【摘要】 为解决异形梁柱框架节点配筋拥挤的问题,提出将梁中部分钢筋分散到翼缘中,并对分散式配筋梁异形柱(L,T和+形)框架顶层节点在低周反复荷载下的抗震性能进行了试验研究.通过6个试件的试验,比较了分散配筋与异形柱框架顶层节点的差异,研究节点核心区的开裂荷载、屈服荷载、极限承载能力、破坏形态和滞回特性等力学性能,以及按不同比例分散梁上部钢筋对节点抗震性能的影响.试验研究表明,T形、十字形截面柱节点,适当的分散比例不会给框架节点的受力性能和抗震性能带来不利影响.但L形截面柱节点分散配筋将加剧累积损伤,刚度退化较为严重.同时理论分析表明分散钢筋在板中的分布范围应予以严格控制,以防止发生锚固破坏.更多还原

【Abstract】 To overcome the problem that steel bars are put too close at a frame joint with special-shaped beam and column,mechanical performance of 3 groups of 6 RC frame joints with special-shaped(L,T and+) column and dispersed-steel bars-beam on the top floor under cyclic loads were experimented.Experimental comparison was conducted between special-shaped(L,T and+) column and normal beams.The cracking load,yielding load,ultimate bearing capacity,failure patterns and hysteretic properties at joint core area were investigated.The seismic behaviors of the joints with different proportions of dispersed-steel-bar beams were analyzed.The results of experimental analysis indicate that the mechanical and seismic behaviors of frame joints with T-shaped and+-shaped column are nearly not changed when suitable proportion steel bars are dispersed to flange plane.Stiffness degeneration of frame joint with L-shaped column is rather serious due to the concrete damage stiffness.Theoretical result indicates that distributing area of the dispersed steel-bar beams in the flange plate should be strictly controlled to avoid the anchor destroy.更多还原