鉴于渡河桥梁结构必须具备重复使用的特点，其设计范围仅涉及弹性理念，因此必须对服役渡河桥梁装备结构的弹性失效进行预测。
With the elastic scope of design for bridge and pontoon structures which are used continually, it is necessary for the structures to be forecasted when their elasticity is invalid.
在对重复压裂井进行产能评价时，常常认为初次压裂形成的裂缝完全失效，这种考虑与实际情况是不相符合的，导致对重复压裂井的产能预测有很大的误差。
When estimating productivity of refractured well, the primary fracture is considered to be disabled and it is not coincident with actual facts and a great error of prediction result exists.
由于重复压裂气井原有裂缝的失效程度难以评价，导致重复压裂气井的产能预测常常有很大的误差。
It is difficult to evaluate the failure extent of previous fractures in refractured gas Wells, which results in a big error in productivity prediction.
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