In this study, the fresh properties, fracture energy, compressive strength, and flexural strength of self-compacting concrete including glass or basalt fibers were examined, and the effect of fibers on these properties were studied comparatively. For this purpose, fibers having three different lengths (6, 12, and 24 mm) were used in two different contents (2 and $4\mathrm{kg}/{\mathrm{m}}^3$ ). The workability of concrete mixtures decreased with fiber addition. The negative effect of basalt fibers on workability was greater than that of the glass fibers. The reduction in flow diameter was up to 40% and 44% as well as the reduction in L-box ratio was up to 41% and 48% in glass and basalt fiber mixtures, respectively. While the fiber addition generally reduced the compressive strength, it increased the flexural strength and fracture energy significantly. Increase in flexural strength was up to 58.6% in glass fiber and 43.5% in basalt fiber mixtures. The fracture energies of glass and basalt fiber mixtures were up to 55.1% and 30.4% higher than that of the control mixture, respectively.

Steel fiber reinforced concrete, compared to the conventional concrete; is a composite building material that performs much better in terms of parameters such as ductility, energy absorption capacity, fracture toughness, fatigue resistance, and the use of steel fiber reinforced concrete (SFRC) in structures has become widespread. In this study, a nonlinear finite element model (FEM) has been developed that can represent the behavior of beams produced by using steel fiber concrete subjected to impact load. For this purpose, a finite element model of beam series produced with fiber-reinforced concrete obtained from the literature was created. The ABAQUS package program was used to create models simulating the behavior. Numerical results showed that the model could successfully capture the experimental results of beams selected from the literature. In addition to simulation, a parametric study was also performed to investigate the effect of stirrups, reinforcement ratio, and drop height on the behavior of SFRC beams under impact loads. The results of the parametric study showed that increasing the fiber ratio and reinforcement ratio positively affected the behavior of SFRC beams in terms of displacement recovery.Steel fiber reinforced concrete, compared to the conventional concrete; is a composite building material that performs much better in terms of parameters such as ductility, energy absorption capacity, fracture toughness, fatigue resistance, and the use of steel fiber reinforced concrete (SFRC) in structures has become widespread. In this study, a nonlinear finite element model (FEM) has been developed that can represent the behavior of beams produced by using steel fiber concrete subjected to impact load. For this purpose, a finite element model of beam series produced with fiber-reinforced concrete obtained from the literature was created. The ABAQUS package program was used to create models simulating the behavior. Numerical results showed that the model could successfully capture the experimental results of beams selected from the literature. In addition to simulation, a parametric study was also performed to investigate the effect of stirrups, reinforcement ratio, and drop height on the behavior of SFRC beams under impact loads. The results of the parametric study showed that increasing the fiber ratio and reinforcement ratio positively affected the behavior of SFRC beams in terms of displacement recovery.

Our country is located in an active seismic zone and has therefore been subjected to large-scale earthquakes with a long historical record. Significant past earthquakes have resulted in fatalities and structural damage. For instance, events such as the 1939 Erzincan Earthquake, the 1943 Samsun Earthquake, and the 1999 Kocaeli Earthquake have deeply affected the country. However, the two earthquakes on February 6, 2023, have been recorded as the largest earthquakes in the last century. These earthquakes occurred on the East Anatolian Fault and directly affected 11 cities. In terms of loss of life and property, they caused three times more damage than the 1999 Marmara Earthquake. Reinforced concrete structures in our country are constructed according to specific standards. The construction criteria for buildings in seismic zones are determined by regulations. The regulation that came into effect in 2018 includes classifications based on earthquake levels. These classifications range from Earthquake Soil Motion Level-1 (DD-1) to Earthquake Soil Motion Level-4 (DD-4). In the design of reinforced concrete structures, the DD-2 Soil motion, which has a 10% probability of occurrence in 50 years, is considered as the minimum criterion. However, in this study, a reinforced concrete structure to be built in the Sakarya province will be modeled according to both DD-1 and DD-2 levels. The differences between these two approaches will be examined, and the losses and additional costs that would arise if DD-1 is considered in the design will be evaluated. The results will be analyzed and interpreted comprehensively. This study aims to shed light on the decision-making process in the design of structures in earthquake-prone regions.