Fictive force will be proved to be the liquid force under bending state of pipe string in the paper,and its characteristic will be analysed.

• 文中将证明“虚力”是管柱在弯曲状态下的流体作用力,并对其特点进行分析,以便为封隔器管柱受力分析计算奠定严密的科学基础。