Abstract: With the increasing of suspension bridge's span, the gravity stiffness of suspension cable itself is more important than vertical deflection resistance stiffness of stiffening girder which is serviced for the whole structure. In order to provide more knowledge of gravity stiffness of suspension cable, in this paper, gravity stiffness of suspension cable is formulated briefly and theoretically in case of ignoring the existing of the stiffening girder.The deformation and internal force of suspension cable can be calculated approximately in this way.

Key words: gravity stiffness, suspension bridge, stiffness

摘要： 随着悬索桥跨度的增大,加劲梁的竖向抗弯刚度提供给整个桥跨结构的刚度仅占次要地位,而悬索自身的重力刚度却占有重要的作用.为加深对重力刚度的进一步认识,笔者对特大跨度的悬索桥的重力刚度进行简要的理论推导,在忽略加劲梁存在的情况下,可近似地计算悬索桥的变形和内力.

关键词: 重力刚度, 悬索桥, 刚度