CN111104738A - 围护结构基本风速的计算方法 - Google Patents

围护结构基本风速的计算方法 Download PDF

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CN111104738A
CN111104738A CN201911293440.XA CN201911293440A CN111104738A CN 111104738 A CN111104738 A CN 111104738A CN 201911293440 A CN201911293440 A CN 201911293440A CN 111104738 A CN111104738 A CN 111104738A
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纪鹏远
邸小坛
曾兵
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China Academy of Building Research CABR
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Abstract

本发明涉及一种围护结构基本风速的计算方法,属于土木工程分析计算技术领域。计算方法如下:第一步,采用自记式风速仪记录的10m高度处3s瞬时风速资料作为基本风速数据;第二步,风速的统计样本应采用年最大值,并采用极值Ⅰ型分布的概率分布;第三步,选用0.99分位值的风速和已出现最大风速中的大值作为围护结构的基本风速。采用本发明的方法有效解决了设计中已出现的风速大于计算所得的基本风速的问题,提高了风速设计的准确性。具有广泛的应用前景。

Description

围护结构基本风速的计算方法
技术领域
本发明涉及一种计算方法,特别是一种围护结构基本风速的计算方法,属于土木工程分析计算技术领域。
背景技术
围护结构指围合建筑空间四周的墙体、门、窗等,能够有效地抵御不利环境的影响。而基本风速又称参考风速、标准风速。空旷平坦地面或海面以上规定标准高度处的规定时距和重现期的年平均最大风速。结构物抗风设计的基准风速。可由现场实测风速资料推算或利用气象站风速观测资料进行统计分析得出。多数国家采用10m为标准高度,10min为标准时距,重现期则依结构物及其重要性不同取为30~150年不等。我国目前对于围护结构基本风速的计算方法选用0.98分位值的风速,但这种方法对于一些地区,该方法可能会出现已出现的风速大于计算所得的基本风速的情况。
发明内容
为了克服现有技术的上述问题,本发明提出了一种围护结构基本风速的计算方法,用以解决已出现的风速大于计算所得的基本风速的问题。
为解决上述技术问题,本发明所采取的技术方案是:
围护结构基本风速的计算方法,其计算方法如下:
第一步,采用自记式风速仪记录的10m高度处3s瞬时风速资料作为基本风速数据;
第二步,风速的统计样本应采用年最大值,并采用极值I型分布的概率分布,其分布函数应为:
FI=exp{-exp[-α(x-u)]}
Figure BDA0002319762320000011
Figure BDA0002319762320000012
式中:x—年最大风速;
u—分布的位置参数,即其分布的众值;
α—分布的尺度参数;
σ—样本的标准差;
μ—样本的平均值。
当由有限样本n的均值
Figure BDA0002319762320000013
和标准差σ1作为μ和σ的近似估计时,分布参数u和α应按下列公式计算:
Figure BDA0002319762320000021
Figure BDA0002319762320000022
其中C1和C2的取值见现行《建筑结构荷载规范》中的相关规定;
第三步,选用0.99分位值的风速和已出现最大风速中的大值作为围护结构的基本风速,0.99分位值的风速可按下式确定:
Figure BDA0002319762320000023
对于现有技术,本发明具有如下技术效果:
采用本发明的围护结构基本风速的计算方法,有效解决了设计中已出现的风速大于计算所得的基本风速的问题,提高了风速设计的准确性。具有广泛的应用前景。
具体实施方式
下面对本发明的具体实施方式作进一步详细说明。
本发明的围护结构基本风速的计算方法,其计算方法如下:
第一步,采用自记式风速仪记录的10m高度处3s瞬时风速资料作为基本风速数据;
第二步,风速的统计样本应采用年最大值,并采用极值I型分布的概率分布,其分布函数应为:
FI=exp{-exp[-α(x-u)]}
Figure BDA0002319762320000024
Figure BDA0002319762320000025
式中:x—年最大风速;
u—分布的位置参数,即其分布的众值;
α—分布的尺度参数;
σ—样本的标准差;
μ—样本的平均值。
当由有限样本n的均值
Figure BDA0002319762320000027
和标准差σ1作为μ和σ的近似估计时,分布参数u和α应按下列公式计算:
Figure BDA0002319762320000026
Figure BDA0002319762320000031
其中C1和C2的取值见现行《建筑结构荷载规范》中的相关规定;
第三步,选用0.99分位值的风速和已出现最大风速中的大值作为围护结构的基本风速,0.99分位值的风速可按下式确定:
Figure BDA0002319762320000032
上述实施例只是为了更清楚说明本发明的技术方案做出的列举,并非对本发明的限定,本领域的普通技术人员根据本领域的公知常识对本申请技术方案的变通亦均在本申请保护范围之内,总之,上述实施例仅为列举,本申请的保护范围以所附权利要求书范围为准。

