| 大型双曲冷却塔表面脉动风压随机特性——风压极值探讨 |
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| 引用本文： | 柯世堂,赵林,葛耀君.大型双曲冷却塔表面脉动风压随机特性——风压极值探讨[J].实验流体力学,2010,24(4). |
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| 作者姓名： | 柯世堂 赵林 葛耀君 |
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| 作者单位： | 同济大学土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金，科技部重大科技项目 |
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| 摘 要： | 针对风压信号呈现的非高斯特性和传统极限估计方法的局限,首次提出基于保证率和相关性的极值估计方法--全概率迭代法进行冷却塔表面脉动风荷载极值分析,并和传统的峰值因子法及改进的Sadek-Simiu法计算结果进行对比验证.结果表明:全概率迭代法避开了对随机过程的高斯分布假定,相比传统的极值估计方法其结果更加真实可靠;表达风压极值中脉动分量的峰值因子数值沿着环向和子午向变化显著,如取为同一数值则偏于危险或过于保守;采用全概率迭代法得到的表面风压系数极值分布曲线与规范取值相比,迎风面和负压峰值区域极值偏小,背风区域极值偏大,且最小值对应角度相差约10°.
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| 关 键 词： | 峰值因子法 Sadek-Simiu法 全概率迭代法 峰值因子 关系数 极值风压 冷却塔 |
Features of fluctuating wind pressure on large hyperbolic cooling tower: discussions on extreme wind pressure |
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| KE Shi-tang,ZHAO Lin,GE Yao-jun.Features of fluctuating wind pressure on large hyperbolic cooling tower: discussions on extreme wind pressure[J].Experiments and Measur in Fluid Mechanics,2010,24(4). |
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| Authors: | KE Shi-tang ZHAO Lin GE Yao-jun |
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| Institution: | KE Shi-tang,ZHAO Lin,GE Yao-jun(State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China) |
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| Abstract: | Peak factor method and Sadek-Simiu method based on Gauss distribution are introduced in detail,the method of estimating extreme value based on reliability theory is potimized,and the total probability convergence method which is applied for single sample is proposed.The results of pressure test for ultra large-scale cooling tower calculated by these methods are discussed.The analysis results show that the total probability convergence method avoids the assumption of Gauss distribution and can gain better re... |
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| Keywords: | peak factor method Sadek-Simiu method total probability convergence method peak factor related coefficient extreme wind pressure cooling tower |
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