考虑台风效应的金属屋面系统全寿命期疲劳损伤估计  

FATIGUE DAMAGE ESTIMATION OF METAL ROOFING SYSTEM IN WHOLE LIFE PERIOD CONSIDERING TYPHOON EFFECT

作　　者：宣颖 张乐乐 谢壮宁[1] XUAN Ying;ZHANG Le-le;XIE Zhuang-ning(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China;China Construction Second Engineering Bureau Co.,Ltd.,South China Company,Shenzhen 518048,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广州510640 [2]中国建筑第二工程局有限公司华南公司,深圳518048

出　　处：《工程力学》2025年第1期189-198,共10页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51778243);广东省现代土木工程技术重点实验室资助项目(2021B1212040003)。

摘　　要：评估金属屋面设计使用寿命年限内的累积损伤程度是抗风设计的重要环节,该文提出一种用于台风多发区域金属屋面系统全寿命期风致疲劳损伤的估计方法,该方法结合风洞测压试验数据和基于台风MonteCarlo模拟所得风速风向分布模型,采用有限元数值模拟方法进行荷载应力分析,提取金属屋面板块疲劳热点处荷载应力关系,从而获得应力时程数据,通过雨流计数法统计应力循环数,并根据Goodman应力修正法则和Miner疲劳线性累积损伤理论,计算得到金属屋面系统在全寿命期的疲劳累积损伤情况;利用台风等效序列进行加载,以动态物理压力箱试验验证数值模拟方法有效性为基础,将该文方法应用于位于东南沿海的某大跨度圆柱形金属屋面的疲劳累积损伤估计。结果显示:金属屋面全寿命期风致疲劳损伤不仅与风压分布存在一定相关性,也与建筑物所在地区的极值风速分布和主导风向存在相关性,评估全寿命期风致疲劳损伤应结合风洞测压试验结果和建筑物所在地风速风向分布模型进行综合分析;对于更易出现疲劳破坏的屋面角区和边缘部位的高负压区域,量化分析局部加密角区和边缘部位檩距对风致疲劳损伤的影响。Assessing the cumulative damage level of metal roof design within its expected service life is an important aspect of wind-resistant design.This paper proposes an estimation method for wind-induced fatigue damage throughout the entire service life of a metal roof system in typhoon-prone areas.This method uses wind tunnel test data and a model for wind speed and direction distribution based on Monte Carlo simulation of typhoons.By using the finite element numerical simulation method for load stress analysis,the stress-load relationship at the fatigue hot spot of the metal roof panel is extracted,and stress time series data is obtained.The stress cycle number is calculated by rain flow counting method.Then,according to the Goodman stress correction rule and the Miner fatigue linear cumulative damage theory,the cumulative fatigue damage of the metal roof system during its entire service life is calculated.The validity of the numerical simulation method is verified by dynamic physical pressure box testing using typhoon equivalent sequences.Based on this,the proposed method is applied to estimate the fatigue cumulative damage of a large-span cylindrical metal roof located in the southeast coastal area.The results show that the wind-induced fatigue damage of metal roofs throughout their service life is not only correlated with the distribution of wind pressure,but also with the distribution of extreme wind speeds and dominant wind directions in the region where the building is located.To evaluate the wind-induced fatigue damage throughout the service life,it is necessary to conduct a comprehensive analysis based on the wind tunnel test results as well as the wind speed and direction distribution model of the building location.For the high negative pressure areas in the roof corner and edge regions that are more prone to fatigue failure,the quantitative analysis of the effect of local densification of the corner and edge purlin spacing on wind-induced fatigue damage should be carried out.

关 键 词：金属屋面板 有限元分析 风洞试验 风致疲劳损伤 台风模型 

分 类 号：TU312.1[建筑科学—结构工程] TU352.2