EVALUATION OF FLANGE-TO-FLANGE CONNECTION OF PRECAST CONCRETE DECK USING UHPFRC

摘要

Recently, as the social demand for accelerated construction has increased, the importance of robust connection details for precast concrete construction has been highlighted. These connections are required to secure structural performance and to ensure high durability. In this study, the structural responses of moment connections of a precast concrete deck filled with ultra-high performance, fiber-reinforced concrete (UHPFRC) are investigated. First, flexural tests of large-scale precast beam specimens connected using UHPFC are conducted. In these tests, two types of non-contact splice details, straight bars and U-bars, were applied along with various joint widths ranging from 10 to 4 in. [250 to 150 mm]. Then, the fatigue behavior of two precast concrete deck specimens with a joint width of 7 in. [180 mm] was evaluated. The test results indicate that UHPFRC had considerable bonding performance with rebars. As a result, the flexural behavior of the joint connection was not appreciably affected by the splice details, and the precast concrete deck specimens also exhibited acceptable fatigue responses.