Kris /DSENJU Thanks for your reply. Can you tell me how Can I solve the error " **ERROR : MASS PARTICIPATION IS LESS THAN 75 PERCENT IN PUSH LOAD DIRECTION. FURTHER ANALYSIS IS STOPPED."
What does it really means? Does it mean the structure does not response to the seismic spectrum as less than 75% of the mass participate or it is because FEMA 356 require more than 75% participation for lateral load distribution (i.e. Clause 3.3.3.2.3 of FEMA]. Please Note the 75% limit stated in FEMA 3.3.3.2.3 is no longer in its replacement i.e. ASCE 41-06 Clause 3.3.3.2.3.
Furthermore FEMA440 (which partially replaces FEMA356) no longer recommend multiple load pattern & states that a single pattern based on first mode shape is recommended.
Any idea re timetable when Bentley are expected to address the problem (which was also confirmed by DSANJU post)?