Bather, Mike 
ORCID: 0000-0002-6725-6815
(2022)
Technical note on the determination of strength reduction factors using ASTM D245.
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Technical note on SRs using ASTM D245.pdf - Unspecified Available under License Creative Commons Attribution Non-commercial. Download (190kB) | Preview |
Abstract
The US standard ‘Establishing Structural Grades and Related Allowable Properties for Visually Graded Lumber’ ASTM D245 is based on the assumption that knots act as voids and presents a simplified way to account for the reductions in bending capacity due to these voids. It is worthwhile considering the equations given in the code and comparing them with a similar approach based on first principles. The first principles approach compares (i) reduced sections with knots with (ii) entire sections without knots. The basis for the comparisons is their elastic section moduli, assuming that knots can transmit zero tension forces and so act as voids below the neutral axis. It is assumed that knots can transmit compressive forces, which would be above the neutral axis for a typical timber joist in normal vertical bending.
| Item Type: | Report |
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| Uncontrolled Keywords: | in situ timber, structural timber, strength reduction, SR, mechanical properties, physical properties, timber |
| Divisions: | Faculty of Science and Engineering > School of Engineering |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 14 Jan 2022 11:20 |
| Last Modified: | 18 Jan 2023 21:16 |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3146813 |
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