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针对目前阻尼模型不能充分反映钢筋混凝土结构阻尼与损伤之间关系的不足,提出位移相关型非线性阻尼模型,该模型既能反映结构振动过程中的粘滞阻尼耗能又能反映与结构损伤相关的内摩擦耗能。将内摩擦阻尼分解为残余应力效应和粘结滑移效应。基于能量守恒原理提出模型中阻尼参数的识别方法,并进行数值验证。对一钢筋混凝土简支梁进行损伤加载和动力测试,基于位移相关型非线性阻尼模型和相关动力学模型识别各损伤状态下的阻尼参数,分析其变化规律及非线性阻尼与损伤之间的内在联系。结果表明位移相关型阻尼模型不仅能反映阻尼比随位移峰值的增大而增大的现象,还能反映阻尼比随损伤程度的演变规律。
Aiming at the shortcomings that the damping model can not fully reflect the relationship between the damping and the damage of the reinforced concrete structure, a displacement-dependent nonlinear damping model is proposed. The model not only reflects the viscous damping energy dissipation during the vibration but also relates the structural damage Internal friction energy consumption. The internal friction damping is decomposed into residual stress effect and bond slip effect. Based on the principle of energy conservation, the identification method of damping parameters in the model is proposed and verified by numerical method. The damage load and dynamic test of a simply supported reinforced concrete beam are carried out. Based on the displacement-dependent nonlinear damping model and the related dynamic model, the damping parameters of each damaged condition are identified, and the variation regularity and the inner between nonlinear damping and damage contact. The results show that the displacement-dependent damping model can not only reflect the phenomenon that the damping ratio increases with the increase of the displacement peak, but also reflect the evolution law of damping ratio with the degree of damage.