1. What is Lift per Unit Span?

Definition: Lift per unit span measures the distributed lift force along the length of a structural element, expressed in Newtons per meter (N/m).

Purpose: This calculation helps structural engineers analyze and design building components that experience lift forces, such as roofs or cantilevered structures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L_{span} \) — Lift per unit span (N/m)
• \( L \) — Total lift force (N)
• \( S \) — Span length (m)

Explanation: The total lift force is divided by the span length to determine the distributed load per meter.

3. Importance of Lift per Unit Span Calculation

Details: Accurate calculation ensures structural elements can withstand uplift forces from wind, seismic activity, or other dynamic loads without failure.

4. Using the Calculator

Tips: Enter the total lift force in Newtons and span length in meters. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical value for lift per unit span?
A: Values vary widely based on structure type and location, but residential roofs might experience 200-500 N/m in moderate wind conditions.

Q2: How do I determine total lift force?
A: Total lift can be calculated from wind pressure, building geometry, and applicable building codes for your region.

Q3: Does this account for safety factors?
A: No, the calculator provides theoretical values. Always apply appropriate safety factors per your design standards.

Q4: Can this be used for aircraft wings?
A: The same principle applies, though aerospace applications typically use different terminology and additional considerations.

Q5: What if my span has variable lift distribution?
A: This calculator assumes uniform distribution. For non-uniform cases, more complex analysis is required.