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在水平地震作用下,小跨高比连梁在达到所需延性之前易发生剪切失效,难以满足抗震设防要求。试验研究表明,纤维增强混凝土对角斜筋小跨高比连梁(FRC连梁)具有较好的延性。为了进一步提高小跨高比连梁的延性,提出在FRC连梁配筋基础上,在对角斜筋上增设拉筋、在受力纵筋靠近墙肢150mm长度范围内套上PVC套管、在对角斜筋上增设拉筋同时在受力纵筋靠近墙肢150mm长度范围内套上PVC套管三种改进方案,并建立有限元模型对三种改进方案进行对比分析。研究表明,三种改进方案均可提高FRC连梁延性和耗能能力,其中在对角斜筋上增设拉筋同时在受力纵筋靠近墙肢150mm长度范围内套上PVC套管的改进方案延性和耗能最大,相较原方案更易实现连梁为联肢墙结构第一道抗震设防防线的要求。
Under the action of horizontal earthquake, it is easy to produce shearing failure before reaching the desired ductility, which makes it difficult to meet the seismic fortification requirements. Experimental studies show that the FRC beams have good ductility for the FRC beams. In order to further improve the ductility of the beams with a small span ratio, a reinforcement was proposed on the diagonal diagonal reinforcement based on the FRC beam reinforcement. A PVC sleeve was placed over the length of 150 mm of the longitudinal reinforcement, Reinforcement is added to the diagonal diagonal bars, and three kinds of improvement programs are put on the PVC ferrules within the 150mm length of the longitudinal reinforcement. The finite element model is established to compare and analyze the three improved schemes. The results show that all the three improved schemes can improve the ductility and energy dissipation capacity of the FRC beams. In addition, the reinforcement of the diagonal reinforcement bars and the improvement of the PVC bushing inside the 150 mm length of the reinforcement are also provided Ductility and energy consumption of the largest, compared with the original scheme is more likely to achieve even the first joint of the beam wall structure of the seismic line defense requirements.