悬索桥是一种高次超静定柔性结构，由刚度相差较大的构件(主缆、吊索、加劲梁)组成。
Suspension bridge is a type of flexible structure with high degree of statical indeterminacy and composite by different components (main cable, suspender cable and pylon) with different stiffness.
主缆是悬索桥的重要受力构件，精确计算其空缆线形是悬索桥上部结构施工成败的关键。
The cable is the important component of suspension bridge. Determination of initial states of cable of large span suspension bridge is the key part of the upper structure construction.
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