不同结构分析软件中风荷载计算方法探讨

DISCUSSION ON CALCULATING METHODS OF WIND LOAD IN DIFFERENT STRUCTURAL ANALYSIS SOFTWARES

不同的软件在进行风荷载分析时采用的计算方法有所不同,计算结果会有一定的差别。首先介绍GB50009—2012《建筑结构荷载规范》中风荷载的计算方法;然后介绍PKPM、YJK、ETABS、MIDAS/Gen等4种软件中风荷载的简化计算方法;最后,以1栋16层的住宅建筑为算例,将规范理论计算结果与各个有限元软件计算结果进行对比分析。结果发现:PKPM、MIDAS/Gen公式法、YJK计算的风荷载作用与规范中公式法得到的风荷载作用相近,而MIDAS/Gen查表法、ETABS计算的风荷载作用与查表法得到的风荷载作用相近;ETABS和MIDAS/Gen查表法计算的风荷载作用小于PKPM、MIDAS/Gen公式法、YJK计算的风荷载作用;MIDAS/Gen查表法计算楼层效应时存在一定的弊端,建议在利用MIDAS/Gen计算风荷载效应时采用其自带的公式法。

The calculating methods of wind load are different in various softwares,so the results has distinctions. This paper introduced the theoretical calculating method of wind load in GB 50009—2012 Load Code for the Design of Building Structures and the simplify calculation methods in PKPM,YJK,ETABS and MIDAS/Gen softwares. Then theoretical calculating results and software calculating results were compared by an example of 16-floor building. The analysis results showed that the results of calculating wind load in PKPM,YJK,MIDAS/Gen with formula correspond to formula method in code,but the results of calculating wind load in ETABS and MIDAS with table correspond to method of table lookups in code. The results of wind load in ETABS and MIDAS/Gen with table were lower than the results in PKPM,YJK and MIDAS/Gen with formula. MIDAS/Gen with table had some disadvantages when calculating floor effect,therefore MIDAS with formula was suggested to use when calculating floor effect.