General

Girder: Girder for code check

Station: Station along the PGL

Code Check Template: The code check template is utilized to extract global parameters, results from finite element analysis, and limit states employed in the design process.

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.

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.

Input Data Preference [Lumped/Detailed]: When computing the sectional properties of a composite section with deck rebars in a steel I-girder, only the vertical position and area are taken into account, and there are two available data entry methods. The first method involves lumping the total rebar area within the effective width and specifying its location. Alternatively, the detailed method enables the user to input transverse and longitudinal reinforcement as well as rebar spacing, with the OpenBrIM Library component calculating the lumped reinforcement area and its location within the effective width based on user inputs.

Deck Rebar Material: Enter a single material for both top and bottom reinforcement.

If “Lumped” selected

Modular Ratio Comp. Method [EsbyEc/User Input]: The modular ratio can be computed either by dividing the modular ratio of steel by that of concrete or by using a user-defined input. This parameter allows users to specify the method for calculating the modular ratio.

Modular Ratio: If the Modular Ratio Comp. Method is defined with the option 'User Input,' a modular ratio can be defined manually. Otherwise, this parameter will be marked as not applicable (N/A).

Deck Reinforcement

Input Data Preference [Override Deck Rebar/Use Deck Rebar]: For deck rebar to be used in girder code checks, users are provided with two options. The code checks can either be conducted using the modeled deck rebar or with new rebar definitions.

If the input data preference is defined with the option 'Override Deck Rebar,' the parameters listed below can be used to define the rebars for code checks. Otherwise, if the input data preference is defined with the option 'Use Deck Rebar,' the parameters below will not be applicable.

Lumped Top Reinforcement Area within the Effective Width:

This parameter can be used to specify the lumped reinforcement area within the effective width when overriding deck rebar.

Distance from the Centerline of Top Bars to the Top of the Deck: This parameter can be used to define the distance from the centerline of the top reinforcement bars to the top of the deck.

Lumped Bottom Reinforcement Area within the Effective Width

If “Detailed” selected

• 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.

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.

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: This parameter can be used to specify the lumped reinforcement area within the effective width for the bottom deck rebar.

Distance from the Centerline of Bottom Bars to the Bottom of the Deck: This parameter can be used to define the distance from the centerline of the bottom reinforcement bars to the bottom of the deck.

Deck Rebar Material: This parameter can be used to specify the material used for the deck rebars.

Concrete Creep Adjustment Factor: This parameter can be used to define the adjustment factor for concrete creep in calculations.