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.
另外，分析比较了一座直线多室箱梁桥在不同支承方式下恒活载效应、预应力效应、次反力和二次内力的异同。
Additionally, the difference of total effect and secondary forces due to prestressing tendons under two kinds of boundary conditions is given.
墩顶负弯矩主要来自于二期恒载和活载。当桥墩较高时，刚架桥可简化为连续梁桥计算。
When the pier is high, rigid-framed bridge can be simplified to continuous beam bridge.
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