基于声发射的钢筋混凝土梁承载能力评估

Carrying capacity assessment of reinforced concrete beam based on acoustic emission

在钢筋混凝土断裂过程中能量平衡基础上,结合声发射与断裂力学参数的耦合关系,得到裂纹稳定拓展过程中,声发射振铃数与钢筋混凝土梁抗弯刚度间的关系,并通过钢筋混凝土梁静、动态弯曲破坏试验进行验证。结果表明:在能量平衡原理基础上建立声发射参数与钢筋混凝土梁承载能力的关系是可行的。在宏观裂纹稳定拓展阶段,通过声发射传感器实时监测获得破坏过程的声发射信号,能准确评估钢筋混凝土梁的抗弯刚度。

Based on the energy balance during the process of concrete fracture and the relationship between the acoustic emission and fracture mechanics, parameters the correspondence between the acoustic emission and the flexural rigidity of reinforced concrete beam at the stage of crack development was derived. The bending destructive experiments of a reinforced concrete beam subjected to dynamic and static load were conducted to verify the proposed equation. The results show that it is feasible to establish the relation between the acoustic emission parameters and the surplus carrying capacity based on the theory of energy balance. At the stage of crack development, the flexural rigidity of reinforced concrete beam can be exactly calculated by acoustic emission parameters acquired from the acoustic emission transducers.