Abstract: Macroscopic analysis for some damages in Mexico Earthquake and idiscusson to another three examples are made in this paper. the result shows that the vertical earthquake-force is the primary cause for the damages to some structures Therefore the effects of vertical earthquakeforce should be considered in the design of against-earthquake.

摘要： 本文对墨西哥地震中某些震害的宏观分析以及对三个实例的讨论表明:竖向地震力是造成一些结构破坏的主要原因;竖向地震力使框架柱的轴力增大,从而使延性降低;竖向地震力引起柱的轴变二阶效应对结构的抗震极其不利。作者提出,传统的只考虑水平地震力的抗震设计方法,不能保证结构的安全,应该计竖向地震力的影响。