Prediction of the behavior and damage of RC members subjected to various loadings

对后张法梁柱节点采用不同类型的筋进行了试验，研究了不同类型的筋对节点受剪性能的影响。节点的抗剪强度超过了基于AIJ设计指南公式的值。另外还进行了钢筋混凝土膝关节和T型节点的试验，研究了节点的锚固长度和横向配筋对抗剪强度的影响。进行了三轴应力状态下悬臂柱的双向弯曲试验，明确了钢筋混凝土柱塑性铰的受力性能，从而提高了柱在承受较大轴力和双向反复变形时损伤预测的准确性。在试验方案中，进行了8个半尺度柱和8个足尺尺度柱在恒定或变轴向力作用下的双向反向位移试验，以研究加载历史和强度对损伤发展的影响。在高轴向力作用下，双侧位移下的试件损伤严重。在分析程序中，采用纤维模型进行截面分析，研究了约束对核心混凝土性能的影响。构造了8个预应力混凝土梁柱节点。前四个试验单元的实验参数是锚固板的位置和肌腱的直径。对于其他四个试验单元，使用了三种类型的预应力钢筋：圆钢、钢绞线和变形钢筋。它们用于研究粘结特性对试验单元荷载-位移曲线的影响。试验结果表明，锚固板的位置对最大承载能力和滞回曲线有较大影响。肌腱差异的影响不明显。

Experiments were conducted on the post-tensioned external beam-column joints with different types of tendons to investigate the their effects on the shear behavior. The shear strength of the joint exceeded the value based on the equation on the AIJ design guidelines. Another experiments were conducted on the RC knee and T joints to investigate the effects of anchorage length and transverse reinforcement in joints on the shear strength. Corner beam-column joints were also tested to see the effect of bidirectional bendingCantilever columns was tested under triaxial stress state to clarify the performance of a plastic hinge of reinforced concrete columns in order to increase the accuracy of prediction procedure to evaluate damage when columns experience large axial force and cyclic reversal bilateral deformations. In an experimental program, eight half scale columns and eight full scale columns were tested under the reversal bilateral displacement with constant or variable axial force in order to study the effects of loading history and intensity on the damage progress. Damage was severe for specimens under bilateral displacement with high axial force. In an analytical program, a section analysis using a fiber model was employed and the effect of confinement on the behavior of core concrete was studied.Eight prestressed concrete beam-column joint assemblages were constructed. The experimental parameters for the first four test units were location of the anchorage plate and the diameter of the tendons. For the other four test units, three types of prestressing steel were used: round bars, strands and deformed bars. They were used for investigating the effect of bond characteristics on load-displacement curves of the test units. The test results indicated that the location of the anchorage plates had significant influence on maximum loading capacity and hysteretic loops. Effect of difference in the tendons was not noticeable.