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30 cze 2022 · Use this wood beam span calculator to check a wood beam of a particular size and length to see if it can support a given uniform linear load by comparing its allowable and required bending and shear stress.
- Beam Load
Our calculator is easy and simple to use. All you have to do...
- Beam Deflection Calculator
That's because we can consider the beam to bend vertically...
- Shear Stress Calculator
When we apply a transverse load to a beam, transverse and...
- Young's Modulus Calculator
To calculate the modulus of elasticity E of material, follow...
- Section Modulus Calculator
To calculate the section modulus of a pipe pile of thickness...
- Beam Load
The listed dry sizes are based on lumber at 19 percent maximum moisture content. Since the change in dimension that occurs in wet service conditions has already been accounted for in the fully adjusted design value, tabulated spans are applicable to lumber in dry or wet service conditions. 5.AN MEASUREMENT SP
The simplified span tables which appear in this booklet have been prepared by the Pacific Lumber Inspection Bureau to facilitate the use and specification of selected imported softwood species in common joist and rafter installations for light frame construction.
A complete analysis of wood’s mechanical properties is complex, but understanding a few basics of lumber strength will allow you to size joists and rafters with the use of span tables. Let’s start by taking a broad view.
Selected lumber design values and span tables for these species groups are provided in this publication. Comprehensive information for Western species lum-ber products (Douglas Fir-Larch, Douglas Fir South, Hem-Fir, Spruce-Pine-Fir South, Western Cedars and Western Woods) can be found at www.wwpa.org.
Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded and mechanically graded dimension lumber.
Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. These tables provide maximum spans for the #2 grades of four common species of lumber (Southern Pine, Douglas Fir, Hem-fir, and Spruce-pine-fir (SPF). Determine Maximum Joist and Rafter Spans.
