建立了桥梁的有限元振动方程；
Vibration equations for the bridge are derived using spatial beam element.
与此同时，郦道元还为地理与其他学科之间建立了桥梁，使地理成为一门综合学科。
Meanwhile, LI Dao-yuan successfully set up a bridge connected with other subjects, which made the geography become a comprehensive science.
根据桥梁结构的构造特点，将桥梁系统分为多级子系统，从而建立了桥梁损伤评估的层次结构模型。
According to its characters, bridge system was divided into several multilevel-systems, and a hierarchy assessment model was established.
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