| Title |
A Study on the Flexural Strength with Thermal Stress of the Reinforced Concrete Members for the High Temperature |
| Authors |
Han Sang-Hoon ; Lee Sang-Ho |
| Keywords |
Reinforced Concrete Beam Members ; Fire Conditions ; Thermal Stress ; Reinforcement Ratio ; M-φ Relationship |
| Abstract |
This study is to get the proper evaluation of the flexural strength of reinforced concrete members exposed to fire. An analytical method is presented for the moment-curvature relationship to the cross section. This method use heat-transfer analysis for the cross section as well as the stress- strain models and thermal properties of normal strength concrete and reinforcing steel with high temperature. 1)The stress-strain relationships of concrete and reinforcement, which is considered with initial thermal stress of cross section and heat transfer analysis are estimated. Comparing analytical value with experimental result, its average shows 0.96??2)The specimens showed various failure modes following to the reinforcement ratios and heating conditions. The values which are compared with the nominal strength and experimental result are 0.75～0.95 at 700℃. 3)The results of analysis with parameters are that the flexural strength exposing at high temperature is affected by the heating times(0,1,2,3Hr) and thermal stress at the restrained condition of deformation. An influence of concrete cover depths(3,4,5,6cm) are relatively small to strength reduction in the section of the support region. |