What is the meaning of ‘cut off mode 150’ in STAAD software?

CUT OFF MODE 150 means the user has requested the software to consider 150 modes for the dynamic analysis. By default the software considers 6 modes and in case more number of modes are required to get enough mass participation (greater than 90% is recommended by most codes), user can do so by using the CUT OFF MODE command. More details are available in technical reference section 5.30.1


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