Rolling Stock > Structural Model > WIB
Definition of the structural system to be analyzed. The tool allows for analyzing some standard types of bridge structures and up to a certain size also models specified in the analysis program RM. The actual type of the structure to be analyzed is selected in the pull-down menu of the input field Model Type.
Setting | Description |
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WIB | The structure is a so called WIB (filler beam) structure, where standard rolled sections are arranged in longitudinal direction in a plate-like single span concrete structure. The structure is statically determinately supported on both ends, either line-like over the whole width or in2 points at prescribed distances from the edges. The program creates an equivalent girder grid with composite beams and concrete cross beams. An orthogonal grid is assumed (support lines normal to longitudinal direction). |
Plate Input
Definition of the parameters specifying the structure geometry and material properties
Setting | Description |
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Span length L | Clear length between the support lines |
Plate width W | Width of the concrete plate (Number of steel profiles times distance between) |
Thickness plate T | Thickness of the concrete plate |
Excess length EL | Excess length of the plate beyond the support line |
Amount of Steel girders | Number of encased rolled steel sections (max. 14). It is assumed, that the bottom face of the steel section is flush with the bottom face of the concrete plate. The distance between the profiles is assumed constant. |
E-Modulus Steel | Young's modulus of the material of the rolled sections. The shear modulus is calculated with G=E(2*(1+ny)) with ny=0.3 |
E-Modulus Concrete | Young's modulus of the material of the concrete plate. The shear modulus is calculated with G=E(2*(1+ny)) with ny=0.2 |
Support Conditions
Definition of the parameters specifying the support conditions
Setting | Description |
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Continuously supported / Single Bearings | Selection of one of the alternatives "Line support" or "Support in 4 points" |
Stiffness vertical | Spring constant for the vertical displacement (for each bearing, in the case of line support, bearings with this stiffness are arranged below each longitudinal girder) |
Stiffness horizontal | Spring constant for the horizontal displacement (for each bearing, springs in longitudinal direction in the left support line (superstructure begin), springs in lateral direction below the 1st longitudinal girder (node 101 and 117). |
Position 1st Bearing PB1 | Only for "Single Bearings": Distance of the bearing from the plate edge left - down |
Position 2nd Bearing PB2 | Only for "Single Bearings": Distance of the bearing from the plate edge left - up |
Position 3rd Bearing PB3 | Only for "Single Bearings": Distance of the bearing from the plate edge right - down |
Position 4th Bearing PB4 | Only for "Single Bearings": Distance of the bearing from the plate edge right - up |
Steel Cross-Section
Definition of the cross-section properties of the encased steel profiles. I-profiles of the series HEA, HEB and HEM can be handled and I-profiles with user defined geometry parameters.
Setting | Description |
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Girder Type | Name of the steel section (selection from the pull-down menu). If the file girdertypes.inp is not found in the program or project directory, the geometric parameters described below can be directly entered. |
Width WS | Flange width of the double T section |
Height HS | Total depth of the cross-section of the double T section |
Thickness web TW | Thickness of the web of the double T section |
Thickness flange TF | Thickness of the flanges of the double T section |
Radius R | Transition radius from the web to the flange |
Loading
Definition of the effective masses of the bridge. The selfweight of the load bearing structure ist calculated automatically within the program. Used specific weights: 25 kN/m3 for concrete, 78.5 kN/m3 for steel (fix).
Eccentricities
Definition of the axle load distribution over the width of the plate
Setting | Description |
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Track load factor (1-14) | These factors define the distribution of the axle load over the different longitudinal girders in accordance with the position of the track on the cross-section and the width of the crossties. |