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风荷载是高层建筑围护结构设计的主要控制荷载。中国《建筑结构荷载规范》(GB 50009—2012)给出了单体矩形截面高层建筑围护结构的设计风荷载,其中迎风面正压与分离区负压都随着建筑高度的增大而增大,这与近地面钝体结流的机理不符。通过与欧洲规范EN 1991-1-4、美国规范ASCE 7-10、澳大利亚/新西兰规范AS/NZS 1170.2∶2011、加拿大规范NBC 2005、日本规范AIJ 2004等主要国外规范进行比较,发现主要国外规范仅给出了极值负压的最大值,而没有给出极值负压的分布。接着基于某项目风洞试验与中国规范GB 50009—2012的比较,发现高层建筑极值负压最大值一般发生在建筑中下部区域,并指出当前工程上采用的中国规范GB 50009—2012与风洞试验包络设计方法是不经济的。最后基于奥雅纳多年的风工程应用经验,对幕墙结构风荷载取值给出了一些建议,并特别强调风洞试验报告只有经独立于风洞试验单位的风专家审核后才可用于实际工程设计。
Wind load is the main control load of high-rise building envelope design. China’s “Code for Load of Building Structures” (GB 50009-2012) gives the design wind load of the envelope of high-rise building with single rectangular cross-section. Positive pressure on the windward side and negative pressure in the separation area increase with the height of the building Large, which is inconsistent with the mechanism of blunt body near ground knot. Comparisons were made with major foreign codes such as the European Code EN 1991-1-4, the U.S. Code ASCE 7-10, the Australian / New Zealand Code AS / NZS 1170.2: 2011, the Canadian Code NBC 2005 and the Japanese Code AIJ 2004 and found that the major foreign codes The maximum value of the negative pressure is given, without giving the distribution of the extreme negative pressure. Then based on a project wind tunnel test and the Chinese standard GB 50009-2012 comparison found that the maximum value of high-rise building extreme negative pressure generally occurs in the lower area of the building and pointed out that the current project using the Chinese standard GB 50009-2012 and wind tunnel The experimental envelope design approach is uneconomical. Finally, based on the years of experience in wind engineering in Aynal, this paper gives some suggestions on the value of wind load on curtain wall structure, and especially emphasizes that the wind tunnel test report can only be used in practical engineering after being verified by wind experts independent of wind tunnel test units design.