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Include Top Lateral Bracing for Section Properties? [Yes/No]: According to DOT requirements, the top lateral bracing area may or may not be included in the sectional property computations. When included, it increases the inertia and section modulus while decreasing the stress values, making the calculation less conservative.
Mlat Comp Method[FEA/AASHTO_Eqn_C4_6_1_2_4b_1/EnvelopeofFEAandAASHTOeqn]: If the user selects the FEA option, the lateral bending moments are calculated using finite element analysis. The OpenBrIM model divides the steel I-girder into three finite elements, using a beam for the top and bottom flanges and a shell for the web. This approach provides the user with a more accurate way to calculate realistic lateral bending values. However, if the user prefers to use the AASHTO equation, which converts the major axis bending moment to lateral bending, it may result in a more conservative approach. OpenBrIM provides an additional option for the user called "Envelope of FEA and AASHTO equation" which selects the larger value between the FEA and AASHTO equation results.
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).
Fatique Parameters
ADTT: The annual daily truck traffic is a parameter used in fatigue checks.
Number of lanes available to truck: Number of lanes available to truck is a parameter used in fatigue checks.