钢筋混凝土构件固有频率测试及损伤分析

Natural frequency test and damage analysis for reinforced concrete components

结构固有频率的变化在结构损伤的确定和识别过程中起着重要的作用。本文设计两类RC构件,对其进行低周疲劳荷载模态试验,通过振动测试分析系统实测了RC构件损伤前后的固有频率;随后,基于结构损伤程度与结构固有频率的定量关系,对试验的钢筋混凝土构件进行了损伤量化分析。结果表明:在低周疲劳荷载作用下,若已知钢筋混凝土构件的初始固有频率,通过测试构件损伤后的固有频率,可以定量求出结构的损伤程度。研究结果可为结构损伤定量分析提供参考与借鉴。

The variation of natural frequency of the structure plays an important role in the determination and recognition of structural damage. Two kinds of RC components are designed to conduct modal test on low-cycle fatigue load. The natural frequencies of RC components before and after damage are measured by vibration test and analysis system. After that,based on the quantitative relationship between the damage degree and the natural frequency of the structure,the damage quantitative analysis of the testing reinforced concrete components is carried out. The results show that,under the effect of low cycle fatigue load,if the initial natural frequency of reinforced concrete components is known,then the damage degree of the structure can be calculated quantitatively by testing the natural frequency after the damage of the components. The conclusion of this research can provide references for the quantitative analysis of structural damage.