Is it necessary for 1st two mode in modal mass participating ratio be in alternate either x or y? Or is it okay if both are in same direction? Width of building is 20ft and length is 68 ft🤔 12*12 column gives 1st two mode in longer span Hope for your help
on modelling residental building of three and half floor on etabs, it became eccentric by 10% in one side from calculating center of mass and center of rigidity. what should i do, just design it as it is or if modify what would be??