Kajian Perilaku Struktural pada Balok Beton Bertulang yang Diperkuat dengan Lapisan UHPFRC

Abstract

The use of concrete as a building material is very common nowadays. Damage to reinforced concrete structures is unavoidable. Therefore, the strengthening of reinforced concrete structures whose quality has decreased is a major problem. The damage that occurred was due to the earthquake that occurred. Indonesia is located in an earthquake-prone area, which makes structural reinforcement technology very important in the Indonesian construction world. The development of new reinforcement methods and designs and environmentally friendly materials is very important to extending the life of reinforced concrete structures. UHPFRC is one type of construction material that continues to grow. However, this material has not been used in the construction of structures because it still requires a new design concept and effective application. The use of UHPFRC and wire mesh is a new approach and its performance is still not promising. In this study, fifteen specimens of reinforced concrete beams reinforced with UHPFRC layers were prepared. One reinforced concrete beam was determined as the control beam, and the other reinforced concrete beam was tested with a load of 50% of the ultimate load capacity of the control beam. Then, reinforced concrete beams that are already in damaged condition are reinforced using variations of the Strip-Shape and U-Shape. One reinforced concrete beam from each variation of reinforcement is coated with UHPC with wire mesh. The deflection results of reinforced concrete beam testing were validated by numerical calculation modelling using the Ansys program. The test results show that the control beam and all the reinforced concrete beams fail in the flexural mode. Reinforced concrete beams with Strip-Shape variations provide an increase in the maximum load capacity of 14.45 % to 43.48 %, while for the UShape variation it is 46.09 % to 149.37 %. Reinforced concrete beams reinforced with UHPFRC layers, both Strip-Shape and U-Shape variations, and wire mesh variations resulted in ductility factors greater than 4 and 3. These values indicate that both UHPFRC and UHPC layers with wire mesh are feasible as materials. reinforcement of reinforced concrete beams located in the seismic area. Judging from the overall results obtained, the reinforcement carried out reached the optimum value on the Strip-Shape layer with a thickness of 20 mm and on the UShape layer with a thickness of 10 mm. The deflection values generated in laboratory testing are also well described in the Ansys program with a difference of 1.44 % on the control beam; 1.19 % on SS- and 0.33 % on US-1.