Thickness of Column Web given Cross-Sectional Area of Column Web Stiffeners Calculator

Column Web Thickness Formula:

\[ t_{wc} = \frac{P_{bf} - (A_{cs} \times F_{yst})}{F_{yc} \times (t_f + 5 \times K)} \]

Computed Force (P_bf):

Cross Sectional Plate Area (A_cs):

m²

Stiffener Yield Stress (F_yst):

MPa

Column Yield Stress (F_yc):

MPa

Flange Thickness (t_f):

Distance Between Flange and Web (K):

Tolerance:

Column Web Thickness (t_wc):

1. What is Column Web Thickness Calculator?

Definition: This calculator determines the required thickness of a column web based on the cross-sectional area of column web stiffeners and other parameters.

Purpose: It helps structural engineers ensure proper design of column web stiffeners to prevent local buckling and maintain structural integrity.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ t_{wc} = \frac{P_{bf} - (A_{cs} \times F_{yst})}{F_{yc} \times (t_f + 5 \times K)} \]

Where:

\( t_{wc} \) — Column web thickness (mm)
\( P_{bf} \) — Computed force delivered by the flange (kN)
\( A_{cs} \) — Cross sectional plate area (m²)
\( F_{yst} \) — Stiffener yield stress (MPa)
\( F_{yc} \) — Column yield stress (MPa)
\( t_f \) — Flange thickness (mm)
\( K \) — Distance between flange and web (mm)

Explanation: The formula calculates the minimum required web thickness considering the forces, material properties, and geometric parameters.

3. Importance of Column Web Thickness Calculation

Details: Proper web thickness ensures the column can withstand the applied loads without excessive deformation or failure, particularly at connection points.

4. Using the Calculator

Tips: Enter all required parameters including computed force, cross-sectional area, yield stresses, flange thickness, and distance between flange and web. The tolerance field (default ±5%) allows for manufacturing variations.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical tolerance for column web thickness?
A: Standard tolerance is ±5%, but this may vary based on project specifications and manufacturing capabilities.

Q2: How is the computed force (P_bf) determined?
A: It's calculated from the flange of a moment connection plate multiplied by 5/3 (for dead and live loads) or 4/3 (when including wind/earthquake forces).

Q3: What if my calculated web thickness is too large?
A: Consider increasing the stiffener area or using higher strength materials to reduce the required web thickness.

Q4: How does distance between flange and web affect the calculation?
A: Larger distances increase the denominator, resulting in smaller required web thickness, up to practical limits.

Q5: Can this calculator be used for all column types?
A: It's primarily for I-sections and similar built-up columns with stiffeners. Other sections may require different calculations.