Maximum Wind Moment for Vessel with Total Height Greater than 20m Calculator

Maximum Wind Moment Formula:

\[ M_w = P_{lw} \times \left(\frac{h_1}{2}\right) + P_{uw} \times \left(h_1 + \frac{h_2}{2}\right) \]

Wind Load (Lower Part):

Height (Lower Part):

Wind Load (Upper Part):

Height (Upper Part):

Tolerance:

Maximum Wind Moment:

1. What is Maximum Wind Moment for Tall Vessels?

Definition: This calculator computes the maximum wind-induced bending moment on tall vessels (height > 20m) considering separate wind loads on upper and lower sections.

Purpose: It helps structural engineers design vessels that can withstand wind forces without excessive deflection or stress.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ M_w = P_{lw} \times \left(\frac{h_1}{2}\right) + P_{uw} \times \left(h_1 + \frac{h_2}{2}\right) \]

Where:

\( M_w \) — Maximum wind moment (N·mm)
\( P_{lw} \) — Wind load on lower part (N)
\( h_1 \) — Height of lower part (mm)
\( P_{uw} \) — Wind load on upper part (N)
\( h_2 \) — Height of upper part (mm)

Explanation: The formula sums moments from both sections, with the upper part contributing more due to its higher lever arm.

3. Importance of Wind Moment Calculation

Details: Accurate wind moment calculation ensures vessel stability, prevents overturning, and helps determine proper foundation requirements.

4. Using the Calculator

Tips: Enter wind loads (N), heights (mm), and optional tolerance percentage. The calculator provides both nominal and tolerance-range results.

5. Frequently Asked Questions (FAQ)

Q1: Why separate calculations for upper and lower parts?
A: Wind pressure typically increases with height, so upper sections often experience greater loads per unit area.

Q2: What's a typical tolerance percentage?
A: ±5% is common for most engineering calculations, but this may vary based on project requirements.

Q3: How do I determine wind loads?
A: Wind loads are calculated based on wind speed, exposure category, and vessel geometry using standards like ASCE 7 or local codes.

Q4: Why is the upper part moment arm different?
A: The upper part's center of pressure is assumed at its mid-height, which is above the lower part's top.

Q5: What units should I use?
A: The calculator uses Newtons for force and millimeters for height, resulting in N·mm moments. Convert units as needed.