Effect of longitudinal joint on the shear-key of hollow core slab which function as an rigid diaphragmGambiro Soeprapto, Mukhlis Sunarso, Sumarsono, Ferryandy Murdono, Winda Agustin and Raynelda SiahaanMATEC Web Conf., 101 (2017) 01017DOI: https://doi.org/10.1051/matecconf/201710101017