A total of 13 ferroconcrete slab specimens reinforced by composite mortar were used to conduct a strength performance evaluation with the types of reinforcement and the diameter of wire meshes as its parameters to determine failure modes, ductility and stiffness. A total of six floor impact noise tests based on KS F 2810-2:2012 were performed at the construction site of H apartment complex, which had just completed frame construction. The study used Ethylene-Vinyl Acetate Copolymer (EVA), Expanded Polystyrene (EPS), and Polypropylene (PP) as the reinforcement materials effective against floor impact noise, and employed the gridshaped steel wire meshes for improving strength performance.The test results showed that in the case of the reinforced slab specimens, there was no detachment of reinforcement materials like the wire meshes and composite mortar thanks to the bonding force of anchor bolts and composite mortar. Under the maximum strength, the EVA-reinforced slab specimen was the most effective by improving the heavyweight floor impact noise by 23% and the lightweight floor impact noise by 12%.
The aims of this study are, first, to determine the confining effect of concrete specimens reinforced with carbon fiber (CF) or glass fiber (GF), and second, to compare the confining effect of PET fiberreinforced concrete specimens with the above, CF-or GF-reinforced specimens so as to ultimately determine whether PET fiber can play a role as a reinforcement. Toward this end, the study produced circular specimens of 100 mm in diameter and 300 mm in height and conducted a test after reinforcing these specimens with CF, GF, or PET fiber, for which the types of the reinforcement, the number of reinforcement layers, and concrete strength were the key parameters. The test results showed there was little improvement of strength with the specimens reinforced with PET sheets when compared to those with CF or GF; however, the ductility had greatly improved while maintaining the strength so that the test completed as the PET fiber-reinforced specimens did not reach compressive fracture and PET fiber consistently supported lateral confinement. As a result, it showed that reinforcement with PET fiber would prevent the worst case of structures collapsing complete; therefore, that PET fiber would be used in construction projects.
Recently there has been an increase in people's interest in friendly-environment woodenstructure buildings due to changes in the diversified housing environment. Resulting from such increased interest . there is also growth in the amount of consumed and imported woods required for various designs of wooden buildings. However, due to lack of experience in designing such buildings, many problems have arisen, including excessive dependence on traditional wooden architectures. This study conssiders the construction method of inserting a CFRP Bar into the wooden surface. From a comparison of maximum internal force, the experimental specimen group reinforcing the lateral side and the bottom side of wood showed an increased maximum internal force over 50% more than the non-reinforced specimen group, so it is known that if the load reduction rate, ΔP max is increased, the transformation rate of CFRP Bar is increased. From this result, it is also known that the CFRP Bar properly distributes the external force being exercised from outside, and this proposed construction method is effective.
As a part of development of an emergency retrofit method with stressed external hoops for seismic damaged RC columns, a cantilever type monotonic loading test was carried out to exhibit bond splitting strength of main bar after emergency retrofit. Based on the test results, an equation to express bond splitting strength was derived with a damage index, which is bond slip displacement at the end of damage introduction loading.The equation gave an approximate prediction if the damage index was evaluated indirectly with area of bond splitting cracks or maximum width of those cracks that can be obtained more easily.
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