Behavior of Adhesive Anchors Reinforced with Postinstalled Steel Bars under Monotonic and Cyclic Loading
https://orcid.org/0000-0003-4164-0357
Diego-Alberto Espitia-Rojas
https://orcid.org/0009-0009-0930-4346
Yezid A. Alvarado
https://orcid.org/0000-0002-1260-8211
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Abstract
One alternative to increase the capacity of an anchorage is the use of post-installed rebar with epoxy adhesive. This research analyzed anchor reinforcement alternatives for an installation case where the post-installed rebar had the same embedment depth as the original anchor. Monotonic tensile tests were performed to determine the percentage of load in-crease and to identify the best alternative through an efficiency analysis (additional load capacity/direct cost). In addition, cyclic tensile tests were performed to determine the load performance when the anchor was subjected to load and unload cycles. The best reinforcement alternative increased the load capacity of the anchor by 25%. It was also shown how loading and unloading cycles affect the distribution of forces in the steel bars of the anchorage system.
Resumen:
Una alternativa para aumentar la capacidad de un anclaje es el uso de barras de refuerzo postinstaladas con adhesivo epoxi. En esta investigación se analizaron alternativas de refuerzo de anclajes para un caso de instalación en el que la barra de refuerzo postinstalada tenía la misma profundidad de embebido que el anclaje original. Se realizaron ensayos de tracción monotónica para determinar el porcentaje de aumento de carga e identificar la mejor alternativa mediante un análisis de eficiencia (capacidad de carga adicional/coste directo). Además, se realizaron ensayos de tracción cíclica para determinar el comportamiento de la carga cuando el anclaje se sometía a ciclos de carga y descarga. La mejor alternativa de refuerzo aumentó la capacidad de carga del anclaje en un 25%. También se demostró cómo afectan los ciclos de carga y descarga a la distribución de fuerzas en las barras de acero del sistema de anclaje.
Adhesive anchors, anchor reinforcement, monotonic loading, post-installed rebar, cyclic loading
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