CFS Combined T+V Calculator, AISI S100-16 w/S3-22

What it checks

The module designs a cold-formed steel screw connection that carries shear and tension simultaneously. It implements the interaction requirements of AISI S100-16 w/Supplement S3-22 §J4.5 for both design methods. The engine applies the specific resistance and safety factors printed in the specification, using φ = 0.50 for LRFD and Ω = 3.00 for ASD. The design method determines the load basis and capacity calculation. For LRFD, the module uses factored demands and calculates capacity as φ · Pn. For ASD, it uses service demands and calculates capacity as Pn / Ω. The module echoes the selected design method back in the results to confirm the basis of the calculation. Per §J4.5, the connection must satisfy both interactions simultaneously. The module evaluates the combined effect of tension and shear to ensure the connection meets the linear interaction criteria defined in the code. The results reflect the simultaneous satisfaction of these interaction equations.

Inputs

Design Method - Selection of "LRFD" for factored loads or "ASD" for service loads.
Screw Size - Standard self-drilling screw size used to determine the shank diameter.
Head Type - Head configuration such as hex-washer, wafer, or truss, which affects the effective washer or head outer diameter.
Custom Diameter - Optional custom effective washer or head outer diameter for proprietary connections, overriding typical industry catalog values.

What it reports

Design Method - The selected method, echoed back as "LRFD" or "ASD" to confirm the input basis.
Resistance Factor - The phi value used for LRFD calculations, reported as 0.0 when ASD is selected.
Safety Factor - The omega value used for ASD calculations, reported as 0.0 when LRFD is selected.
Interaction Check - The verdict on whether the combined shear and tension demands satisfy the §J4.5 interaction requirements simultaneously.
Capacity Basis - The calculated capacity based on the selected method, either φ · Pn for LRFD or Pn / Ω for ASD.

Code references

The engine cites AISI S100-16 w/S3-22 §J4.5 for the combined shear and tension interaction. It references §J4.4.3 for the printed values of Ω = 3.00 and φ = 0.50. The module also references §J4.4.2 for pull-over considerations related to the effective washer or head outer diameter. The source notes that §A4.1.2 is S100-12 numbering and is not a section of S100-16 w/S3-22.

Limits

The module assumes standard self-drilling screws and uses typical industry catalog values for washer and head diameters unless a custom value is provided. It does not account for non-standard or proprietary connection geometries beyond the custom diameter input. The interaction check is limited to the linear form specified in §J4.5.1. Results are engineering aids; the engineer of record is responsible for the design.

This module ships in the desktop app

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