In consideration of the randomness of elastic restraint stiffeness and both cable stiffeness and cable pretension, the general formulas for analyzing random internal forces of the prestressed steel truss by perturbation methed are obtained.

• 考虑到弹性约束刚度、拉索刚度和预拉力的随机性，进一步得到了随机参数预应力钢架随机内力摄动分析的一般公式。