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Title |
Estimation of Strength for Flexural Members in Reinforced Concrete after High Temperature
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Keywords |
철근콘크리트 보 부재; 휨 강도; 철근비; 가열조건; reinforced concrete flexural members; flexural strength; reinforcement ratios; heating condition |
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Abstract |
The purpose of this study is to investigate the flexural strength for reinforced concrete beam members after high temperature. In order to investigate the strength of flexural members, we tested twelve reinforced concrete beam members with three reinforcement ratios (ρmax, 0.5ρmax, ρmin) and four heating conditions (non-heating, 400℃-2hr/4hr and 800℃-4 hr). The experimental results show that failure mode, load-displacement relationship, initial stiffness, moment-curvature relationship and moment-strain relationship are affected on reinforcement ratios and heating conditions. And we analyzed reinforced concrete beam members varying heating conditions with proposed sectional analytical method. The results of this study can be summarized as follows; (1) The specimens showed various failure modes following to the reinforcement ratios and heating conditions. At the same heating conditions, the higher reinforcement ratio, the lower the resistance load and initial stiffness of beam members. And the higher temperature, the higher strain at the same moment. (2) The values which are compared with the nominal strength and the experimental maximum load are 0.85~l.05 at 400℃ and 0.44~0.64 at 800℃. (3) After comparing analytical value with experimental result about maximum moment of members, its average (experimental value / analytical value) shows 0.95 and we proved trustability about proposed analytical method. (4) We proposed flexural strength equation of various heating conditions for reinforced concrete beam members.
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