ICDAS ARB provide automatic creation of loads and loads combinations on bridges. Load models and factors are according to Eurocodes 1 Traffic loads on bridges DS/EN1991-2: 2003 and Danish Road Directorate. The user of software from outside Denmark can double click on a combination to modify the loads factors according to the associated countries.
Figures to the right show an example of loads on an arch bridge of 100m span (120m total length). There are automatically created 446 loadcases including single loadcases, basis combinations, smart combinations and the envelopes. The steps of moving loads has been input to 3m. Setting e.g. 1m, the total number of single cases of the moving loads will be increased by 3 times. The computer time will increase but a more detailed result will be obtained. The user can also manually move the point loads closed, and add additional point loads as wishes, then solve the model again for selected "Loadcases to Solve..." by right- mouse-click on the associated Analysis(*i*) tab. Note that the case ICDAS automatic loads creation has been manually modified/ added, the user need also manually to update envelopes and smart combinations for the newly created loads.
**Automatic creation of single loadcases**
ICDAS ARB provide automatic creation of single loadcses on bridges. An example of single loadcases is the UDL (Uniformly Distributed Load) which are automatically created from surfaces creating the deck. Values of the UDL are given in input according to its positions across the deck cross section Further, moving loads along the bridge deck are also automatically created. E.g. tandem and class load are modelled as single cases stepped along the bridge. The step distance and the values of point loads for tandem and class load are specified in input according to the number of lanes on bridge. Having all single loadcases created, one can visualize displacements, stresses, sectional forces or other results at a single case to identify its contribution in a subsequent combination. |