Seismic Analysis

I am analysing a platform attched to the vessel. I applied UBC load in the seismic definition. While running the program, i am getting an error as"    **ERROR- STRUCTURE HAS NO WEIGHT ABOVE THE BASE FOR UBC ANALYSIS". can anyone clarify this.

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  • 1.ERROR- STRUCTURE HAS NO WEIGHT ABOVE THE BASE FOR UBC ANALYSIS". can anyone clarify this.

    2.**WARNING: IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION   OR REPEAT LOAD OR RE-ANALYSIS OR SELECT OPTIMIZE, THEN EACH   UBC/IBC CASE SHOULD BE FOLLOWED BY PERFORM ANALYSIS & CHANGE"

    please sir solve this problem  so many time design same error

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  • 1.ERROR- STRUCTURE HAS NO WEIGHT ABOVE THE BASE FOR UBC ANALYSIS". can anyone clarify this.

    2.**WARNING: IF THIS UBC/IBC ANALYSIS HAS TENSION/COMPRESSION   OR REPEAT LOAD OR RE-ANALYSIS OR SELECT OPTIMIZE, THEN EACH   UBC/IBC CASE SHOULD BE FOLLOWED BY PERFORM ANALYSIS & CHANGE"

    please sir solve this problem  so many time design same error

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