多线铁路

由于考虑了箱梁的约束扭转，该模型能够分析复线或多线铁路桥在偏载作用下的横向振动问题。

Considering the restrained torsion , we can analyze the lateral vibration of double-line or multiple-line railway bridges under unbalanced loads with the model .

疲劳问题是衡量桥梁寿命的关键指标之一，因此对多线铁路桥梁疲劳问题的研究也提到日程上来。

Fatigue problem is one of the key indexs to scale the bridge life , therefore the research on fatigue problem in multiple-track line bridge becomes important .

随着社会的发展，铁路运量日益增大，单线桥梁和双线桥梁已不能满足发展的需要，修建多线铁路桥梁成为日后发展的必然趋势。

With the development of society and the increasingly augment on carry capacity of railway , single-track line bridge and double-track line bridge will no longer satisfy the demand of develop . It is a trend to build multiple-track line bridge in the future .