传统风格钢筋混凝土梁-柱节点抗震性能试验研究

Experimental study on seismic behavior of RC column-beam joint built in traditional style

传统风格现代建筑结构是继承和创新地域建筑文化的良好载体,但由于构造方法不同,使其与常规现代结构有较大的区别。通过4个模型比例为1∶1.5的传统风格钢筋混凝土梁-柱中节点的低周反复荷载试验,研究了该类节点的破坏机理、承载能力、滞回特性和耗能能力等抗震性能,分析了体积配箍率、上下梁净间距对该类节点抗震性能的影响。结果表明:传统风格钢筋混凝土梁-柱节点在加载过程中形成了上、中、下3个小核心区,最初裂缝出现在下核心区,随后为上核心区和中核心区,最终破坏时3个小核心区均出现了"X"形剪切裂缝,其中下核心区破坏最为严重;随着体积配箍率的增大,节点极限承载力提高,滞回曲线更为饱满;随着上、下梁间距的增大,节点极限承载力基本不变,滞回曲线饱满度明显下降。与常规钢筋混凝土梁-柱节点相比,传统风格钢筋混凝土梁-柱节点的位移延性系数和极限阶段的耗能系数较小,延性和耗能性能相对较差。

The modern architecture built in traditional style is a good carrier of innovation and inheritance of local traditional architecture culture and is unlike general modern structures because of the different structural methods. In order to investigate the seismic behavior of RC column-beam joint built in traditional style, 4 specimens with scale of 1 ： 1.5 were tested under low-cyclic reversed loading. Some different conditions were taken into account to analyze their influence on the seismic behaviour, including the parameter of volume-strip ratio, the spacing of beam. The behaviors of joint models, such as the failure mechanism , bearing capacity, hysteresis characteristics, energy dissipation capacity and so on were analyzed. The results indicates that, 3 small core zones（ upper, middle and lower core zone ） appear in the RC column-beam joint built in traditional style, during loading. The initial cracking occurs in the lower core, afterwards in the upper and middle cores. And X-shaped shearing crack appears in all the three cores when the joint destroyed ultimately, especially the destruction in lower core. With the increas- ing of volumetric stirrup ratio, the ultimate bearing capacity of the joint improves, and the hysteretic curves become plumper. With enlarge basically unchanged, ment of the space between upper and lower beam, the ultimate bearing capacity of the joint and the the hysteretic curves become less plumper. Compared with normal RC column-beam joint, the displacement ductility factor and the energy dissipation coefficient during limit stage of RC column-double beam joint built in traditional style are smaller , and the the ductility and energy dissipation are worse.