Data Source and Methodology
All calculations are based strictly on the formulas and data provided by the NDS/SDPWS standards. For detailed guidance, refer to the specific sections of the NDS/SDPWS documentation.
The Formula Explained
Deflection: \( \delta = \frac{5wL^4}{384EI} \)
Shear Demand: \( V = wL \)
Glossary of Variables
- Span Length (ft): The length of the diaphragm span.
- Uniform Load (psf): The load distributed evenly across the diaphragm.
- Shear Capacity (plf): The shear capacity of the diaphragm.
- Deflection (inches): The displacement under load.
- Shear Demand (plf): The shear force demand on the diaphragm.
How It Works: A Step-by-Step Example
Consider a diaphragm with a span length of 20 ft, a uniform load of 50 psf, and a shear capacity of 100 plf. Using the formulas provided, you can calculate the deflection and the shear demand to determine compliance with the NDS/SDPWS standards.
Frequently Asked Questions (FAQ)
What is a wood diaphragm?
A wood diaphragm is a structural element used in construction to resist lateral forces, typically in buildings.
How do I determine the shear capacity?
The shear capacity can be determined from material specifications and design codes such as the NDS/SDPWS.
What is the importance of deflection in diaphragm design?
Deflection is crucial as excessive deflection can lead to structural failures or serviceability issues.
How often should a diaphragm design be reviewed?
Diaphragm designs should be reviewed whenever there are changes in load conditions or structural modifications.
What standards govern diaphragm design?
The NDS/SDPWS standards provide guidelines for diaphragm design in wood structures.
Formula (LaTeX) + variables + units
','
Deflection: \( \delta = \frac{5wL^4}{384EI} \) Shear Demand: \( V = wL \)
- No variables provided in audit spec.
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - FTC — Consumer advice — consumer.ftc.gov · Accessed 2026-01-19
https://consumer.ftc.gov/
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.