An experimental study on one-way reinforced concrete beam-slab substructures for resisting progressive collapse
Chu Mingjin1, Zhou Yulong1, Lu Xinzheng2, Li Yi3
1. Beijing University of Civil Engineering and Architecture, Beijing 100044, China; 2.Key Laboratory of Civil Engineering Safety and Durability of the Ministry of Education, Tsinghua University, Beijing 100084, China; 3.Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China
Abstract：The floor systems consisting of beams and slabs are the main elements of frame strudctures to resist progressive collapse. To assess the influences of various parameters on the progressive collapse resistance of reinforced concrete (RC) frame structures, 8 scaled-down specimens of one-way RC beam-slab substructures with different sectional dimensions and reinforcement ratios were designed in accordance with the Code for Design of Concrete Structures (GB 50010—2010). Furthermore, the vertical loading experiments were preformed to study the material deformation/damage and the progressive collapse resistance of the specimens after the failure of the middle column. The experimental results indicated that the collapse-resisting capacity of the beam-slab specimens was significantly higher than that of the beam specimens with identieal dimensions of the beam section. The collapse-resisting capacity of specimens under the beam mechanism was determined by the cross-sectional dimensions and reinforcement area, while the capacity under the catenary mechanism was only affected by the reinforcement area. The collapse-resisting capacity under the beam mechanism was greatly improved by increasing the width and thickness of slabs, the reinforcement in slabs, and the height of beam. However, the contribution of slab width was not significant when it exceeded a certain value. Only slab width and reinforcement ratio may significantly affected the collapse-resisting capacity under the catenary mechanism. Seismic reinforcement in beams had little influence on the carrying capacity of the scaled-down specimens under the two mechanisms.
