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中文摘要：
研究了某塔式起重机金属结构,在其最危险工况下,考虑疲劳累积损伤的时变可靠性分析。以载荷增量最小准则得到研究塔机的最危险工况及相应的失效模式,通过瞬态分析模拟塔式起重机的起升和回转动作获取关键单元的应力-时间历程,并应用雨流计数法统计得到关键单元的应力变程和相应循环次数。根据材料的S-N曲线方程,由Miner准则计算得到其累积损伤度,最后应用蒙特卡洛法进行可靠度的计算。
英文摘要：
The paper describes the research on the metal structure of certain tower crane, and analyzes the time-varying reliability with the cumulative fatigue damage under the most dangerous working condition. The most dangerous case of the tower crane under study and its corresponding failure mode are gained via the minimum load increment criterion. The transient analysis is performed to simulate lifting and slewing actions of the tower crane in order to get the stress-time history of the critical element. The rain-flow counting method is used to get the stress range and corresponding number of cycles of the critical element. According to the S - N curvilinear equation, the accumulative damage degree is calculated through the Miner rule. Furthermore, the reliability calculation is performed with the Monte Carlo method.
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