Axial Bending Stress due to Wind Load at Base of Vessel Calculator

Axial Bending Stress Formula:

\[ f_{wb} = \frac{4 \times M_w}{\pi \times D_{sk}^2 \times t_{sk}} \]

Maximum Wind Moment (M_w):

N·m

Mean Diameter of Skirt (D_sk):

Thickness of Skirt (t_sk):

Tolerance:

% (±5%)

Axial Bending Stress (f_wb):

1. What is Axial Bending Stress at Base of Vessel?

Definition: Axial Bending Stress at Base of Vessel refers to the stress that occurs when wind exerts a force on the vessel, causing it to bend or deform.

Purpose: This calculation is crucial for ensuring structural integrity of pressure vessels and tall equipment under wind loads.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ f_{wb} = \frac{4 \times M_w}{\pi \times D_{sk}^2 \times t_{sk}} \]

Where:

\( f_{wb} \) — Axial bending stress (N/mm²)
\( M_w \) — Maximum wind moment (N·m)
\( D_{sk} \) — Mean diameter of skirt (mm)
\( t_{sk} \) — Thickness of skirt (mm)

Explanation: The formula calculates the stress caused by wind-induced bending moments at the base of a vessel.

3. Importance of Axial Bending Stress Calculation

Details: Proper calculation ensures vessel stability under wind loads and prevents structural failure. It's critical for safety and regulatory compliance.

4. Using the Calculator

Tips: Enter the maximum wind moment, skirt diameter and thickness. The tolerance field (default ±5%) helps account for variations in material properties and loading conditions.

5. Frequently Asked Questions (FAQ)

Q1: How is maximum wind moment determined?
A: Maximum wind moment is calculated based on wind speed, structure size/shape, and exposure factors per engineering standards.

Q2: What's a typical skirt thickness range?
A: Skirt thickness typically ranges from 10-50mm depending on vessel size and design requirements.

Q3: Why include a tolerance percentage?
A: The tolerance accounts for uncertainties in wind loading, material properties, and construction variations.

Q4: What units should I use?
A: Use consistent units: N·m for moment, mm for dimensions. Results are in N/mm² (MPa).

Q5: How does this relate to vessel design?
A: This stress must be combined with other stresses (pressure, weight) and kept below allowable limits for the material.