| 引用本文: | 李英民,宋维举,王肖巍,徐军.薄膜结构抗风性能概率评估方法[J].哈尔滨工业大学学报,2018,50(12):107.DOI:10.11918/j.issn.0367-6234.20181214 |
| LI Yingmin,SONG Weiju,WANG Xiaowei,XU Jun.Probabilistic assessment on wind resistant performance of membrane structures[J].Journal of Harbin Institute of Technology,2018,50(12):107.DOI:10.11918/j.issn.0367-6234.20181214 |
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| 摘要: |
| 为研究薄膜屋盖结构不同抗风需求的超越概率评估方法,以重庆地区为例,借鉴PEER基于性能的抗震设计方法,考虑风场随机性,统计重庆地区近十年每月最大风速样本概率分布特征,获得由多项式拟合的设计风速危险性曲线.用Davenport谱表示水平风速谱,推导出风速谱危险性曲线,并用五次多项式进行拟合.考虑薄膜屋盖结构的非线性特征,近似将屋盖结构抗风需求（竖向位移限值）的平均值与风速谱值关系采用幂函数表示,推导出薄膜屋盖结构风载下不同法向变形需求值的年平均超越概率表达式.以平坦薄膜屋盖为例,采用自回归模型的线性滤波器法(AR法)模拟生成30条对应不同风压的脉动风速时程,对屋盖进行动力响应分析,通过计算,获得不同变形需求下薄膜屋盖风振响应的超越概率及最大响应重现期.结果表明:多项式拟合对于薄膜屋盖抗风需求的年平均超越概率表达式推导有较好的简化效果；基于性能的薄膜屋盖结构抗风概率评估方法通过少量结构分析可以得到结构不同位移需求的超越概率评估值. |
| 关键词: 薄膜屋盖结构 概率评估 抗风设计 闭式表达式 风速谱危险性曲线 |
| DOI：10.11918/j.issn.0367-6234.20181214 |
| 分类号:TU375 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51478067)； 重庆市教委科学技术研究项目(KJ1723378) |
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| Probabilistic assessment on wind resistant performance of membrane structures |
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LI Yingmin1,2,SONG Weiju1,WANG Xiaowei1,XU Jun1
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(1.School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2.Key Lab of New Technology for Construction of Cities in Mountainous Area (Chongqing University), Ministry of Education, Chongqing 400045, China)
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| Abstract: |
| To study different wind demand exceeding probability assessment of the membrane roof, Chongqing was taken as an example. Taking PEER performance-based seismic design method as reference and considering the randomness of wind field, the probability distribution characteristics of monthly maximum wind speed samples in recent ten years were calculated, and the designed maximum wind speed risk curve was obtained by polynomial fitting. The horizontal wind speed spectrum was represented by Davenport spectrum. The nonlinear characteristics of membrane roof structure were considered, and the relationship between resistance requirements (vertical displacement limit) and the average wind speed spectrum values was approximately represented by a power function. The expression of the mean annual frequency of exceedance for displacement demand was derived. A flat membrane roof was taken as an example, 30 pulsating wind speed time intervals were generated with the AR method, and structural response analysis was carried out. Through calculation, the transcendental probability and recurrence interval corresponding to different performance levels of the roof were obtained. The results show that polynomial fitting has a better effect on the derivation of the expression of annual average exceeding probability. Performance-based wind resistance probabilistic evaluation method for membrane roofs can obtain the transcendental probabilistic evaluation values of different displacement requirements of structures through a small number of structural analyses. |
| Key words: membrane roof probabilistic evaluation anti-wind design closed-form expression velocity spectrum hazard curve |
