通过改变主梁恒载重量、拉索倾角、无索区长度等结构参数，分析结构参数变化对结构受力的影响。
Structural internal force is calculated by changing constant load of the main girder, the cable Angle, the length of unsupported deck.
提高重轨质量和单重以增加列车载重和车速，扩建现有轨梁轧机，可以满足2000年前需要。
The demand up to the year 2000 can be satisfied by improving quality and raising the weight of rails and by expanding existing rail-and-beam mills.
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