When the load combinations are not “enveloping”, the program declares the load combinations as “seismic” or “not seismic” appropriately. However, when An enveloping combination is not recommended during seismic design. When a load combination is not specified as enveloping, loading is appropriately declared seismic or not seismic. When the load combination is “enveloping” enveloping, the program does not declare the load combinations as “seismic” as enveloping enveloped forces at different stations can may come from any of the included combos. In addition, the combinations. As a result, load combinations are not declared as seismic or not seismic. Further, load combination forces loose associations. Thereforelose association.
During seismic design, it is not recommended to design using this type of combinations when seismic loading are present. Please note that the program internally design for each load combination specified in the "Design Load Combination" list and report the result for the worst one. In view of the above, it is advised to design independently for all load combinations advisable to design independently for each seismic load combination contained in the enveloping combocombinations.