Papers by Keyword: Superimposed Slab

Abstract: Mechanical properties of joint between superimposed slabs have a remarkable effect on the bending performance of the whole slab. To study the bending performance of superimposed slabs with different forms of joint, six superimposed slabs were designed and produced. Based on the static loading experiment, load was concentrated on two three-equal-division points, bearing capacity, deformation, cracks of specimens were obtained. Whether there were lattice steel bars in the precast slab or not and different reinforcement in the joint were considered to study the bending performance. The test results show that the failure mode of slab without lattice steel bars is brittle while others are ductile. Lattice steel bars can control the development of cracks along the superposed surface, increasing the shear capacity and improving the ductility of specimens. The bearing capacity of the whole superimposed slab depends on the joint cross section. The joint would not generate a difference to the deflection curves in service condition. When reinforcement in the joint is strengthened, failure modes of slabs will be effectively improved.

Abstract: Tests on two simple supported steel bar truss and concrete superimposed floor slabs have been carried out to study their mechanic behavior and bearing capacities. The one is prefabricated steel truss concrete slab without temporary support in the mid-span to simulate its mechanic status in construction stage, the other is superimposed board (prefabricated + post-cast layer) in use phase. Test results show that the deformation of the prefabricated steel truss concrete slab in construction stage meets the requirement of the Code, and the slab is mainly controlled by deflection instead of cracks; Performance of superimposed board is excellent in use stage; and the steel bar is elastic in both stages during the tests.