设置中空层的装配式钢筋桁架楼板受弯性能研究

To improve the construction efficiency and thermal and sound insulation performance on the basis of good mechanical behaviors of the prefabricated slab, the prefabricated steel truss reinforced concrete slab with hollow layer was proposed, consisting of the steel channels, cement-fiber board, reinforcement truss, and concrete. Two specimens with different spans were designed and prepared to conduct bending test. It is concluded that the key parts of the specimens are elastic at the serviceability limit state, meeting the requirements of the design code. The slabs fail by the fracture of the steel channel, with the bottom reinforcements yielding. Following the test, the ABAQUS software was applied to perform numerical analysis. The parametric analysis results show that the slab thickness and the diameter of the reinforcement are key parameters for the flexural capacity of the slab. When the slab thickness increases from 85 mm to 115 mm, the flexural capacity of the slab increases by 26% . When the diameter of the reinforcement in the truss increases from 8 mm to 14 mm, the flexural capacity of the slab increases by 25% . Based on the existing theory, a calculation method of bending capacity was proposed for the prefabricated steel truss reinforced concrete slab with hollow layer, considering the contributions of the reinforcement truss, the bottom reinforcements, and the steel channel. The experimental and numerical results is within ± 10% .