topic Concentrated slab results in Robot Structural Analysis Forum

topic Concentrated slab results in Robot Structural Analysis Forum https://forums.autodesk.com/t5/robot-structural-analysis-forum/concentrated-slab-results/m-p/5568352#M66738 Hi I have some questions about high concentrated internal forces of slabs. Background information:I'm designing a concrete bridge deck in transverse direction.The deck is modeled of 12 slab elements with varying thicknesses (capture_1.jpg). Pinned linear supports are placed at the locations of longitudinal steel girders. Problem description:As you can see, there are extremely high Qyy values at the beginning of the slab when the vehicles are placed at the beginning of it, see (Qyy_1.jpg). The high Qyy values do not seem right at all.  When the vehicles are placed further away, the Qyy values are more reasonable, see (Qyy_2.jpg). Myy values at the beginning of the slab, when the vehicle is placed at the beginning, are also larger than they are further away, see (Myy_2) and (Myy_3). This could be explained with small area for load distribution at the beginning of the slab. But on the other hand very high Qyy values may indicate that distribution of loads is not totally correct. Myy_2<IMG border="0" alt="Myy_2.JPG" src="https://forums.autodesk.com/t5/image/serverpage/image-id/161671iDED14965EEC05A7E/image-size/original?v=mpbl-1&px=-1" title="Myy_2.JPG" />  Myy_3<IMG border="0" alt="Myy_3.JPG" src="https://forums.autodesk.com/t5/image/serverpage/image-id/161672i65F80FECFB2C0936/image-size/original?v=mpbl-1&px=-1" title="Myy_3.JPG" /> Different mesh sizes have been tested. Results remained the same. Questions:How to avoid the extreme Qyy values?Is it possible to correct the model somehow to get reasonable results?Can the extreme values just be neglected?Are the Myy values correct even though the Qyy values are not? Best regards. Thu, 02 Apr 2015 11:04:42 GMT Anonymous 2015-04-02T11:04:42Z