Stressed Skin Diaphragm

ENGINEERING – TRUCTURAL ENGINEERING — BEAM & FRAME CALCULATOR Stressed Skin Diaphragm A precise tool.
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What is the Stressed Skin Diaphragm & How does it work?

A diaphragm in a light‑frame wall resists lateral loads by transferring shear forces through the sheathing panels to the surrounding framing. The effectiveness of this action is quantified by the diaphragm’s shear stiffness, which depends on the material properties of the sheathing and the geometry of the panel.

The shear stiffness per unit width of a panel is proportional to the shear modulus of the sheathing material (Gs) and the thickness of the sheathing (t). Because the load is carried by the studs, the spacing between studs (s) reduces the effective shear area, making the stiffness inversely proportional to s.

For a panel of total width b, the overall diaphragm shear stiffness K (N/m) can be expressed as the product of the per‑unit‑width stiffness and the panel width. This relationship is captured in the formula below, which is the basis for the calculator.

K = frac{G_{s}, t, b}{s}
K = diaphragm shear stiffness (N/m)  |  Gs = shear modulus of sheathing (Pa)  |  t = sheathing thickness (m)  |  b = panel width (m)  |  s = stud spacing (m)
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Parameters
Result —
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Frequently Asked Questions
What is the formula for calculating shear stiffness per unit width of a panel?
The shear stiffness per unit width of a panel is proportional to the product of the shear modulus (Gs) and the thickness (t) of the sheathing material.
How does the geometry of the panel affect its shear stiffness?
While not directly mentioned in the context, the geometry of the panel can influence how effectively it transfers shear forces through the sheathing panels to the surrounding framing.
What is the role of the diaphragm in a light-frame wall?
The diaphragm resists lateral loads by transferring shear forces through the sheathing panels to the surrounding framing, ensuring structural integrity.
How does the material properties of the sheathing affect its performance?
The material properties, particularly the shear modulus (Gs) and thickness (t), significantly impact the diaphragm’s ability to resist lateral loads effectively.
Can this calculator be used for any type of wall construction?
This calculator is specifically designed for light-frame walls, which are typically constructed with wood or similar lightweight materials.
What factors should be considered when selecting the sheathing material for a diaphragm?
When selecting the sheathing material, consider its shear modulus and thickness to ensure adequate stiffness and performance under lateral loads.
How does the shear stiffness of a diaphragm impact the overall structural integrity of a building?
A higher shear stiffness in the diaphragm contributes to better overall structural stability, particularly in resisting wind or seismic forces.

Results are for informational purposes only and do not constitute professional advice.