基于实测的低矮房屋屋面风压极值计算方法

发布时间：2018-01-03 13:42

本文关键词：基于实测的低矮房屋屋面风压极值计算方法　出处：《西南交通大学学报》2014年02期 　论文类型：期刊论文

【摘要】：探讨了低矮房屋实测风压的极值计算方法,以便为建筑抗风设计提供重要依据.基于同济大学土木工程防灾国家重点实验室在上海浦东国际机场附近海岸边建造的风工程实测基地(包括一栋坡角连续可调的低矮试验房和高分别为10和40 m的测风塔)的现场实测数据,分析了良态气候条件下低矮房屋表面风压的分布特性,并探讨了由短时距样本估计长时距下极值的计算方法对实测风压极值估计的可靠性.研究表明:屋面来流分离区实测风压表现出明显的非高斯性,其概率分布与Gamma分布和对数正态分布符合较好;将屋盖风压时程划分成若干子段时,利用极值Ⅰ型分布参数转换关系计算风压极值,估计极值比观察极值法的结果更准确,且最佳观察时距可由自相关分析确定;以该最佳观察时距划分单个子段风压样本,实测观察极值基本服从极值Ⅰ型分布,估计极值能较准确地给出实测时程极值,表明基于极值I型的短时距极值估计方法合理、有效.
[Abstract]:The method of calculating the extreme value of the measured wind pressure in low buildings is discussed. Based on the State key Laboratory of Civil Engineering disaster Prevention of Tongji University, located near the coast of Pudong International Airport in Shanghai (. The field measured data include a low-rise test room with continuously adjustable slope angle and a wind tower with a height of 10 m and 40 m respectively. The distribution characteristics of wind pressure on the surface of low-rise buildings under good weather conditions are analyzed. The reliability of the method for estimating the extreme value of the measured wind pressure from the short-distance samples is discussed. The results show that the measured wind pressure in the roof flow separation area is obviously non-#china_person0#. The probability distribution is in good agreement with Gamma distribution and logarithmic normal distribution. When the roof wind pressure time history is divided into several subsections, the extreme value of wind pressure is calculated by using the conversion relation of extreme distribution parameters, and the estimation of extreme value is more accurate than that of observing extreme value method. The best observation time distance can be determined by autocorrelation analysis. According to the best observation time interval, the wind pressure samples of a single sub-section are divided. The observed extreme values are basically distributed according to the type I extreme values, and the estimated extreme values can give the measured time history extreme values more accurately. It is shown that the method of estimating the extreme value of short-time distance based on type I extremum is reasonable and effective.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金资助项目(51178352,51378396)
【分类号】：TU312
【正文快照】： 多次风灾调查表明,低矮房屋的损毁往往始于围护结构尤其是屋盖的破坏,而风荷载的极值常常是研究局部风压的关键,因此,准确、合理估算低矮房屋表面极值风压对减轻低矮房屋风致破坏具有重要意义.目前,国内外常用的风压极值计算方法有观察极值法、Davenport法(峰值因子法)[1]、Ko

【参考文献】