PEB.RESPONSE SPECTRUM ANALYSIS.std
The model contains MEMBER TENSION specification and Load Case 3 is a response spectrum load case. In the Help manual it is mentioned under section TR.23.3 Member Tension/Compression Specification that if response spectrum load case is present MEMBER TENSION command should not be used. Hence program is throwing warning message. To remove this warning introduce Perform Analysis-Change command followed by MEMBER TENSION 0 before Load Case 3. MEMBER TENSION 0 switches off all tension only specifications for load cases which are specified subsequent to this command. Regarding zero values along Z direction notice that program by default extracts first 6 modes and Z direction mass participation is zero in the first 6 modes. To ensure mass participation along Z direction increase the modes by using CUT OFF MODE SHAPE 100 command.PEB.RESPONSE SPECTRUM ANALYSIS_mod.STD
and load combinations as per IS1893 part 1(2016)