The purpose of this study is to investigate the characteristics of fresh concrete and the mechanical properties of hardened concrete with incorporation of amorphous metallic fiber into high strength concrete. Based on the experimental results, the slump decreases as the content of amorphous metallic fiber concrete increases, and it can be ensured that the optimum workability is obtained when 0.3% of concrete volume fraction in mixing is mixed regardless of the length of the steel fiber. In addition, the incorporation of amorphous metallic fiber has a limitation on the enhancement of compressive strength regardless of steel fiber content ratio, but tensile strength and flexural strength increase up to 2 times depending on the increase of the content ratio and length of the steel fiber. The bond stress increased with the increase of the content rate of the steel fiber, but it is considered that the optimum content ratio of amorphous metallic fiber is 0.3 % of volume fraction with regard to the workability and mechanical properties.
As buildings are growing higher and larger, more composite structures have been used. However, the steel member used for composite structure tends to rapidly lose its strength at elevated temperatures. For this reason, it is required to apply a fire resistance mechanism, but it is difficult to implement because of the cost and technical limitations in the case of fire-resistant paint. In case of fireproof spray coat, scattering phenomena, poor work conditions for wet application, and construction delay are the main challenges to be addressed. In this study, a full-scale fire resistance test of non-fire resistant cladding column was conducted in accordance with KS F 2257-7. According to the test results, the specimens CC-01, CC-02, and CC-03 failed to meet the requirements for a 3-hour fire resistance rating because of the joint deformation and less cover thickness, while CC-04, CC-05, and CC-06 with increased thickness and reinforced joints satisfied the requirements for a 3-hour fire resistance rating.
In case of electrical cable fire, the chance of fire spreading through penetrations is increasing rapidly. The present study has been conducted to investigate the fire spreading of electrical cable types. The subjects of the experiment are electrical cables are general PVC cable, fire retardant paint PVC cable and fire retardant cable. As a result of experiments, general PVC cables were burnt down and risen to about 900 o C by the fire spreading. On the other hand, fire retardant paint PVC cables and fire retardant cables flame were controlled and risen to about 100 o C by self resistance to flame. To prevent fire spread through penetrations, fire retardant cables are suited. In case of general PVC cables are installed at aged buildings, It is necessary to use fire retardant paint for fire safety.
Advanced foreign countries have performed the fire resistance design of buildings by the alternative performance design methods, which are based on fire engineering theories. However, in the case of South Korea, the process on the alternative fire resistance performance design has only suggested without any applications for real steel structures. This study was performed to evaluate the fire resistance performance of a steel building using the fire resistance performance design program, which was developed in the former research. From this study, it was obtained that the fire resistance design was over designed for the steel building in South Korea.
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