| Title |
Variation of Structural Capacity of RC Deep Beams with Different Shear Span-to-Depth Ratios Damaged by Fires |
| Authors |
Seo Soo-Yeon ; Yoon Seung-Jo ; Kim Yeong-Man ; Choi Ki-Bong |
| Keywords |
Reinforced Concrete Deep Beam ; Fire Exposure Time ; Shear Span-to-depth Ratio ; Strength Reduction |
| Abstract |
This paper presents experimental result of reinforced concrete deep beams with various shear span-to-depth ratios damaged by fire. Main parameters in the test were fire exposure duration and shear span-to-depth ratio. Nine RC deep beam specimens were made and six of those were exposed to fire by following standard fire loading curve. And then beam test was performed for those under simple support condition. Strength variation of materials by the exposure time and temperature of fire was evaluated through material test for concrete and reinforcements damaged by fire. In order to predict the specimen's structural capacity, analysis was performed using nonlinear sectional analysis and truss analogy. From the research, it was found that the strength of RC deep beam damaged by fire was more seriously affected by level of temperature than exposure time during fire loading. However, concrete tended to be dry as the exposure time increased so that the overall behavior of member changed to brittle failure mode. In order to suitably predict the strength of deep beam damaged by fire, the change of properties of concrete and reinforcements at each location should be well defined and appropriately reflected in analysis model. |