| Title |
Experimental Verification of Design Approaches of RC Transfer Girders Having Short End Shear Span |
| Authors |
Ko Dong-Woo ; Lee Han-Seon ; Woo Sung-Woo |
| Keywords |
Transfer Girder ; Strut-and-tie Model ; X-type Shear Reinforcement Cage |
| Abstract |
This paper explains three types of design approaches for reinforced concrete transfer girders and evaluates the capacity of transfer girders by 1/2.5 scaled gravity load test results. The first type of girders employed the conventional approach (AL-86), the second type of girders was designed by strut-and-tie procedure (SL-72), and the third type of girders was reinforced by X-type reinforcement cage in shear critical region (XL-60). The conclusions are as follows: (1) Since upper walls contribute to flexural behavior of transfer girder as a compression region, moment capacities of three specimens are two times larger than the required moment. This shows that the strut-and-tie model, including the upper wall, procedure may reduce the longitudinal reinforcement compared to the conventional approach for transfer girders whose a/d is less than 1.0. (2) With the exception of the AL-86, the shear capacities of the two types of girders (SL-72 and XL-60) do not satisfy the required shear force. Overestimation of shear forces transmitted directly by compression strut induced the lack of shear capacity in SL-72, and XL-60 did not show the full shear capacity due to the anchorage failure in the X-type reinforcement cage. |