Shear Stud Code Check T [SIG]

General

Load Combination Table: The load combination table is used to map the analysis result cases and their corresponding factors to the template, along with the limit states. It serves as the basis for all finite element analysis results used in the code check equations.

Include Haunch For Section Properties[Yes/No]: According to DOT requirements, haunch area may or may not be included in the sectional property computations. When haunch is included, it increases the inertia and section modulus and decreases the stress values, making the calculation less conservative. When the option "Include Haunch for Section Properties" is set to "No", the dimensions of the haunch are still used to determine the locations of the deck and girder sections. As a result, entering a larger haunch depth can lead to a higher section modulus, even though the option to include the haunch is set to "No".

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).

AASHTO Edition [9th/10th Edition]: Select the AASHTO LRFD edition (9th or 10th) to apply the corresponding shear stud design provisions.

Selecting the 10th Edition activates the following changes/updates to the shear stud design provisions compared to the 9th Edition.

1. Height-to-Diameter Ratio Limit : The minimum Height-to-Diameter Ratio (H/dsc​) for shear studs has been redefined in the 10th Edition from a single minimum limit of 4.0'' to new, material-dependent maximum limits: 5.0'' for Normal-Weight Concrete and 7.0'' for Lightweight Concrete.

2. Pitch Calculation for Clustered Studs : A new equation for calculating the shear stud pitch (p) must be used when the studs are arranged in a clustered (non-regular spaced) configuration. A new pitch calculation formula for clustered shear studs has been introduced (Article 6.10.10.1.2-2). For regularly spaced shear studs, the pitch calculation remains unchanged from the 9th Edition.

3. Fatigue Shear Resistance Factor (Zr​) : The method for calculating the Fatigue Shear Resistance (Zr​) has been modified in the 10th Edition. In the new calculation method, Table 6.6.1.2.3-1 is used.

4. In the 9th Edition, the Fatigue I load combination was required when the projected 75-year single lane Average Daily Truck Traffic (ADTTSL) was greater than or equal to 1090 trucks per day, a single fixed numerical threshold.

5. In the 10th Edition, this fixed threshold has been replaced by a criterion based on the specific detail category. For shear studs (Detail 9.2 in Table 6.6.1.2.3-1), the ADTTSL​ value equivalent to infinite life has been explicitly established as 11,320 trucks per day.

6. Minimum Pitch Limit : The minimum allowable center-to-center pitch (pmin​) for shear studs has been reduced in the 10th Edition. It was limited to 6⋅dsc​ (six times the shear stud diameter) in the 9th Edition, and the new limit is now 4⋅dsc​.

7. Factored Shear Resistance of a Single Shear Connector, Qr : In the AASHTO Equation 6.10.10.4.1-1 for the factored shear resistance of a single shear connector, the resistance factor for shear connectors (ϕsc​) specified in Article 6.5.4.2 has been increased from 0.85 to 1.00 in the 10th Edition.

Concrete Type for Stud Embedment [Normal Weight Concrete/Lightweight Concrete]: Select the concrete type to define the applicable maximum Height-to-Diameter Ratio (H/dsc​) limit for shear studs (5.0 for Normal-Weight or 7.0 for Lightweight Concrete).

Fatigue 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.