Table 7: Modal analysis results of the column.

Six factors and five levels
The top to the first rib platesThe first to the second rib platesThe remaining distance between rib platesThe roof column widthThe column
plates thickness
The rib plates thicknessNatural frequency

180080092510501354517.953
2900800115011001505518.016
3100080010759001434018.063
4110080085010001205017.906
5120080010009501276017.859
6800900100010001435517.965
79009009259501204017.903
81000900115010501275017.960
91100900107511001356017.921
1012009008509001504518.072
11800100085011001274017.773
12900100010009001355017.779
131000100092510001506017.842
141100100011509501434517.859
1512001000107510501205517.799
16800110010759501505017.768
17900110085010501436017.778
1810001100100011001204517.772
19110011009259001275517.785
2012001100115010001354016.739
21800120011509001206017.656
229001200107510001274517.833
23100012008509501355517.766
2411001200100010501434017.941
251200120092511001505017.937