混凝土梁破坏过程声发射特性试验研究

EXPERIMENTAL STUDY ON ACOUSTIC EMISSION CHARACTERISTICS OF CONCRETE BEAM FAILURE PROCESS

研究了混凝土三点弯曲梁破坏过程的声发射(AE)特性。结果表明,混凝土梁在三点弯曲受载过程中声发射试验较好的监测了混凝土梁断裂破坏的全过程;在三点弯曲状态下,混凝土梁声发射信号参数经历可以分为4个阶段:初始压密阶段、稳定扩展阶段、起裂阶段和断裂破坏阶段;得到了三点弯曲梁受载过程中声发射损伤定位随时间的变化经历图。

This article studies the concrete three-point bending beam failure process of acoustic emission（AE） characteristics. The results show that the concrete beam in the process of three point bending loading acoustic emission test better monitoring the whole process of the concrete beam fracture damage; In the three-point bending state, the parameters of the concrete beam acoustic emission signal can be divided into four stages： initial compaction stage, stable expansion stage, crack initiation and fracture failure stage. The change of acoustic emission damage localization with time is obtained.