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It shouldbe OK if you have atleast provided temperature and shrinkage reinforcement

Following are some lines from my ms thesis; Ritz modes are more efficient specially for a tall building with higher modes and it captures the most "optimum" modes (CSI, 2011). In non-linear analysis, use of Ritz modes become essential (CSI, 2011). If the building has some flexibly elements like antena etc, use Ritz modes, it will discard the modes associated to antena. There is also a youtube video about this from Ashraf HabibUllah delivered at AIT, Thailand. Search this on youtube; Ashraf HabibUllah Eigen vs Ritz Modes Lecture