###### Abstract
They discovered that introducing 2% steel fiber increased compressive and flexural strengths by up of 65% and 79%, respectively, over the unreinforced counterpart mix (STF). Additionally, it was reported that the use of 100% RCA with 2% STF and 2% nano-clay (NC) results in a previous concrete suited for structural purposes. [PERSON] et al. [17] investigated the efficacy of composite fiber reinforced polymer (CFRP) layers for five exterior beam-column connections using a finite element model (FEM) based on previously collected experimental data. It was discovered that L-shaped FRP composite overlays at the beam-column interface were an appropriate method for increasing ductility. Additionally, U-shaped overlays beneath the beam and the use of FRP on both lateral sides of the beam were excellent reinforcing solutions for enhancing the RC joints' strength and ductility. Through the use of artificial neural networks (ANN) and extreme learning machines, scholars have evaluated the influence of fly ash and silica fume replacement content on the strength of concrete [18]. Various ratios of fly ash with (without) additional silica fume have been evaluated for this. The ratio of water to cement varies throughout the test. FA contributed less to the strength of concrete at younger ages, but significantly more at older ages. As a result, the increased effect of a small amount of SF on compressive strength was not statistically significant. In the short term, adding fly ash decreased compressive strength, but boosted it in the long run. Adding silica fume increases the strength in the short term but diminishes it over time. The behavior of angle shear connections was examined numerically by researchers [19]. Thermo-mechanical finite element modeling was done on push-out samples using the ABAQUS software, and the findings were compared to those obtained from laboratory tests. The research findings indicated that the numerically models were capable of effectively predicting laboratory results such as shear strength and slip. Additionally, data indicated that increasing the temperature to 850 \({}^{\circ}\)C results in a 56% reduction in the shear strength of the samples. [PERSON] et al. assessed the compressive strength of concrete combining furnace slag and fly ash in place of cement [20]. A database of 1030 data sets was used in the evaluation of the compressive strength of the modified concrete. The author(s) utilized a hybrid artificial neural network-genetic algorithm (ANN-GA) in the study. The ANN-GA model for concrete compressive strength prediction outperformed an ANN-BP model in terms of precision, the study's findings revealed. Furthermore, the hybrid ANN technique was adopted for theoretically predicted the cohesion between the sand-soil that combined with fibers [21]. A uniaxial compression test was used to characterize the behavior of 48 cylindrical specimens prepared from fiber-reinforced concrete with end-hooked steel fibers and analytical model was proposed [22]. The test revealed a ductile behavior of steel fibre-reinforced concrete specimens even exceeding its compressive strength. Additionally, it was demonstrated that the strain at compressive strength generally increased as the fiber volumetric ratio and aspect ratio increased, although the elastic modulus reduced. [PERSON] and [PERSON] studied the flexural response of steel fibrous concrete cross-sections with a randomly chosen geometry through a computational approach [23]. Moreover, a compressive stress-strain graphs and 257 strength values were used to construct a new compressive stress-strain model for steel fibrous concrete. The proposed sectional analysis was validated against experimental data for 42 SFC beams, and it accurately predicts the flexural capacity and curvature ductility of SFC members. The behavior of double-ended hook steel fiber concrete elements with 80 MPa compressive strength was also investigated considering specimens dimensions, shape, content, aspect ratio, and tensile strength of the embedded steel fiber [24].