Under external loads,the under suspended part of a suspension structure may be levitated and some of the slings,which are hung from the main cable to support the under suspended part,may be relaxed.

• 悬索结构在外激励作用下,下部悬挂结构可能会发生飘浮,以致连接主索与下部结构的吊索部分产生松弛。