الفهرس | Only 14 pages are availabe for public view |
Abstract Geo-grid is a material manufactured from polymers and classified as a geosynthetic material. Nowadays, using geo-grid in reinforced concrete members sets a new beginning in employing geosynthetic materials in structural engineering. This research work describes a comparative study of RC beams reinforced with uniaxial Geogrid and steel fibers in the presence of flexural reinforcement. Eleven experimentally tested reinforced concrete beams were chosen to verify this work. ANSYS program was used in the analysis of the beams. Concrete is modeled as a solid element (SOLID65), whereas Geogrid and steel fibers were modeled as volumetric ratios. Comparison between the analytical modeling and experimental results proved that the FEA software ANSYS can be used effectively to analyze RC beams in which Geogrid has been added as additional reinforcement. A parametric study was carried out using eighty-five reinforced concrete beams. The eighty-five beam specimens may be classified into fifteen groups. They were modeled using ANSYS Vr (15.0) nonlinear finite element program. The main studied parameters were the compressive strength, different values of Geogrid volumetric ratio (3, 4.5, 6, 7.5, and 9%), different volumes of steel fibers (0.5, 0.75, 1, 1.25, 1.5, 2, 2.5 %) and different Bottom Reinforcement Ratios (0.25, 0.5, 0.75, 1, 1.25, 1.5%). Addition of uniaxial Geogrids as a reinforcing technique proved to be an effective tool to improve the flexural behavior of beams and improve the cracking patterns. Increasing the Geogrid volumetric ratio in reinforced concrete beams plays a major role in ameliorating their flexural behavior; since it significantly increased the failure load of specimens even with low compressive strengths. For low percentages of bottom steel reinforcement, increasing the volumetric ratio of Georid had a significant effect on deflection since it decreased by 24.3%. Also, failure load increased by 17%. |