面向RC结构损伤演变的位移相关型阻尼模型及参数识别

发布时间：2018-01-16 07:16

本文关键词：面向RC结构损伤演变的位移相关型阻尼模型及参数识别　出处：《工程力学》2017年11期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Because the current damping model can not fully reflect the relationship between damping and damage of reinforced concrete structure, a displacement-dependent nonlinear damping model is proposed. The model can not only reflect the viscous damping energy dissipation in the structural vibration process, but also reflect the internal friction energy dissipation related to the structural damage. The internal friction damping is decomposed into residual stress effect and bond-slip effect. Based on the energy conservation principle, the internal friction damping is decomposed into the residual stress effect and the bond-slip effect. A method for identifying damping parameters in the model is presented. A reinforced concrete simply supported beam is subjected to damage loading and dynamic testing. The damping parameters of each damage state are identified based on the displacement-dependent nonlinear damping model and the related dynamic model. 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 peak value of displacement. It can also reflect the evolution of damping ratio with damage degree.
【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;中铁建设集团有限公司;
【基金】：国家自然科学基金项目(51378039,51421005,51478024,91315301-03)
【分类号】：TU375
【正文快照】： 建筑结构及桥梁等钢筋混凝土结构随着使用年限的增长将出现不同程度的损伤。对钢筋混凝土结构进行精准建模并对其损伤状态进行有效模拟和评估,是确保其安全性的重要手段。目前常用的损伤分析方法主要根据结构的频率和振型等动力特征与损伤程度的关系实现,相应关系和动力模型已

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