Nemetschek Engineering User Contest 2009 • Category 3: CAE Civil Works 111 3 Launching of a bridge in Trinidad • Load case 5: wind - direction 2 - between launching • Load case 6: displacements = bridge “fitting”: depends on the position of the bridge and for each calculation model this will be different) The position of the bridge during the erection is given by a relative parameter αrel. Following steps are taken to model a certain position of the bridge: • Calculation of αrel that corresponds with a certain position of the bridge. • Delete parts of the bridge that are not yet connected in that stage of launching or construction. • Rotation of the nodes of the bridge (+launching nose). At this point, the form of the bridge is still the same as in the final position. The nodes of the launching way and the temporary supports are not rotated. • Determination of the intersection points of the south and north girders with the vertical plane of the temporary supports and the launching way. • Determination of the displacements, so that the part of the bridge is placed on the temporary supports (**) = creating load case 6 (=”bridge fitting” = displacements): the displacements of block 3 (see step 4) are given to the part of the bridge that is being considered. This load case is added to the combinations. • The model is ready to be calculated. For each position, the displacements to place the bridge on the temporary supports are calculated (see load case “bridge fitting”). Reactions, section forces, deformations and profile checks are made for each position. All this displacements are determined with ESA-Prima Win with secondary drawing beams.
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