On the model of the optimum design , it ' s proceed modal of fea ; with the superior design , structural vibration period is studied for providing the theories calculation of construction engineering ; calculating many load cases , some parameters are given and provide the beneficial datum for actual engineering . the research in task evinces the construction cost can be reduced by optimize design and has good dynamic characteristic . optimum technology has a better project applying value in structural design 并在优化设计模型的基础上，对其进行模态有限元分析；研究其在最优设计条件下，结构自振特性问题，为工程结构的动力分析提供理论计算依据；同时对刚架进行多工况荷载组合抗震计算，得出地震作用参与荷载工况组合时，各设计参数间的关系并得出结论，为实际工程设计提供有益的参考资料。
Some comments on the design , application of lightweight steel structure are put forward in the paper . the finite element method , structural dynamics theory and structural analysis software ansys are applied to investigate the static , dynamic characteristic and aseismic of lightweight steel structure of sleeper workshop for lanzhou railway bureau quarrying segment 运用有限元方法、结构动力学理论和国际上通用的结构计算分析软件ansys ，对兰州铁路局采石段轨枕车间厂房轻钢结构在各种荷载组合下的静承载能力、动力特性和抗震性能进行了分析研究。
