螺旋肋钢丝与混凝土粘结滑移的声发射检测
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摘要
声发射技术作为一种新型动态无损检测方法,可动态检测在役钢筋混凝土结构的粘结滑移性能。对螺旋肋钢丝与混凝土拔出试件进行拔出试验,利用声发射技术对其拔出过程中的声发射特征信号进行处理与分析,得出这两种材料粘结滑移的声发射特征;通过三维时差定位方法对拔出过程的声发射源进行定位,由定位结果可知,声发射源点主要分布在粘结滑移界面,证明与实际受力结果吻合;最后结合试验数据,建立了粘结破坏过程的受力状态与声发射能量参数间的对应关系。
Acoustic emission technique(AET),as a new type of dynamic non-destructive testing method,can detect the bond-slip abilities of the existing reinforced concrete structure dynamically. Pull-out test was carried out with the specimen composed of helical rib wire and concrete. AE characteristic signals of the course of pull-out was processed and analysed by AET for purpose of gaining the AE characteristic of bond-slip. The AE source was located by using the 3D TDOA location method. The results showed that the AE sources were mainly located in the interface,which were in line with the actual results of stress;Finally,the relationship between the load case during the bond failure and the energy parameter of AE was established.
Acoustic emission technique(AET),as a new type of dynamic non-destructive testing method,can detect the bond-slip abilities of the existing reinforced concrete structure dynamically. Pull-out test was carried out with the specimen composed of helical rib wire and concrete. AE characteristic signals of the course of pull-out was processed and analysed by AET for purpose of gaining the AE characteristic of bond-slip. The AE source was located by using the 3D TDOA location method. The results showed that the AE sources were mainly located in the interface,which were in line with the actual results of stress;Finally,the relationship between the load case during the bond failure and the energy parameter of AE was established.
引文
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[3]Grosse U,et al.Signal-based acoustic emission tech-niques in civil engineering[J].Journal of the materials in civil engineering,ASCE,2003,15(3):274-279.
[4]刘培洵,刘力强,等.实验室声发射三维定位软件[J].地震地质,2007,29(3):674-679.
[5]Grosse C,et al.Localization and classification of frac-ture types in concrete with quantitative acoustic emis-sion measurement techniques[J].NDT&E Interna-tional,1997,30(4):223-230.
[6]徐有邻,等.螺旋肋钢丝粘结锚固性能的试验研究[J].混凝土与水泥制品,1998,4(4):34-38.
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