基于性态的约束砖砌体结构接近倒塌时的安全研究

Performance-based Research into Constraint Brick Masonry Structure Safety

为改善约束砖砌体结构的抗震性能,通过分析32个约束砖砌体墙片试验数据,得出延性系数值,并拟合出延性系数与高度和高宽比之间的关系式。结果表明,高宽比越大延性系数越小。因此,为使结构具有一定的延性,应控制高宽比;同时提出约束砖砌体结构接近倒塌时层间目标位移计算公式,并与8层约束砖砌体结构动力时程分析结果平均值进行比较,计算值与平均值是比较接近的。

In order to improve the performance of constraint brick masonry structure, through analyzing the test data of thirty-two constraint brick masonry wails, ductility coefficient values were derived, and the relation formula between ductility coefficient and height, height-width ratio were fitted out. The results show that the greater the height-width ratio, the smaller the ductility coefficient is, so the height-width rati- o should be controlled, in order to make the structure have certain ductility. A formula for calculating the target displacement between layers near collapse of constraint brick masonry structure was proposed. Comparison of the results obtained using the formula and the average values of the dynamic time history of eight layers constraint brick masonry structures, shows that the calculated value is close to the average val- ue of dynamic time history.