Impact behavior of low strength concrete slab strengthened with fan type anchored carbon fiber‐reinforced polymer strips

Abstract

This study investigated the behavior of slabs produced with low compressive strength concrete without reinforcements under the effect of sudden dynamic impact loading. In addition, an experimental study was conducted by proposing a strengthening method with anchored carbon fiber‐reinforced polymer (CFRP) strips to strengthen the nonreinforced slabs with low‐strength concrete against sudden dynamic impact loads to improve their performance. The variables examined in the experimental study were the placement of the CFRP strips adhered to the concrete slabs for strengthening purposes and anchors in the strips. A constant energy level of impact loading was applied to the concrete slab test specimens with the authors' free weight drop test setup. The acceleration‐time, displacement‐time, strain‐time, and applied impact loading‐time measurements on the concrete slabs were examined, and comments were made about the strengthening method applied to the slab test specimens. In addition, numerical analysis of the tested concrete slabs with ABAQUS finite element software was performed, and the results were compared with the experimental results. In the comparison, it was investigated to what extent numerical analysis and this type of impact analysis can be done realistically and compatible with the experimental results. Within the scope of the study, the strengthening method applied with fan‐type anchored CFRP strips significantly improved and increased the impact performance of concrete slabs produced with low‐strength concrete.

Anti-Impact Performance Enhancement of Two-Way Spanning Slab through the Implementation of Steel Trussed Bars

“…Concrete structures, especially those fortifed with reinforcements, confront both localized and extensive deterioration in the face of such exigencies, their manifestation infuenced by a confuence of variables such as the magnitude of the force exerted and the inherent vibrational properties of the structure [2]. Pioneering experiments conducted on concrete elements, encompassing beams [3][4][5][6][7][8][9][10][11][12], columns [12][13][14], bridge piers [15], and slabs [16] have provided the foundational framework for comprehending the manner in which structures react to unanticipated and formidable forces [17]. Emphasizing the mechanisms of failure and resistance inherent to these components, historical studies have often adopted scaled-down replicas for pragmatic purposes, thereby facilitating practical insights into the behavior of concrete structures under duress.…”

Comparison of 2D and 3D meso‐model of concrete under high strain loading rate

“…However, some researchers have omitted the interfacial transmission zone (ITZ) because of its very small size and difficulty in numerical modeling and simulation. [1][2][3][4][5][6][7] The micro model of concrete further subdivides the hardened cement paste into fine aggregate and hardened cement paste.…”

“…The macro model considers the concrete as a homogenous material and does not differentiate between the various phases present in the concrete (i.e., aggregate, mortar, and interfacial transition zone), whereas the meso‐model considers these aforementioned phases. However, some researchers have omitted the interfacial transmission zone (ITZ) because of its very small size and difficulty in numerical modeling and simulation 1–7 . The micro model of concrete further subdivides the hardened cement paste into fine aggregate and hardened cement paste.…”