Recent content by GWZ@CN

thanks for your patience.I find I'm error cause I missed the '50%'.maybe I get mistaked by the co-use of '50%' and 'average'.thanks

Am I understand the m correctly? My understanding is that when calculate a single span potal frame,m always equals 1,because there alway be a column which Ned is less than the average.And for double span frame,which the inside column NEd is usually much larger than the other two,so m equals 1...