浮桥通载时吃水变化对锚纲张力和浮桥临界流速的影响

为了分析通载浮桥吃水改变和水阻力增加而导致锚纲张力改变的规律,以及锚纲张力引起桥脚舟绕浮心艏倾后降低浮桥动水稳定性的现象.利用经验公式计算了浮桥通载时吃水改变量对锚纲张力的影响,并采用等效偏心距方法计算了浮桥考虑艏倾时的临界流速.得出浮桥通载后吃水增加和水阻力增加将使锚纲张力大幅增加而浮桥临界流速略有降低的结论.同时,提出了浮桥在大流速下安全使用的若干措施.

Influence of draft change of floating bridge with vehicles on tension of anchor -cable and critical velocity of flow

To investigate variation of the mooring forces caused by increasing sea gauge and resistance of water, when there are vehicles on floating bridge, an experiential formula was adopted to calculate the effect on the mooring force. And taking roll into account, critical velocity of flow was evaluated. The study conclude that the increase of sea gauge and resistance of water increase mooring forces and reduce critical velocity of flow. And then, some measures were presented for the safety of floating bridges on larger rivers.