岸桥起重机随机风振疲劳可靠性分析

基于时域方法研究岸桥起重机的风振疲劳可靠性问题。采用谐波叠加法给出了符合Davenport风速谱的多维脉动风速时间历程，基于Bernoulli方程得到相应的风压时间历程，并将相应的风压荷载作用于有限元模型，采用雨流计数法处理结构关键点的应力响应。基于疲劳失效的Basquin方程、Miner线性累积损伤准则和Goodman平均应力修正方程导出疲劳累积损伤的概率模型。考虑平均风速的概率分布，提出了基于概率累积损伤机制的风振疲劳可靠度和可靠性寿命计算方法，为岸桥起重机的风振疲劳可靠性分析作了一些有益的探索和研究。

Reliability Analysis on Wind-induced Stochastic Fatigue for Quayside Container Crane

Wind-induced stochastic fatigue reliability analysis for quayside container cranes is conducted using time domain method. Multi-dimensional fluctuating wind velocity time-histories which fit Davenport power spectrum and spatial correlations are simulated using WAWS (weighted amplitude wave superposition) method. The corresponding wind pressure time-histories are subsequently obtained based on Bernoulli equation and are then exerted on FEM model of quayside container crane to carry out wind-induced vibration time-history analysis. The wind-induced stress time-histories are analyzed using rain flow counting method to establish the fatigue characteristics of stress data. A methodology for probabilistic modeling of fatigue damage accumulation is developed using Miner failure criterion, Basquin equations and Goodman''s method. Considering the wind speed probability distribution, the proposed probabilistic fatigue accumulative damage model is then applied for the reliability assessment and reliable fatigue life calculation for quayside container crane under stochastic wind loading, which will be beneficial to wind-induced stochastic fatigue reliability analysis for quayside container cranes.