Claims (1)

1.围护结构基本风速的计算方法,其特征在于,计算方法如下:
第一步,采用自记式风速仪记录的10m高度处3s瞬时风速资料作为基本风速数据;
第二步,风速的统计样本应采用年最大值,并采用极值I型分布的概率分布,其分布函数为:
FI=exp{-exp[-α(x-u)]}
Figure FDA0002319762310000011
Figure FDA0002319762310000012
式中:x—年最大风速;
u—分布的位置参数,即其分布的众值;
α—分布的尺度参数;
σ—样本的标准差;
μ—样本的平均值;
当由有限样本n的均值
Figure FDA0002319762310000013
和标准差σ1作为μ和σ的近似估计时,分布参数u和α应按下列公式计算:
Figure FDA0002319762310000014
Figure FDA0002319762310000015
其中C1和C2的取值见现行《建筑结构荷载规范》中的相关规定;
第三步,选用0.99分位值的风速或已出现最大风速中的大值作为围护结构的基本风速,0.99分位值的风速可按下式确定:
Figure FDA0002319762310000016
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CN107092794A (zh) * 2017-04-25 2017-08-25 广东电网有限责任公司电力科学研究院 用于台风混合气候地区极值风速估算的分析方法及装置
CN107491579A (zh) * 2017-06-30 2017-12-19 中国电力科学研究院 一种输电线路覆冰厚度及风速的联合概率计算方法及系统
EP3480455A1 (en) * 2016-07-04 2019-05-08 The Japan Steel Works, Ltd. Wind turbine monitoring device, wind turbine monitoring method, wind turbine monitoring program, and storage medium
CN109740195A (zh) * 2018-12-13 2019-05-10 宁波市电力设计院有限公司 一种基于气象站观测数据的极值台风风速概率分布模型及设计台风风速的评估方法
CN110334406A (zh) * 2019-06-11 2019-10-15 中国能源建设集团江苏省电力设计院有限公司 一种考虑风速特大值的极值风速重现期确定方法和装置

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EP3480455A1 (en) * 2016-07-04 2019-05-08 The Japan Steel Works, Ltd. Wind turbine monitoring device, wind turbine monitoring method, wind turbine monitoring program, and storage medium
CN107092794A (zh) * 2017-04-25 2017-08-25 广东电网有限责任公司电力科学研究院 用于台风混合气候地区极值风速估算的分析方法及装置
CN107491579A (zh) * 2017-06-30 2017-12-19 中国电力科学研究院 一种输电线路覆冰厚度及风速的联合概率计算方法及系统
CN109740195A (zh) * 2018-12-13 2019-05-10 宁波市电力设计院有限公司 一种基于气象站观测数据的极值台风风速概率分布模型及设计台风风速的评估方法
CN110334406A (zh) * 2019-06-11 2019-10-15 中国能源建设集团江苏省电力设计院有限公司 一种考虑风速特大值的极值风速重现期确定方法和装置

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