其总体失稳临界载荷计算是设计中的一个重要问题。
The critical load calculating of its general instability is an important problem in design.
而载荷计算和强度分析对于风力机的设计来说是非常重要的基础性工作。
But the load calculation and intensity analysis are very important basic work for HAWT design.
由于在焊缝部位存在焊接缺陷，采用传统的建立在构件无缺陷、无裂纹基础上的强度理论进行设计计算时，往往不能确保起重机在额定载荷下使用的安全性。
Since there are weld defects in welds, using traditional strength theory based on no defect and no crack to design, crane's security in rating load can't be insured.
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