Based on the small-deflection elastic theory and some simplified assumptions, the initial stiffness, the slack stiffness and the critical slack load have been derived theoretically.

首先应用小挠度弹性理论，在一些合理简化假设的基础上，推导自平衡索桁架的初始刚度、松弛刚度及临界松弛荷载公式。

youdao

MacDonald notes that the deck's truss bears the bulk of the bridge's load, while the cables appear slack compared with those of other Bridges.

MacDonald称桥面的桁架支撑着整座桥大部分的重量，相对于其他的桥梁，日晷桥的缆索略显松弛。

youdao

So, the problem of reactive power constrains of generator at slack bus should be considered when calculating the load margin and critical voltage by using the method of continuation power flow.

因此，在应用连续潮流法计算负荷裕度和临界电压时应考虑平衡节点发电机无功约束问题。

youdao