MOE Distribution in Visually graded Ponderosa Pine Lumber Harvested from Restoration Programs in Southern Oregon and Northern California

IF 0.8 4区工程技术 Q3 FORESTRY

Wood and Fiber Science Pub Date : 2022-06-03 DOI:10.22382/wfs-2022-10

Sina Jahedi, L. Muszynski, M. Riggio, Benjamin Brice Blengino, S. Bhandari

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引用次数: 2

Abstract

. Every year, restoration programs in Southern Oregon and Northern California produce large amounts of low-value ponderosa pine, Pinus ponderosa (PP) lumber. This material has a limited market in the United States. Engineered wood products, such as cross-laminated timber (CLT) and glulam, are expected to provide a value-added market to offset the high costs of restoration programs. However, restoration program lumber has larger amounts of juvenile wood and visual grades are reported to show lower mechanical properties compared with commercially harvested material, on which the National Design Speci ﬁ cation (NDS) design values are based. This research addresses a knowledge gap on the impact of juvenile wood and visual strength-affecting characteristics on the mechanical performance of PP lumber generated in the region of interest. The purpose of this study was to assess this impact based on dynamically measured MOE of samples of visually graded and ungraded restoration program PP lumber. The material used in this study was intended for fabrication of CLT for another project, hence it could not be used for destructive tests to measure MOR. The results were compared with previous studies and published values for commercially harvested PP as re ﬂ ected in the NDS Western Woods (WW) species group. The results show that characteristic MOE values of visual grade Nos. 1 and 2 of PP from restoration programs were lower than

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俄勒冈州南部和加利福尼亚州北部恢复项目中目测分级的松木材的MOE分布

．每年，俄勒冈州南部和加利福尼亚州北部的恢复计划都会生产大量低价值的黄松，即黄松(PP)木材。这种材料在美国的销路有限。工程木制品，如交叉层压木材(CLT)和胶合木，有望提供一个增值市场，以抵消修复计划的高成本。然而，与国家设计规范(NDS)设计值所依据的商业采伐材料相比，修复计划木材含有大量的幼木和视觉等级，显示出较低的机械性能。本研究解决了幼木和视觉强度影响特征对感兴趣地区产生的PP木材机械性能影响的知识差距。本研究的目的是基于动态测量的视觉分级和未分级修复方案PP木材样品的MOE来评估这种影响。本研究中使用的材料是用于另一个项目的CLT制造，因此不能用于破坏性测试来测量MOR。结果与以往的研究和已发表的商业采伐PP值进行了比较，反映在NDS西部森林(WW)种组中。结果表明:修复方案中1、2视觉等级PP的特征MOE值均低于

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来源期刊

Wood and Fiber Science 工程技术-材料科学：纺织

CiteScore

7.50

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： W&FS SCIENTIFIC ARTICLES INCLUDE THESE TOPIC AREAS: -Wood and Lignocellulosic Materials- Biomaterials- Timber Structures and Engineering- Biology- Nano-technology- Natural Fiber Composites- Timber Treatment and Harvesting- Botany- Mycology- Adhesives and Bioresins- Business Management and Marketing- Operations Research. SWST members have access to all full-text electronic versions of current and past Wood and Fiber Science issues.