Based on the piers mode shape function, this paper studied the methodology of structure ductility coefficient by modal test and the procedure of the structures inelastic seismic force.
以桥墩的基本振型函数为基础，推导出基于试验动力参数的在役桥梁结构延性系数的计算公式，并给出了结构非弹性地震力的求解方法。
If the equipment vibration period is hard to get, we could use the static force seismic coefficient theory to define the seismic effect to ensure the equal safety of the equipment and building.
对周期确定较难的设备，通过静力地震系数法，确定地震作用，以求设备与建(构)筑物处于同等安全度。
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。
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