Flexural Behavior of Plastic Steel Fiber Reinforced Lightweight Aggregate Concrete Beams Confined Locally in Compression Zone
NIU Jiangang1, XU Wenming1, LIANG Jian2
1 School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014000, China 2 School of Civil Engineering, Guangxi University, Nanning 530000, China
Abstract: In order to improve the flexural performance of the beam, six reinforced plastic steel fiber reinforced lightweight aggregate concrete beams were designed by using rectangular hoops to restrain the local compression area. The influence of the longitudinal reinforcement ratio and the concrete strength on the flexural mechanical properties of the beam was analyzed and the finite element analysis was carried out. The results show that when stirrups are used to restrain the concrete in the compression zone, the ultimate compressive strain in the local compression zone increases, and the bearing capacity and ductility of the specimen increase significantly; with the increase of reinforcement ratio, the bearing capacity of the specimen increases significantly, and the over reinforcement failure of the beam with high reinforcement ratio is improved obviously; with the increase of concrete strength in the restraint zone, the bearing capacity of the beam increases, while the ductility decreases. The results of finite element analysis show that the ultimate compressive stress of the concrete in the compression area becomes larger after the stirrup is placed locally in the compression area, which greatly improves the stress concentration in the compression area in the middle of the beam span, thus inhibiting the crushing failure of the concrete at the edge of the compression area of the beam, and improving the bearing capacity and ductility of the beam.
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2021, Vol. 35 
