GDS空心圆柱扭剪试验系统阻尼的测定

The damping determination of the gds hollow cylindrical torsional shear test system

通过GDS空心圆柱扭剪试验系统的动态三轴试验得到水试样的动应力和动应变时程曲线,采用传统的等效线性模型计算其阻尼比λ_1。通过互相关函数法计算得到系统的阻尼比λ_2,最后将λ_1和λ_2进行比较。研究结果表明:阻尼比随动应力幅值的增大而增大,并呈一定的线性关系即λ=kσ_d,且k的取值范围为4×10^(-5)~7×10^(-5)。

Through the dynamic triaxial test of the GDS hollow cylindrical torsional shear test system,the dynamic stress and dynamic strain process curve of water sample was obtained first.The system damping ratioλ1was then calculated through the traditional equivalent linear model.The damping ratio of the systemλ2was calculated on the basis of the cross-correlation function method,andλ1andλ2were finally compared.The experimental result shows that the test damping ratio increases as the dynamic stress amplitude increases,and there is a certain linear relationship between them:λ=kσd and k is between4×10-5and7×10-5.