2021 : Monitoring the propagation of cracks on reinforced concrete using notch as a localized initial defect

Dimas Pustaka Dibiantara ST., M.Sc



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Collapse scheme of reinforced concrete element certainly can not be separated from the characteristics of the constituent material. In general, the pattern collapse started with the development and propagation of cracks that was already there when the casting process of these elements was finished. Some of the things that led to a crack before loading as hydration process that generate heat, lack of proper curing, shrinkage due to water loss. While at the time of loading, the development and initial crack propagation is caused by the deformation of the retaining elements gravity of these elements, thus affecting the compressive force resisting deformation element. This paper discusses and compares the collapse that occurred in reinforced concrete slab experimentally and numerically (250x100x1000), with and without the notch. Modeling plate carried by program CAST3M 13 in 2D, concrete elements are modeled as QUA4 elements and reinforcing steel elements as BARR (Concrete CEA). Comparison of experimentally showed un-notched plate has a Young's modulus value of 24 GPa with stiffness numbers 14 285 N / mm and a maximum deflection of 0.7mm, while the notched plate 19 GPa to 13 749 N / mm and 0.8mm. Comparison of numerically demonstrate the value of the elastic limit deflection plate was notched by 0.3mm and 4.3mm plastic limit, while the notched plate of 0.56mm and 4.4mm. This indicates that the impact of the presence of the notch serves to increase the deflection value at the beginning of loading, which means the specimen stiffness decreased significantly at the start of loading.