冲击波作用下剪力墙结构人防地下室倾覆的简化算法

Simplified analysis of the collapse of shelters attached to shear-wall structures with blast loadings

为在人防工程设计中评估冲击波作用下高层建筑对其下附建人防地下室的倾覆作用,提出了剪力墙结构附建人防倾覆的简化算法。该算法基于结构弯曲刚度远大于地基抗倾刚度,将结构与地下室简化为单自由度体系、地基土简化为转动弹簧计算;并通过对地下室倾覆过程中的受力分析提出了弹簧抗力函数的简化三折线形式。该简化算法结果与有限元结果基本一致。在地基抗倾刚度与结构弯曲刚度之比小于0.8时,该算法与有限元方法的计算结果的相对误差小于5%。可见该算法在常见工程条件下是可靠的。

A simplified analysis method was developed to evaluate the overturning response of air defense shelters attached to high shear wall structures with blast loadings. The method simplifies the shelter structure to a single-degree system and the soil to a bending spring whose resistance is given by a simplified tri-linear form. The results show that this method＇s results are very close to finite element results. When the ratio of soil stiffness to the bending stiffness of the structure is less than 0.8, the relative error of this method is less than 5%. Thus, the method is valid for common construction conditions.