Questions regarding NB/T 47041-2014: wind pressure height coefficient and wind vibration coefficient
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The minimum value for the wind excitation coefficient, as specified in the code for towers NB/T 47041-2014, is 1.7: https://bbs.hcbbs.com/forum.php?mod=image&aid=1382865&size=300x300&key=f6e8127eae0b70a3&nocache=yes&type=fixnone. Meanwhile, the code for building structural loads uses a different method for calculation: https://bbs.hcbbs.com/forum.php?mod=image&aid=1382866&size=300x300&key=d5ab1b223ea82fd3&nocache=yes&type=fixnone. The requirements specified in NB/T 47041-2014 differ significantly from those in GB50009-2012； Another factor is the height coefficient. Table 10 in the tower specification NB/T 47041-2014 refers to the content of Table 7.2.1 in GB50009-2001: https://bbs.hcbbs.com/forum.php?mod=image&aid=1382868&size=300x300&key=422743d2531d05e1&nocache=yes&type=fixnone; https://bbs.hcbbs.com/forum.php?mod=image&aid=1382867&size=300x300&key=92c1b007683cbfb3&nocache=yes&type=fixnone. The latest version of the code for loads on building structures is GB50009-2012, and its table 8.2.1 regarding height coefficients differs significantly from previous versions: https://bbs.hcbbs.com/forum.php?mod=image&aid=1382869&size=300x300&key=74ae041f6c0db9bd&nocache=yes&type=fixnone. The wind excitation coefficient and the height coefficient are specified differently in the NB/T 47041-2014 and GB50009-2012 codes, which results in the wind loads calculated according to the 2014 version of the tower specification being considerably higher than those calculated using the 2012 version of the code for loads on building structures ；
The building load code referenced in NB/T47041-2014 is the 2006 version, so the data are inconsistent. The data in GB50341-2014 refers to the 2012 version.
This problem often occurs in domestic standards: standards reference each other, and when the referenced standards are updated, the references are not updated in a timely manner, resulting in the new standards referencing versions that are no longer valid.
This problem often occurs in domestic standards: standards refer to each other, and when the referenced standards are updated, the references are not updated in a timely manner; as a result, the new standards end up referencing versions that are no longer valid