A Study On Diagonal Compressive Force Transmission Mechanism through Concrete of RC Column

1. 明确了钢筋混凝土柱混凝土自顶向下斜向传递的最大抗压力。制作了钢筋混凝土柱试件并进行了试验。试件钢筋为高强PC钢筋，消除了钢筋与混凝土之间的粘结。制作了钢筋混凝土柱试件，并进行了压剪弯试验。剪切力和压缩力是不同的。弯矩与剪力成正比。研究了钢筋混凝土柱的抗压力、剪力、轴向变形和水平变形之间的关系。类比塑性理论，推导了钢筋混凝土柱的三轴非线性恢复力特性。钢筋混凝土柱的轴向变形与水平变形之间的关系可以用所提出的恢复力特性模型来描述。所建立的三轴非线性恢复力模型能较好地描述钢筋混凝土柱在三维变形过程中的总体行为。利用钢筋混凝土柱的三轴非线性恢复力特性，分析了钢筋混凝土结构对三维地震运动的响应。结果表明，一维非线性响应分析有可能低估钢筋混凝土结构在三维地震动作用下的最大变形。

1. The maximum compressive force transmitted diagonally from the top to the bottom through the concrete of RC column was clarified. RC column specimens were made and tested. The rebars of the specimen were high strength PC bars and the bond between rebars and concrete was eliminated.2. RC column specimens were made and tested under compression-shear-bending. Shear force and compressive force were varied. Bending moment was proportional to shear force. Relation among compressive force, shear force, axial deformation and horizontal deformation of RC column was examined.3. Tri-axial non-linear restoring force characteristic of RC column was formulated using the analogy to the theory of plasticity. Relation between axial deformation and horizontal deformation of RC column can be described by proposed restoring force characteristic model. The proposed tri-axial non-linear restoring force model can describe well the total behaviors of RC column subjected to three -dimensional deformation history.4. Response of RC structure to three dimensional earthquake motions was analyzed using the tri-axial non-linear-restoring force characteristic of RC columns. As a result, it is found that one-dimensional non-linear response analysis has a possibility to underestimate the maximum deformation of RC structure due to three-dimensional ground motions.