:design equations and curves[J].Journal of Soil Mechanics andFoundations Division,ASCE,1972,98(SM7):667-692.
[3]Hardin B O,Drnevich V P.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of Soil Mechanicsand Foundations Division,ASCE,1972,98(SM6):603-624.
[4]迟世春,刘怀林.土工建筑物动力真非线性分析的量化记忆模型[J].水利学报,2003,(10):51-59.CHI Shichun,LIU Huailin.Scale memory model for dynamic nonlinear analysis of earth structure[J].Journal of HydraulicEngineering.2003,(10):51-59.(in Chinese)
[5]俞培基,梁永霞,秦蔚琴.石灰岩人工砂的动剪横量和阻尼比[J].岩土工程学报,1988,10(4):57-63.YU Peiji,LIANG Yongxia,QIN Weiqin.Shear moduli and damping factors of artificial limestone sand[J].Chinese Journal ofGetechnical Engineering,1988,10(4):57-63.(in Chinese)
[6]栾茂田.土动力非线性分析中的变参数Ramberg-Osgood本构模型[J].地震工程与工程振动,1992,(2):69-77.LUAN Maotian.Ramberg-Osgood constitutive model with variable parameters for dynamic nonlinear analysis of soils[J].EarthquakeEngineering and Engineering Vibration.1992,(2):69-77.(in Chinese)
[7]Abdel-Ghaffar A M,Aik-Siong Koh.Earthquake induced longitudinal strains and stresses in non-homogeneous earth dams[J].Earthquake Engineering and Structural Dynamics,1981,9(6):521-542.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心