Development of compression-bending-shear test setup which can examine RC/SRC columns up to their complete collapse

1.研制了压-弯-剪试验装置。用于钢筋混凝土和/或外包钢钢筋混凝土柱，可进行完全倒塌试验。用钢锤对柱试件施加恒定轴力。柱试件的顶柱和底柱之间不允许有相对转动位移。研制了机械式和液压式并联保持系统。在控制变形单调增加的试验中，试件在恢复力方向为负的阶段也能稳定加载。2.阐明了钢丝网水泥加固剪切破坏型钢筋混凝土柱的抗震加固效果。制作了剪切破坏型柱试件和钢丝网水泥加固柱试件，并进行了大变形试验。试验研究了钢筋混凝土柱的受力性能与纵向钢筋粘结性能的关系。改变了试件纵筋的粘结性能，测试了试件的恢复力特性。详细观察了试件在压缩、弯曲和剪切作用下的破坏形态。试件的纵向钢筋采用异形钢筋和圆钢筋。为了改变粘结性能，用石蜡部分覆盖棒。

1.Compression-bending-shear test setup was developed. It is for reinforced concrete and/or steel encased reinforced concrete columns, and it enables complete collapse test. Constant axial force is loaded to the column specimen by steel weight. Relative rotational displacement between top stub and bottom stub of the column specimen is not permitted. Mechanical and hydraulic parallel keeping systems were developed. The column specimen can be stably loaded even at the stage that the restoring force direction is negative in the test in which the deformation is controlled to increase monotonically.2.The effect of seismic strengthening method for shear failure type reinforced concrete column using ferrocement is clarified. Shear failure type column specimens and strengthened specimens with ferrocement were made and tested up to the extremely large deformation. The specimens failed in shear were repaired and strengthened with ferrocement, and then retested.3.The relationship between the mechanical behaviors of a reinforced concrete column and bond properties of longitudinal rebars is investigated experimentally. Bond properties of longitudinal rebars of specimens were changed and restoring force characteristic of the specimens were exmined. Failure modes of the specimens subjected to compression, bending and shear were also observed in detail. Deformed bars and round bars were used as longitudinal rebars of the specimens. The bars were partially covered with paraffin wax in order to change the bond properties.