For the derrick and its components with initial deformation, this method use Fourier series or simplify the equation to a half-wave sine curve for denoting the random initial deformation curve.
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- 該方法是對于有任意初始變形的井架桿件或井架整體；可以用傅里葉級數來(lái)表示任意初始變形曲線(xiàn)；或簡(jiǎn)化成一個(gè)半波的正弦曲線(xiàn)；并結合實(shí)測變形數據；評定井架承載能力.
