| Title |
A Study on the Changing of Negative Moment Capacity according to the Placement of Top Flange Reinforcing Steel under Monotonic Loading |
| Keywords |
effective flange width ; 2-layered or single-layered tension reinforcement ; ultimate strength |
| Abstract |
Due to the congestion of the reinforcement, it is difficult to arrange properly 2-layer tension reinforcement at the beam-column joint. In ACI and Eurocode, it is recommended to distribute the tension reinforcement within the effective width of flange uniformly to control flexural cracks.
An experimental study of beam-to-column joints is conducted to evaluate the cracking and damage pattern, load-displacement relation, strain of re-bar and the ultimate strength of the joints with the 2-layer tension reinforcement within rectangular section and the single-layered tension reinforcement at the beam flange. The distribution of the tension reinforcement within the effective flange width was the variable in constructing specimens.The load-displacement curves of the specimens were similar, but the ultimate strength of the specimen with 2-layer tension reinforcement was larger than that of the single-layered by maximum 17.4%. Based on the results of this experimental study, for the single-layered tension reinforcement it is recommended to provide additional reinforcement at the effective width of flange to attain ultimate load capacity equal to the 2-layered case. |