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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Structural Damage Detection in Reinforced Concrete Beams Using Modal Damping Measurements
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Structural Damage Detection in Reinforced Concrete Beams Using Modal Damping Measurements

机译：基于模态阻尼测量的钢筋混凝土梁结构损伤检测

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摘要

Damage detection by evaluation of dynamic system characteristics has received considerable attention in recent years. The development of new powerful systems in data acquisition and signal processing allows to determine accurately the dynamic system characteristics. It is noted that eigenfrequencies and mode shapes are the most commonly used dynamic parameters for the description of the structural behavior and damage evaluation in structures. Damping properties are less used in this framework because of difficulties in performing accurate damping measurements and because of the complexity of the damping phenomena in reinforced concrete structures. The present paper applies the energy balance approach on cracked reinforced concrete beam, in order to understand the evolution of material damping with crack damage. An approach based on finite element modeling is proposed. In the model, two degradation processes in the reinforcement concrete material are considered: the decrease of rigidity in the section where the crack damage occurs and the friction effect due to relative motion of the crack edges. It appears that the two processes lead to opposite damping evolution; the decrease of the rigidity in the concrete matrix results apparently in the decrease of the total damping of the reinforced concrete beam while the friction effect has as tendency to increase the total damping.
机译：近年来，通过评估动态系统特性来进行损伤检测已引起了广泛的关注。数据采集​​和信号处理中新的强大系统的开发允许准确确定动态系统特性。注意，本征频率和振型是描述结构行为和结构损伤评估最常用的动态参数。由于难以进行精确的阻尼测量，并且由于钢筋混凝土结构中阻尼现象的复杂性，因此在该框架中较少使用阻尼特性。本文将能量平衡方法应用于开裂的钢筋混凝土梁上，以了解具有裂纹损伤的材料阻尼的演变。提出了一种基于有限元建模的方法。在该模型中，考虑了钢筋混凝土材料中的两个降解过程：出现裂纹破坏的区域的刚度降低以及由于裂纹边缘的相对运动而产生的摩擦效应。看来这两个过程导致相反的阻尼演化。混凝土基体刚度的降低显然导致钢筋混凝土梁的总阻尼的降低，而摩擦效果具有增加总阻尼的趋势。

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