根据可靠性理论基础，阐述了井架可靠度的基本概念。
On basis of the reliability theory, the basic concept of derrick reliability is expounded.
可靠性理论中，可靠度函数及其反函数通常都是未知的，需要依据样本进行估计。
In the reliability theory, reliability function and its inverse function are usually unknown and need to be estimated by using sample.
根据断裂力学及可靠性理论，提出了一种起重机焊接箱形梁存在裂纹缺陷的可靠度计算方法。
Based on fracture mechanics and theory of reliability, this paper offers the reliability calculation method for welded box beam having fracture.
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