基于名义应力法的工业钢烟囱风致疲劳损伤评估  

Wind-induced Fatigue Damage Assessment of Industrial Steel Chimney Based on Nominal Stress Method

作　　者：史佩武 SHI Pei-wu(Jiangsu Province Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou Jiangsu 215011 China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011

出　　处：《江苏建筑》2020年第2期32-37,共6页Jiangsu Construction

摘　　要：文章基于名义应力法对某工业钢烟囱的风致疲劳安全性能进行了研究,并对于该钢烟囱的风振响应开展了分析。首先,运用通用有限元软件ANSYS建立了工业钢烟囱的杆系模型,并验证杆系模型的可靠性。然后,基于谐波叠加法进行了风速时程的模拟,并考虑钢烟囱所在地实际风速风向联合分布特性对风致疲劳损伤分析的影响。最后,通过雨流计数法、Goodman应力修正、S-N曲线和Pelmgren-miner线性累积损伤理论,并运用名义应力法对工业钢烟囱的顺风向和横风向进行疲劳损伤评估。结果表明,使用名义应力法仅考虑横风向作用时的疲劳寿命为11.1年,横风向和顺风向共同作用时的疲劳寿命为9.09年,工业钢烟囱报告中实际出现裂纹的时间为4年,计算的疲劳寿命与实际裂纹出现时间接近。Based on the nominal stress method,this paper studies the wind-induced fatigue safety performance of an industrial steel chimney,and analyzes the wind-induced vibration response of the steel chimney.Firstly,the general finite element software ANSYS is used to establish the model of industrial steel chimney and verify the reliability of the model.Then,the time history of wind speed is simulated based on the harmonic superposition method,and the influence of the joint distribution of wind speed and direction on the analysis of wind-induced fatigue damage is considered.Finally,through the rain flow counting method,Goodman stress correction,S-N curve and pelmgren Miner linear cumulative damage theory,and using the nominal stress method to evaluate the downwind and crosswind fatigue damage of industrial steel chimney.The results show that the fatigue life is 11.1 years when the nominal stress method is used,9.09 years when the cross wind direction and the along wind direction act together,and 4 years when the cracks actually appear in the industrial steel chimney report.The calculated fatigue life is close to the actual crack occurrence time.

关 键 词：名义应力法 杆系模型 风致振动 工业钢烟囱 

分 类 号：TU312.1[建筑科学—结构工程]