建筑围护结构风荷载效应的国内外标准对比

COMPARATIVE RESEARCH ON WIND LOAD EFFECT AND EVALUATION FOR BUILDING ENVELOPE IN NATIONAL AND INTERNATIONAL CODES

针对建筑围护结构,研究了中国GB 50009-2012《建筑结构荷载规范》、日本标准AIJ-2004、美国标准ASCE/SEI 7-10和澳大利亚/新西兰标准AS/NZS 1170.2∶2011等荷载标准中有关抗风设计的规定,深入探讨基本风压、地面粗糙度分类、体型系数、风载设计值和风载效应等方面内容,并以中低层建筑中常见的几种情况为实例进行风载效应的对比分析。研究表明:GB 50009-2012对围护结构表面风压的规定,在考虑建筑高宽比、风压分区方式、面积折减等方面有待改进。GB 50009-2012在屋面和墙面的风压计算中没有分出角部区域,边缘和角部区域的风荷载体型系数取值偏小。

A detailed comparison on basic wind pressure,exposure factor,pressure coefficient,design wind pressure and wind pressure effect of the building envelope has been made among codes and standards of various countries and regions including China (GB 50009-2012),Japan (AIJ-2004),USA (ASCE/SEI 7-10)and Australia/New Zealand (AS/NZS 1170.2:2011).Based on the same wind velocity and same duration,the design wind pressure and effects for mid-high and long-span buildings were calculated by the four codes,and comparative analysis showed that building height to width ratio,wind pressure,partitions and reduce factor for area could be improved in GB 50009-2012.The corner zone should be partitioned and the edge zone wind pressure is too small in GB 50009-2012.