配筋砌体结构墙体出平面反应试验研究

Experimental research on out-of-plane responses of reinforced masonry structural walls

为研究配筋砌体结构出平面反应,将配筋砌块未注芯的孔灌注了高密度铁砂,以提高缩尺模型材料的等效密度,更真实地模拟墙体出平面惯性效应。利用推导的模型与原型的相似关系,设计并实施了振动台试验。结果表明,模型结构主要以压弯变形为主,在现行规范规定的构造措施下,足以抵抗设防地震造成的墙体出平面破坏。通过敲击试验得到墙体出平面振动频率,该频率相对较高,远离地震动卓越频率。相邻楼层出平面频率不完全相同,振动的相位可能时而同相,时而反相。

In order to study the out-of-plane responses, the simulation of the out-of-plane inertial responses of the wall under the influence of earthquake could be more real by means of potting the high-density cast iron particles in the hollow hole of the reinforced masonry to increase the equivalent density of the material in scale-down model. Based on the results of the similarity relations between the actual wall and the model wall, the earthquake simula- ting experiments on shaking table are conducted. The resuits show that the compression-bending deformation in the model structure is observed and the construction measures stipulated in current code have remarkable ability to pre- vent the out-of-plane damage to walls from the fortified earthquake. The wall out-of-plane frequency of vibration is obtained shaking by beating experiment. And the relatively high out-of-plane frequency of vibration is far from the earthquake predominant frequency. The out-of-plane vibration phase between adjacent floors is likely to be ho- mophase or reversal of phase, because the out-of-plane vibration frequencies are various.