钢筋及其锈蚀对混凝土构件阻尼的影响

发布时间：2018-04-10 22:42

本文选题：钢筋 + 锈蚀　；参考：《工程力学》2017年03期

【摘要】：钢筋及其锈蚀将显著影响混凝土构件的动力特征参数。以纵筋配筋率、纵筋表面形式、箍筋间距、钢筋锈蚀率为主要参数,采用简支梁三点弯曲动态阻尼测试,研究各因素对弯曲小变形混凝土梁弹性阶段损耗因子与耗散模量的影响,探讨其作用机理,并对比分析构件刚度退化、阻尼演变随钢筋锈蚀率的变化规律。结果表明:损耗因子与耗散模量随配筋率增加先增加后减小,在配筋率为1%时达到峰值;损耗因子与耗散模量随钢筋锈蚀率增加先减小后增大,在锈蚀率为0.4%时达到最小值;损耗因子与耗散模量随箍筋间距的增大而减小;损耗因子与耗散模量按纵筋表面形式从大到小依次为月牙肋、光圆、方钢。随钢筋锈蚀率增加,阻尼比增长比刚度退化更显著,用阻尼参数探测钢筋混凝土构件的锈蚀损伤具有可行性。
[Abstract]:Steel bar and its corrosion will significantly affect the dynamic characteristic parameters of concrete members.Taking longitudinal reinforcement ratio, longitudinal reinforcement surface form, stirrups spacing and steel corrosion rate as the main parameters, the three-point bending dynamic damping test of simply supported beam is adopted.The effects of various factors on the loss factor and dissipative modulus in the elastic stage of flexural small deformation concrete beams are studied. The mechanism of the loss factor and the dissipative modulus are discussed, and the variation law of stiffness degradation and damping evolution with the corrosion rate of steel bars is analyzed.The results show that the loss factor and dissipation modulus increase first and then decrease with the increase of reinforcement ratio, and reach the peak value when the reinforcement ratio is 1%, the loss factor and dissipation modulus decrease first and then increase with the increase of steel corrosion rate, and reach the minimum value when the corrosion rate is 0.4.The loss factor and dissipation modulus decrease with the increase of stirrups spacing, and the loss factors and dissipative modulus are crescent rib, light circle and square steel in order from large to small in the form of longitudinal reinforcement surface.With the increase of corrosion rate of steel bar, the increase of damping ratio is more significant than the degradation of stiffness. It is feasible to detect corrosion damage of reinforced concrete members by damping parameters.
【作者单位】：绍兴文理学院建筑工程系;哈尔滨工业大学深圳研究生院;同济大学建筑工程系;深圳花样年地产集团有限公司;
【基金】：国家自然科学基金项目(51422804,51308340,51308322,51178340,41272345) 浙江省自然科学基金项目(Y1110184)
【分类号】：TU375

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