General
Girder: Girder for code check
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Panel Type [InteriorPanel/EndPanel]: The terms "end panel" and "interior panel" are used to describe the sections of a steel girder plate that are positioned at the ends and interior sections of the girder, respectively, as depicted in the accompanying figure. The interior panels comprise the remaining segments of the girder that lie between the end panels.
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Type of Construction [ShoredConstruction/UnshoredConstruction]: For steel I-girder bridges, unshored construction is commonly employed. In this method, any permanent load applied before the concrete deck has hardened or become composite is assumed to be borne entirely by the steel section, while any permanent load and live load applied after this stage are assumed to be supported by the composite section. In the case of shored construction, all permanent load is assumed to be applied after the concrete deck has hardened or become composite, and this information should be clearly stated in the contract documents.
Deck Reinforcement
In the computation of the sectional properties of a composite section for negative bending regions in a steel I-girder, deck reinforcement is taken into account.
Deck Rebar Material: Enter a single material for both top and bottom reinforcement.
Long. Deck Rebar Spacing(Top Layer)
Long. Deck Rebar Spacing(Bottom Layer)
Long. Deck Rebar Diameter(Top Layer)
Long. Deck Rebar Diameter(Bottom Layer)
Trans. Deck Rebar Diameter(Top Layer)
Trans. Deck Rebar Diameter(Bottom Layer)
Clear Cover(Top)
Clear Cover(Bottom)
Concrete creep adjustment factor: To incorporate the effects of concrete creep in stress calculations that involve the application of long-term loads to the composite section in regions of negative flexure, the area of the longitudinal reinforcement can be conservatively adjusted by dividing it by the "Concrete creep adjustment factor." The concrete is assumed to transfer the force from the longitudinal deck steel to the rest of the cross-section, with concrete creep acting to reduce that force over time. It is important to note that assuming a value greater than 1 is a conservative approach and is not mandated by the AASHTO LRFD BDS. As such, it is not recommended to use this assumption in normal design practice. When using the default value of 1, the reinforcement area will remain unaltered.Modular Ratio Comp. Method:
Modular Ratio:
Cover Plates
Cover plates are additional plates that are attached to the flanges of girders to enhance the flexural capacity of the girder over a certain section of the beam. The load rating object provides users with the option to add side and cover plates to the top or bottom flange. Section modulus and stress values will be calculated based on these inputs under live loads. However, actual girder plate dimensions will be used for other permanent loads.
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Top Flange Cover Plate Thickness:
Top Flange Side Bottom Flange Cover Plate Width:
Bottom Flange Cover Plate Thickness:
Top Flange Side Plate Height:
Bottom Flange Cover Plate Width:
Bottom Flange Cover Top Flange Side Plate Thickness:
Bottom Flange Side Plate ThicknessHeight:
Bottom Flange Side Plate HeightThickness:
Section Losses
In case of corrosion in plate girder sections, section loss parameters can be used by the user to decrease the section dimensions or cover plate dimensions. If section dimension loss parameters are applied, stress caused by permanent loads and live loads will be calculated according to the section loss parameter. If only cover plate loss is taken into account, the live load stress computation will be the only one to utilize that parameter.
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Bottom Flange Thickness (%) Loss:
Web Thickness (%) Loss:
Stiffener
Has Long. Stiffener [NO/YES]: Select "Yes" if the girder code check station is located between two transverse stiffeners.
Has Trans. Stiffener [NO/YES]: Select "Yes" if there is a longitudinal stiffener that passes through the girder code check station.
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Stiffener Spacing Computation [Use Cross Frame Spacing/User Input]: As shown in the figure below, each cross frame is usually connected to a connection stiffener. If no additional intermediate stiffener is present, the user may simply use the cross frame spacing as the stiffener spacing. However, if there are additional stiffeners at the code check station, the user must manually enter the transverse stiffener spacing.
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Transverse Stiffener Spacing: The spacing between the transverse stiffeners, as shown in the illustration below.
Long. stiff-comp. flange: The distance from the compression flange to the longitudinal stiffener.Top Cover Plate Width (%) Loss:
Top Cover Plate Thickness (%) Loss:
Bottom Cover Plate Width (%) Loss:
Bottom Cover Plate Thickness (%) Loss:
Web Cover Plate Thickness (%) Loss: