新素材の耐火性能に関する研究
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概要
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In order to use a FRP (Fiber Reinforced Plastic) rod instead ofa steel rod, the heat resistant evaluation is required. However, conventional FRP runs short of heat resistance. Therefore, FRP rods have been developed by using high heat resistant resin. The, heat-resistant resin is of two kinds; CP resin and phenol resin. The heat resistance of FRP was evaluated by the pull out test and bending test, test results showed that new FRP rods maintain equal to or more than 50% of bond strength at the temperature of Celsius. The bond stress of new FRP rod under high temperature showed around 40% improvement as compared with conventional one. The results from the bending test showed that the reduction of ultimate strength under the temperature of 200 degree Celsius declined by 66%, 41% and 28% in the specimens with epoxy resin, CP resin and phenol resin respectively. However, the ultimate strength at the normal temperature became lower than the design shear strength for the specimens with CP resin and the phenol resin. The bond property of AFRP was mainly influenced by the cut of the resin. The resin degrades with the increase in temperature and the bond resistance declines by using heatresistant resin, the bond property in the hot condition gets improved from the conventional FRP. With the increase in bond property, the strength reduction of the specimens reinforced with FRP rods compared with ordinary specimen was found to decrease. As for the normal temperature ultimate strength of specimens with CP resin and phenol resin reduced due to the decline of the Dowell action caused by the lack offlexural rigidity of FRP rods.
- 埼玉大学地域共同研究センターの論文
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