Browsing by Author "Najah, Azdeen Saleh"
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Item EXPERIMENTAL AND ANALYTICAL INVESTIGATION ON IMPACT BEHAVIOR OF CONVENTIONAL AND STEEL FIBER REINFORCED CONCRETE BEAMS(2022-02-22) Najah, Azdeen Saleh; Mertol, Halit Cenan; Tuncay, KağanThis research investigated the experimental and analytical behavior of unreinforced and reinforced concrete beams cast using conventional concrete (CC) and steel fiber reinforced concrete (SFRC) under impact loading. Dramix ZP-305 type steel fibers were used for SFRC. Half of the beam specimens were unreinforced and the others were reinforced using one 8 mm diameter steel reinforcement fixed at center of specimen cross section. Cylinder concrete compressive strengths used in this study were 12 and 26 MPa for CC specimens and 35 MPa for SFRC specimens. Beam specimens had 60×60×500, 100×100×500, and 150×150×500 mm dimensions. The specimens were tested under impact loading using a drop-hammer testing apparatus having a weight of 58.5 N. This weight was dropped from various heights (1.20, 2.00, and 2.95 m for unreinforced specimens and 2.95, 3.00, and 3.04 m for reinforced specimens) based on specimen sizes. The slow motion videos of the tested specimens were recorded using a high-speed camera having a frame rate of 2000 fps. Experimental velocity-time relationships for hammer were obtained by analyzing of recorded impact videos using the TEMA Motion Analysis Software. Beams, hammer, and supports were modeled in ANSYS Finite Element Analysis Program and parameters related to modeling were calibrated based on the test results. Riedel, Hiermaier, and Thoma (RHT) Concrete Model was used in ANSYS Dynamic Explicit AUTODYN solver. The results were compared to the experimental studies on CC and SFRC in this research and input parameters of the model were modified. Comparisons of the experimental and modeling results indicated that velocity-time relationships of hammer showed very good agreement for various concrete compressive strengths and dimensions of specimens. It can be concluded that the calibrated concrete model presented in this study could provide some general guidelines for predicting the behavior of reinforced and unreinforced CC and SFRC under impact loading.