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Glulam Beam Size Formula:
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Glulam beam size calculation determines the appropriate dimensions of glued laminated timber beams for deck construction based on load, span, and material stress requirements. It ensures structural integrity and safety.
The calculator uses the beam bending formulas:
Where:
Explanation: The first equation calculates the maximum bending moment for a simply supported beam with uniform load. The second equation determines the required section modulus to resist that moment.
Details: Proper beam sizing is crucial for structural safety, preventing excessive deflection, and ensuring the deck can support intended loads without failure.
Tips: Enter load in pounds per square foot (psf), span in feet (ft), and allowable stress in pounds per square inch (psi). All values must be positive numbers.
Q1: What is a typical allowable stress for glulam beams?
A: Allowable bending stress for glulam beams typically ranges from 1,800 to 2,400 psi, depending on the species and grade of wood.
Q2: How do I convert total load to psf?
A: Divide the total load by the area the beam supports. For deck beams, this is usually half the joist span on each side.
Q3: What safety factors should be considered?
A: Building codes typically require a safety factor of 1.5-2.0. Always consult local building codes and a structural engineer for final design.
Q4: Can this calculator be used for other beam types?
A: The formulas are general for simply supported beams, but material properties and design considerations may differ for steel, concrete, or other materials.
Q5: How does beam depth affect section modulus?
A: Section modulus increases with the square of beam depth, making deeper beams much more efficient at resisting bending moments.