The difference is in the total applied load force wind Y model 1 127 k model 2 343 k As reported in the Loads and Applied force report (and also in the analysis log total reactions). The reason for the difference is…

You get a different frequency values and that affects the Gust factor which, in turn, affects the total pressure. You may want to manually specify the frequency for the wind load in advance when using flexible diaphragm types Check our post on Pseudo…