| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 106 === According to ACI, any reinforcing bar with a yield strength greater than 420 MPa is defined as high-strength reinforcing bar, and concrete with a compressive strength of greater than or equal to 55 MPa for 28 days is defined as high-strength concrete. With the development of building materials and environmental needs, engineers gradually increased the strength of materials. The combination of high-strength concrete and high-strength reinforcing bar is “ New RC “. Nowadays, high-rise buildings have gradually become a new trend in metropolitan areas. In light of the fact that column members placed below high-rise constructions bear relatively high vertical loads, the application of New RC with its high strength as well as the design without expanding cross-section of column members not only reduce material usage and costs but also increase interior space in a building. But if high-strength concrete is heated rapidly, it is prone to burst, causes the protective layer to peel off and rebar to expose, even seriously affect the structural safety. Fortunately, adding some polypropylene fibers (PP Fibers) into concrete can reduce the chance of concrete bursting at high temperatures. In order to improve the fire resistance of the material. This thesis want to discuss the mechanical properties of the localized polypropylene high-strength concrete at elevated temperature, including compressive strength, modulus of elasticity and peak strain, and establish compressive stress-strain relationships of the localized polypropylene high-strength concrete at elevated temperature. Also, we want to establish the mechanical relationship of the high-strength reinforcing bar at elevated temperature either.
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