Model description

Input

Geometry model

Analysis model

Landscape model

ICDAS Basis of Design

Workflow of Software

Additional features

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.

 
 
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Figure:

Figure:

Automatic creation of envelope of 8 basis combinations

of temperature

ICDAS ARB provide automatic creation of envelope of 

basis combinations of loadcases on bridges. An example is

"Envelope Temperature" which will select one worst case

among the 8 combinations defined in the envelope.

An envelope will create two results either in Max or Min values. 

 

Figure:

Automatic creation of envelope of moving load

LM1 and LM3

ICDAS ARB provide automatic creation of envelope of

single loadcases on bridges. An example is "Envelope Tandem

600kN Lane1" which will select one tandem position (as a

single loadcase) on bridge, among the cases defined in the

envelope, and report either a Max or Min value.

Figure:

Automatic creation of smart combinations

ICDAS ARB provide automatic creation of smart

combinations of loadcases on bridge. In the list to the right the

smart combinations are named either "ULS..." or "SLS"... which

combine loadcases after in Eurocode 1 Traffic loafs on bridges

and Danish Road Directorate.

A smart combination separate results in maximum and

minimum values for each node on Bridge. It combines in a

smart way the cases defined in the combination. E.g. all of

single cases for the UDL are adding in a smart combination.

Then the (Max) and (Min) results will select the UDL cases

which give maximum or minimum tension in bottom of deck

at a select node on bridge.

Further, LUSAS smart combination can also consider:

§      a node where long term load effects are all negative.

§      a node where short-term load effects are of mixed sign.

§      a node where short-term load effects are of mixed sign

      with the “Loadcases to consider” set to four.

§      a node where short-term load effects are of mixed sign

      with the “Loadcases to consider” set to four and the

      “Variable loadcases” set to four.

§      a node where short-term load effects are of mixed sign

      with the “Loadcases to consider” set to four and the

      “Variable loadcases” set to one.

Figure:

Automatic creation of final envelope of smart

combinations

ICDAS ARB provide automatic creation of final envelope

of smart combinations of loadcases on bridge.

The (Max) and (Min) results from the final envelope will trace

the worst result from the worst cases in the smart combinations

defined in the envelope.

Figure: