Influence of Aspect Ratio of Joint on Behavior of Interior R/C Beam-Column Joint

结合试验结果和基于有限元法的三维非线性分析结果，讨论了节点高宽比对钢筋混凝土梁柱内节点受力性能的影响。纵横比是梁深度除以柱深度的值。试件为接头破坏型，接头高宽比为0.6 ~ 2.0。试验结果和分析结果表明：（1）对于梁高与柱高相近的大高宽比梁柱节点，不能用本文提出的高宽比节点破坏模式分类方法进行分类;（2）对于大高宽比梁柱节点，节点抗剪强度不能用常规设计经验公式进行估算。根据节点与柱受力状态的相似性，节点抗剪强度可按柱极限抗剪强度的经验公式计算。3通过对节点压应力的检验，可以预测，支撑作用是节点极限抗剪强度的主要机制。4最大强度时的层间位移可以通过建议的柱和5三维非线性分析结果表明，在相同的节点剪切水平下，高宽比试件的节点压应力和节点剪切变形较大.

The influence of aspect ratio of joint on behavior of interior R/C beam-column joint is discussed from the experimental results and the results of three-dimensional nonlinear analysis based on Finite Element Method. The aspect ratio is the value that divides beam depth by column depth. The test specimens are joint failure type with the value of aspect ratio of joint from 0.6 to 2.0. The following conclusions are obtained from the test results and the results of analysis:1 It is impossible to classify the failure modes of beam-column joints with large aspect ratio by means of proposed method for aspect ratio which beam depth is nearly equal to column depth.2 The joint shear strength of beam-column joint with large aspect ratio cannot be estimated by experimented formulas using conventional design practice. From the similarity between the stress state of joint and column, the joint shear strength can be calculated by experimental formula for ultimate shear strength of column.3 From the examination of compressive stress in joint strut, it can be predicted that strut action is main mechanism at the ultimate joint shear strength.4 Story displacement at maximum strength can be calculated by means of the proposed experimental formula for column and beam deformations, and the measured value for joint deformation, respectively.5 The results of three-dimensional nonlinear analysis indicate that the strut compressive stress in joint and the joint shear deformation for specimen with large aspect ratio is large at the same joint shear level.