Column-Web Depth Clear of Fillets Calculator

Web Depth Formula:

\[ dc = \frac{4100 \times twc^3 \times \sqrt{Fyc}}{Pbf} \]

Web Depth (mm):

1. What is Column-Web Depth Clear of Fillets?

Definition: This calculator determines the required depth of a column web clear of fillets based on web thickness, yield stress, and computed force.

Purpose: It helps structural engineers ensure proper web depth for moment connections in steel structures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ dc = \frac{4100 \times twc^3 \times \sqrt{Fyc}}{Pbf} \]

Where:

\( dc \) — Web depth clear of fillets (mm)
\( twc \) — Column web thickness (mm)
\( Fyc \) — Column yield stress (MPa)
\( Pbf \) — Computed force (kN)

Explanation: The formula calculates the minimum required web depth to resist the computed force considering the material properties.

3. Importance of Web Depth Calculation

Details: Proper web depth ensures structural integrity, prevents local buckling, and maintains connection strength in moment-resisting frames.

4. Using the Calculator

Tips: Enter column web thickness (mm), yield stress (MPa), and computed force (kN). All values must be > 0. The ±5% indicates acceptable tolerance ranges.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the 4100 constant?
A: This empirical constant accounts for material properties and safety factors in the calculation.

Q2: Why is yield stress under a square root?
A: The square root relationship reflects how material strength affects web depth requirements non-linearly.

Q3: What does "clear of fillets" mean?
A: It refers to the flat portion of the web excluding the curved transitions (fillets) at web-flange junctions.

Q4: How is computed force determined?
A: It's calculated from flange forces in moment connections, considering load combinations (1.2D + 1.6L etc.).

Q5: What if my actual web depth is less than calculated?
A: You may need to add doubler plates, increase web thickness, or reconsider the connection design.