Ultrahigh performance concrete (UHPC) is one of the recent advancements in construction building materials and popularly used as a precast applications or strengthening material. The current paper attempts to improve understanding about fracture and failure mechanisms of UHPC application as a strengthening material using acoustic emission (AE) technique. The paper proposes an integrated and nonintegrated approach to relate the mechanical energy with AE energy for (i) undamaged reinforced concrete (RC) beams and (ii) damaged RC beams strengthened with UHPC. The integrated approach evaluates the damage mechanisms by evaluating sentry function (logarithmic ratio of mechanical and acoustic energy), while nonintegrated approach considers superimposition of flexure and AE response, load versus AE energy behavior and damage index. To validate the proposed approach, experiments are conducted on (i) control RC beams and (ii) RC beams strengthened with UHPC layers of t, 1.5t, and 2t thickness (where t = 10 mm). From the study, it is found that analysis of structures using both the approaches can overcome corresponding limitations. Hence, to completely characterize the damage, both methods are recommended.

中文翻译：

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使用集成和非集成声发射方法对超高性能混凝土增强梁进行智能监控

超高性能混凝土（UHPC）是建筑建材的最新进展之一，广泛用作预制件或增强材料。本文试图通过声发射（AE）技术来增强对UHPC作为增强材料的破裂和破坏机理的理解。本文提出了一种综合和非综合的方法，将（i）完好无损的钢筋混凝土（RC）梁和（ii）用UHPC加固的受损RC梁的机械能与AE能量联系起来。集成方法通过评估哨兵功能（机械能和声能的对数比）来评估损伤机制，而非集成方法则考虑挠曲和AE响应，载荷与AE能量行为以及损伤指数的叠加。t  = 10毫米）。从研究中发现，使用这两种方法对结构进行分析可以克服相应的局限性。因此，为了完全表征损坏，建议使用两种方法。