基于AE对预应力钢筋砼梁损伤试验分析

Experimental Analysis on Damage of Prestressed Reinforced Concrete Beam Based on AE

为了探究预应力钢筋混凝土梁损伤与其声发射信号之间的关系,利用声发射技术对预应力钢筋混凝土梁损伤过程进行监测。通过三点弯曲试验,采集到预应力钢筋混凝土梁损伤的实时声发射信号数据。分析不同荷载下声发射信号幅值与上升时间的参数分布图,并对比加载过程试件梁的裂缝变化,发现不同信号幅值分布与混凝土梁的损伤类型具有很好的相关性,可以演化试件梁的损伤过程,其中高幅值信号的集聚意味着宏观裂缝的出现。此外,通过ISA信号强度准则的计算,对预应力钢筋砼梁损伤程度做出了定性评价。

In order to explore the relationship between the damage of prestressed reinforced concrete beam and its acoustic emission signal,acoustic emission technology is used to monitor the damage process of prestressed reinforced concrete beam.Through the three-point bending test,the real-time acoustic emission signal data of the damage of the prestressed reinforced concrete beam was collected.By analyzing the parameter distribution of AE signal amplitude and rise time under different loads,and comparing the crack changes of specimen beam during loading process,it is found that the different signal amplitude distribution has a good correlation with the damage type of concrete beam,which can evolve the damage process of specimen beam,and the concentration of high amplitude signal means the appearance of macro cracks.In addition,the damage degree of prestressed reinforced concrete beams is evaluated qualitatively by the calculation of ISA signal strength criterion.