小砌块墙体抗震延性性能的试验研究

通过正交试验设计方法设计的一套低周往复荷载试验，对混凝土空心小砌块墙体的基本抗震性能指标之一-延性系数进行了较深入的研究。通过正交试验的数理统计计算，揭示了工程实践中墙体高宽比，砂浆强度，墙体正应力和芯柱数量等重要因素对小砌块墙体延性系数的不同作用，通过计算结果的对比，对尚存争议的小砌块墙体延性（系数）的确定方法提出了看法，认为目前我国规范规定的方法虽然基本合理，但有待于改进。

Experiment and Analysis of Ductility of Small Hollow Concrete Block Walls

By testing some specimens of small concrete block walls under low cyclic loading, the ductility of the walls was analyzed. Based on the statistics and analysis of results of orthogonal experiments the four factors influencing the ductility of the walls,including the aspect ratio of the walls, the strength of mortars, the normal stress in the walls and the grouted masonry strips (i.e. the vertical reinforcement) of the walls, were discussed. The results show that the number of grouted strips is the most important factor to the ductility of the walls, and the normal stress in the walls is also important to the ductility of the walls in a lower degree. Furthermore, some analyses were carried out to compare the feasibility of some methods to decide the ductility of those masonry walls without obvious yield points. The analyses show that the method to decide the ductility of masonry walls suggested in Chinese construction criteria is reasonable but should be improved in some degree.