Factually there is no assurance for ductility in this coefficient. Furthermore, the seismic force is comparatively lower in design than in fact. Both of them necessarily increase the seismic risk.
实际规范中并没有延性构造保证，加之我国当前设计地震作用相对偏低，更增加了地震破坏的危险性。
Some results are indicated that horizontal and vertical seismic force must simultaneously be considered in the seismic study and design of the prestressed-arch structures.
结果表明，在预应力拱架结构的抗震研究中，需同时考虑水平和竖向地震作用。
The method of direct displacement-based seismic design is an important improvement on force-based seismic design.
直接基于位移的抗震设计方法是对基于力的抗震设计方法的重大改进。
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