1. What is Web Thickness for Given Stress?

Definition: This calculator determines the required web thickness in an I-section beam to withstand a given concentrated load and compressive stress.

Purpose: It helps structural engineers ensure beam webs are properly sized to handle reaction forces without excessive compressive stress.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( t_w \) — Web thickness (meters)
• \( R \) — Concentrated load of reaction (Newtons)
• \( f_a \) — Allowable compressive stress (Pascals)
• \( N \) — Bearing or plate length (meters)
• \( k \) — Distance from flange to web fillet (meters)

Explanation: The formula distributes the reaction load over an effective bearing area to determine the required web thickness.

3. Importance of Web Thickness Calculation

Details: Proper web thickness prevents web buckling, crushing, and ensures structural integrity under concentrated loads.

4. Using the Calculator

Tips: Enter the concentrated load, compressive stress, bearing length, and flange-to-web distance. The tolerance field (default ±5%) shows acceptable thickness variations.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for web thickness?
A: Web thickness typically ranges from 6mm to 50mm depending on the beam size and loading conditions.

Q2: How does bearing length affect web thickness?
A: Longer bearing lengths distribute the load over a greater area, reducing the required web thickness.

Q3: When would I adjust the tolerance?
A: Adjust tolerance based on manufacturing capabilities and safety factors required for your specific application.

Q4: What happens if the web is too thin?
A: A too-thin web may buckle or crush under concentrated loads, leading to structural failure.

Q5: How do I determine the compressive stress value?
A: Compressive stress is typically specified in design codes based on material properties and safety factors.

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