This study focuses on the relationship between the internal viscous damping and the stiffness of concrete material and structure having small deformation amplitude. New damping parameters were proposed to describe the energy dissipation capacity and the vibration–amplitude attenuation rate. An improved damping suspension test method for predicting the essential material parameters, elasticity modulus and loss modulus, was developed and validated. The results show that the viscous damping energy dissipation capacity of concrete material and structure having small deformation amplitude is proportional to the product of the loss factor and the stiffness, and the vibration-amplitude attenuation rate is proportional to the product of the damping ratio and the natural frequency. The variation in dimensionless damping mainly results from the change in the stiffness of concrete material and structure. The porosity shows the smallest elasticity modulus and the largest energy dissipation capacity of nano-phase in cement paste under constant loading conditions. The improved damping suspension test method is proposed based on theoretical analysis and is validated using an experiment and finite element analysis.

中文翻译：

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混凝土材料和结构内部粘性阻尼与刚度的关系

本研究重点研究了内部粘性阻尼与变形幅度小的混凝土材料和结构刚度之间的关系。提出了新的阻尼参数来描述能量耗散能力和振动幅度衰减率。开发并验证了一种改进的阻尼悬架测试方法，用于预测基本材料参数、弹性模量和损耗模量。结果表明，小变形幅值混凝土材料和结构的粘滞阻尼耗能能力与损耗因子与刚度的乘积成正比，振动幅值衰减率与阻尼比与刚度的乘积成正比。固有频率。无量纲阻尼的变化主要源于混凝土材料和结构刚度的变化。孔隙率表明水泥浆体中纳米相在恒载条件下弹性模量最小，耗能能力最大。在理论分析的基础上提出了改进的阻尼悬架试验方法，并通过实验和有限元分析进行了验证。