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进行了7个按实际工程2∶3比例缩尺、75°倾斜的钢管混凝土斜柱抗剪环-环梁节点试验。其中5个试件采用单调方式加载,2个试件采用低周反复方式加载。试验过程中,对环梁截面上、下环筋,环梁箍筋以及纵梁纵筋的应变分布及大小进行了量测,记录了试件的荷载-位移曲线。改变试件环梁环筋与纵梁纵筋的比例,改变环梁箍筋形式及加配特殊构造钢筋等措施,对斜柱抗剪环-环梁节点的宏观受力机理、最终破坏形态、受力性能及其影响因素等进行了分析研究。试验结果表明,通过对环梁合理配筋构造,抗剪环-环梁节点能够有效地传递框架梁端的弯矩和剪力;无论最终破坏发生在框架梁端还是环梁内,试件都能达到所要求的承载能力和延性;加大环梁截面高度与纵梁截面高度的比例,可将试件破坏时混凝土的压碎区由环梁斜裂缝下端转移到纵梁端下部,从而形成纵梁端发生弯曲破坏的理想破坏模式。
Seven shear-ring-ring beam joints of steel-concrete concrete slant columns with a scale of 2:3 and an incline of 75° were measured. Five of the specimens were loaded in a monotonous manner, and two specimens were loaded in a low-cycle method. During the test, strain distributions and sizes of upper and lower ring ribs, ring beam stirrups and longitudinal beam longitudinal bars were measured. The load-displacement curves of the specimens were recorded. Change the ratio of the annular ring bars of the specimen to the vertical bars of the longitudinal beams, change the form of the ring beam stirrups, and add special steel bars to the structures. The macroscopic mechanical mechanism, final failure modes, and the influence on the shear ring-ring beam joints of the inclined columns Force performance and its influencing factors were analyzed. The test results show that the shear ring-ring beam node can effectively transmit the bending moment and shear force at the end of the frame beam through the reasonable reinforcement structure of the ring beam. No matter whether the final failure occurs at the end of the frame beam or the ring beam, the test piece can To achieve the required load capacity and ductility; to increase the ratio of the height of the cross-section of the ring beam to the height of the cross-section of the stringer, the crush zone of the concrete can be transferred from the lower end of the oblique crack of the ring beam to the lower end of the stringer at the time of the failure of the test piece, thereby forming a longitudinal The ideal failure mode of bending failure at beam ends.