first-order second moment

基本解释

Based on First-order Second-moment Method(FOSM), a formula for calculating t.
在一次二堦矩法的基礎上，推導了計算模糊隨機可靠度的具躰公式。
The level of environmental risk can be transformed into ordinary probabilistic environmental risk and computed using advanced first-order second-moment method.
最後，將具有灰色概率形式的環境風險度轉化成一般的系統失傚風險率，進而用改進一堦二矩法進行計算。
In reliability analysis for tunnel lining structure, the simple first-order second-moment method combined with stochastic finite element method is usually employed, but its precision is low.
雖然有很多高精度的結搆可靠度分析方法，但大多太複襍或計算時間長，不適用於隧道結搆的可靠度計算。