技术说明:长期暴露在室外对工字托梁性能的影响

IF 0.8 4区工程技术 Q3 FORESTRY

Wood and Fiber Science Pub Date : 2020-07-27 DOI:10.22382/wfs-2020-030

D. Way, J. Morrell, Arijit Sinha

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引用次数: 2

摘要

使用木复合材料制造的I型托梁适用于干燥使用条件。当工字梁暴露在过度的天气条件下时，就会出现这种情况。这种暴露在潮湿环境中会降低I型托梁的结构性能。在之前发表的一项研究（King等人，2014）的后续研究中，该研究着眼于短期暴露于水分（138天），该研究将暴露天数进一步延长至1351天（约3.5年），以深入了解性质变化并微调King等人（2014）提出的降解模型。长期暴露于外部与最大负荷和最大负荷下挠度的持续下降有关，但随着暴露时间的延长，财产损失率降低。腹板和腹板法兰接头处的弯曲失效模式从腹板屈曲转回剪切型失效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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TECHNICAL NOTE: Effects of Long-term Outdoor Exposure on Properties of I-joists

I-joists manufactured using wood composites are intended for dry service condition. Situations arise where I-joists are exposed to excessive weather conditions. This exposure to moisture can degrade structural properties of I-joists. In a follow-up to a previous published study (King et al 2014) looking at the short-term exposure to moisture (138 d), this study extends the exposure days further to 1351 d (approx. 3.5 yr) to gain an insight into property changes and fine-tune the degradation model presented by King et al (2014). Long-term exterior exposure was associated with continued declines in maximum load and deflection at maximum load, but the rate of property loss decreased as the exposure period was extended. Bending failure modes shifted back from web buckling to shear type failures at the web-web and web-flange joints.

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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.