实现轴压比相似的预应力加载法在砌体结构振动台试验中的应用

Application of the prestressed loading method with realization of axial compression ratio similarity in masonry structure shaking table test

为了满足振动台试验中砌体墙体轴压比相似的要求,提出了一种预应力加载法。采用该预应力加载法对一座底商砌体结构模型进行了振动台试验加载,共进行了21次地震动输入,获取了不同地震动输入水平下的结构反应及结构的相应模态。试验结果表明,该预应力加载法提高了整体结构的竖向压力,在提高结构构件轴压比方面是可行且有效的。由试验结果反演可知,原型结构达到了8度小震不坏的抗震设防目标,高于相关规范中的抗震性能要求。

In order to satisfy the requirement of the axial compression ratio similarity of the masonry wall in shaking table test, a prestressed loading method was proposed. The method was used in the shaking table test loading of a commercial masonry structure model. The model was subjected to twenty-one times of different ground motions, and the earthquake responses and modal properties of the model were assessed. Test results prove that the prestressed loading method increases the vertical compression of the whole structure and is effective in enhancing the axial compression ratio of structural specimens. From the inversion of the test results, the prototype structure can achieve the seismic fortification goal of no damage with 8 intensity weak earchquake,which is higher than the requirements of the seismic performance in the relevant codes.