摘要
评估结构的疲劳损伤是压型金属屋面系统抗风设计的重要环节,为了研究压型金属屋面支座节点的风致疲劳性能,对270°锁边支座和扣合支座开展“檩条-支座-压型钢板”局部模型的疲劳试验,得到不同应力幅值下支座节点的疲劳寿命曲线(S-N曲线)。基于Matlab模拟脉动风荷载时程数据,采用ABAQUS建立压型金属板屋面系统的数值分析模型,并开展风振响应分析;通过雨流计数法统计支座节点的应力循环数,并基于Miner疲劳线性累计损伤理论,得到锁边支座和扣合支座在不同工况下的疲劳损伤值,进而揭示压型金属板屋面系统的疲劳损伤规律。研究结果表明:压型金属板屋面系统支座节点的疲劳损伤不仅与基本风压相关,也与风荷载体型系数不同的屋面区域存在相关性;同等工况下扣合支座相较于270°锁边支座更易发生风致疲劳破坏。
Assessing the fatigue damage of structures is a crucial aspect in the wind resistance design of profiled metal roof system.In order to investigate the wind-induced fatigue performance of clip connections of the profiled metal roof,the fatigue test is conducted on the local model of‘purlin-clip-profiled steel plate’for 270°seam clips and button clips,and the fatigue life curves(S-N curves)of clip connections under different stress amplitudes are obtained.On basis of fluctuating wind load time-history data simulated by Matlab,the numerical analysis model of the profiled metal roofing systems is established using ABAQUS.And the wind-induced vibration response analysis is conducted.The number of stress cycles of the bearing joints is counted by the rain flow counting method.Based on Miner’s linear cumulative damage theory,the fatigue damage values of seam clips and button clips under various working conditions are determined,and the fatigue damage law of the profiled metal roofing system is revealed.The results indicate that the fatigue damage of clip connections of profiled metal roofing system is not only correlated with the basic wind pressure,but also with roof areas characterized by different wind load drag coefficients.Under identical working conditions,the buckled support is more susceptible to wind-induced fatigue failure compared to 270°locking support.
作者
吴函恒
陶梦龙
涂庭婷
隋璐
Wu Hanheng;Tao Menglong;Tu Tingting;Sui Lu(School of Civil Engineering,Chang’an University,Xi’an 710061,China)
出处
《建筑科学》
北大核心
2025年第7期12-21,共10页
Building Science
基金
陕西省自然科学基金项目(2023-JC-YB-295)
中央高校基本科研业务费资助项目(300102282204,300102282718)。
关键词
压型金属板屋面
支座节点
风致疲劳
常幅疲劳试验
profiled metal sheet roof
clip connection
wind-induced fatigue
constant amplitude fatigue test
