Hi, I've added pattern loading to an existing model in RAM Concept, the slab has some heavy live loads (24 kN/m2) on around a quarter of the area, down to 2 kN/m2 in light regions. When running the analysis, the heavily loaded areas require almost no extra reinforcement (compared to standard analysis without patterns), however the lightly loaded areas have been saturated with reinforcement (when ran with patterns). The moments are very high in these regions too (up to 600 kNm, about 60 before). Have there been other similar incidences?
As a note I'm working to EC2, I did find however that an American code suggests using pattern loading where the live load is greater than 75% of the dead load - (the lightly loaded areas are around: LL 20-40% of DL, whereas the heavy areas have LL at 200% DL).
Any advice greatly received.
Jc