再生混凝土框架中节点抗震性能试验研究

Experimental study on seismic behavior of recycled aggregate concrete frame interior-joints

文章通过2榀再生混凝土框架中节点试件在低周反复荷载下的加载试验,对其破坏形态、滞回特性、位移延性、耗能性能、刚度退化等进行了研究。结果表明,再生混凝土节点受力和破坏过程可分为初裂阶段、通裂阶段、极限阶段、破坏阶段。节点核心区剪切破坏时,表现出明显的脆性性质,施加适宜的轴压力可以延缓核心区的开裂。再生混凝土试件具有良好的延性和一定的耗能能力,依据现行规范及构造措施要求可以用在抗震设防地区。

Two frame interior-joint specimens of recycled aggregate concrete（RAC） were tested under the low-frequency reversed lateral loading to study their failure mode, hysteresis characteristics, displacement ductility, energy dissipation capacity and stiffness deterioration. The result shows that the whole stress and destruction process of the RAC frame interior-joints can be divided into the initial crack phase, the full-crack phase, the ultimate phase and the destruction phase. When the shear failure occurs in the core area of joint, it shows the obvious nature of brittle fracture. The appropriate axial pressure can delay the crack development in core area. The RAC specimens also have good ductility and certain energy dissipation capacity, thus can be well used in the seismic fortified zone according to the current requirements of specifications and construction measures.