| Title |
Behavior of Restrained Beam and Slab Reinforcement in Region of Delay Joint |
| Authors |
Lee Myung-Ho ; Park Hyung-Cheol ; Oh Bo-Hwan |
| Keywords |
Delay Joint ; Underground Parking Lot ; Crack ; Beam Reinforcement ; Slab Reinforcement ; Monitoring |
| Abstract |
Delay joints are temporary joints that are left open for a certain time during construction to allow a significant part of the shrinkage to take without inducing stresses. Recently, delay joints have been used to a considerable extent in slabs of underground parking lots, for the purpose of reducing shrinkage stresses and minimizing shrinkage cracks. Mark Fintel proposed that delay joint is usually 60 to 90cm wide across the entire building. Development length of HD13 for longitudinal reinforcement of slab is about 60cm, but, development length of HD25 for longitudinal reinforcement of beam is over 200cm. So, different development lengths between slab and beam make difficult to construct the delay joint. In this paper delay joints are constructed to have same width in slab and beam regions uncutting reinforcements in beam region. Also, behavior of restrained beam and slab reinforcement in regions of delay joint was evaluated. |