*I am running P-Delta Analysis on a reinforced concrete tank
PDELTA ANALYSIS CONVERGE 2 SMALLDELTA
*The bottom of the tank is supported on soil and I am using foundation support as follows:
SUPPORTS
2578 TO 3393 PLATE MAT DIRECT Y SUBGRADE 31 PRINT COMPRESSION
*The analysis gives my many warnings about instability which I am assuming though to Compression only support definition (see above line).
*so I went ahead and changed the support definition to get rid of compression only as follows:
SUPPORTS
2578 TO 3393 PLATE MAT DIRECT Y SUBGRADE 31 PRINT
*I then ran the P-Delta analysis and all the warnings went away.
*Question is: Compression only supports do not work with P-Delta analysis?
*Using the normal "PERFORM ANALYSIS" does not give me any warning with the following:
SUPPORTS
2578 TO 3393 PLATE MAT DIRECT Y SUBGRADE 31 PRINT COMPRESSION
Thank You in advance.