钢骨高强混凝土框架节点拟动力试验研究

通过5个低周期反复荷载下钢骨高强混凝土柱与钢筋高强混凝土梁框架边节点试验,分析了节点核心区水平剪力的分配情况,讨论了节点核心区水平剪力的计算方法,研究了节点核心区中高强混凝土、钢骨腹板及箍筋在各个受力阶段的抗剪受力情况·研究表明,节点核心区钢骨的存在并不能提高节点的抗裂承载力,却能大大增加节点的抗剪承载力,同时在节点荷载 位移曲线上没有明显的拐点;节点核心区抗剪强度由核心区混凝土、钢骨和箍筋三部分提供,且高强混凝土是节点抗剪能力的主要承担者·

Experimental Study on Frame Joints of Steel-Encased High-Strength Reinforced Concrete with Dynamics Simulation

The experiments of five joints of both steel-encased high-strength concrete column and high-strength reinforced concrete beam without steel-encased were carried out under cyclically reversed loading. Analyzing the horizontal shearing force distribution in joint core area, the calculation of such shearing force is discussed, as well as the shear stiffness conditions of the high-strength concrete, steel section web and hoopings in joint core area. The results indicate that the crack resistance of the section doesn't increase but the shear stiffness of joints increases greatly. The inflexion point on the loading-displacement curve is not found obviously because the steel section is encased in the high-strength concrete. The shear stiffness of joints is provided by that of concrete, section web and hoopings, among which the high-strength concrete is the predominant one.