本文介绍了塔式起重机钢结构安全寿命评估中的应力幅及应力幅谱系数的计算方法和过程。
This paper describes the calculation method and process of stress amplitude and stress amplitude spectrum to evaluate the safety life time of steel structure for tower crane.
将安全系数增强一倍的设计理念，令设备安全使用寿命更加延长。
Strengthens a time of design idea the safety coefficient, Makes the equipment safety handling life even more to lengthen.
本文指出，根据有限寿命疲劳强度安全系数法设计出的零件仍然有可能屈服失效。作者建议用寿命计算法和图解估值法代替现有的安全系数法。
This paper indicates that the components, which are designed according to the safety factor method of fatigue strength for the finite life, can also be yielded.
在分析产生上述问题的基础上，采取轴体防断措施，并对马达进行了改进，大幅度提高了动力钻具的使用寿命及安全系数。
Based on the analysis of failures, measures were taken to protect shaft body from break, prolong motor life and improve safety factors.
在分析产生上述问题的基础上，采取轴体防断措施，并对马达进行了改进，大幅度提高了动力钻具的使用寿命及安全系数。
Based on the analysis of failures, measures were taken to protect shaft body from break, prolong motor life and improve safety factors.
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