摘要
通过对沙漠地区大风气候下典型低矮房屋的表面风压进行原型实测,发现其风压原始实测数据存在异常现象,指出了这种现象的主要影响因素为参考静压和高差压.本文研究了实测风压数据的修正方法,即先对屋面风压进行高差压修正,再对其整体风压进行基于风洞试验体型系数的修正.其中体型系数修正值采用最小二乘法或绝对值误差法进行确定,进而分别得到屋面和不同楼层墙面的风压修正值.利用修正后的实测各测点体型系数分别计算沙漠地貌下低矮建筑屋面和墙面的风荷载体型系数,并与风洞试验计算结果以及现行荷载规范中封闭式双坡屋面房屋的经验设计值相比较,表明修正后结果的合理性和准确性;发现实测场地条件下各个面的体型系数计算结果都出现了与规范取值过于接近的情况,并且有侧墙面和背风屋面的实测结果偏大,超出了规范推荐值的情形.该风压修正方法改善了现场实测中原始数据的失真和缺失的问题,更为后续低矮建筑风压以及风沙压力特征规律的进一步研究奠定了基础.
In a full scale field measurement of the surface wind pressure of a typical low rise building in the desert area under the gale climate, abnormal surface wind pressure statistics is observed.Through further investigation we find that the main reasons for such abnormality are the reference static pressure and pressure differences caused by height.In this paper, a correction method of abnormal surface wind pressure data is proposed.In particular, we first correct the roof wind pressure error caused by height differences.Then we correct the overall wind pressure, basing on the data from a wind tunnel test using scale model.In the first stage, we revise the shape coefficients of each measuring point’s in the full scale measurement, cased on wind tunnel test data.The revised shape coefficients are determined by the least square method or the absolute value error method.In the second stage, we correct the abnormal surface wind pressure based on these revised shape coefficients.After correction, we compare our corrected results in full scale measurement with the wind tunnel test outcome as well as the design value in the Load code for the design of building structures(GB 50009-2012).The results from three parts are consistent with each other, which validates our correction method.However, from revised full scale measurement results, we show that the design value of the GB 50009-2012 may be underestimated and need more careful investigation.In general, our correction method for abnormal measured surface wind pressure can help solve the inaccurate and missing data issue that often occur in field measurements.With the support of our method, more studies using filed measured wind pressure data can be carried out.
作者
丛顺
李正农
刘增夕
陈策
CONG Shun;LI Zhengnong;LIU Zengxi;CHEN Ce(China Construction Fourth Engineering Division Corp.Lud.,Guangzhou 510665,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Hunan University,Changsha 410082,China;College of Civil Architecture,University of Jinan,Jinan 250022,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2022年第4期918-935,共18页
Journal of Basic Science and Engineering
基金
国家自然科学基金项目(51478179,51678233)。
关键词
沙漠地区
低矮建筑
原型实测
风洞试验
体型系数
风压修正
最小二乘法
绝对值误差法
desert area
low-rise buildings
prototype measurement
wind tunnel test
shape coefficient
wind pressure correction
least square method
absolute error method
