ACI 318-99 default load combinations
This section provides information on the default load combinations (technically, loading combinations) that RAM Concept creates when you start a new ACI 318-99 file. The purpose and origin of each load combination are given. You can remove or modify any of these load combinations. You can also add load combinations. The load combinations are from ACI 318-99, unless noted otherwise.
RAM Concept uses loading types to determine the appropriate factors in some load combinations.
Note: Some load combinations in mat (raft) files are of the Lateral Group type and use a "Zero-Tension" analysis. Since a load combination using a "Zero-Tension" analysis does not use Alternate Envelope Factors, then such load combinations in mat files have been expanded into multiple load combinations. In some cases, the assumption that all gravity loads act in the same direction have been used to keep the number of load combinations to a minimum. See Specifying Load Combinations
for further description.