地震应变速率对落叶松、蒙古松和白杨垂直颗粒压缩行为的影响:试验和应力-应变模型

IF 2.2 3区 农林科学 Q2 FORESTRY Holzforschung Pub Date : 2023-04-14 DOI:10.1515/hf-2022-0135
Lipeng Zhang, Qifang Xie, Yajie Wu, Baozhuang Zhang, Ningfen Su
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引用次数: 0

摘要

摘要在中国传统木结构的许多关键部位,如榫卯和斗拱节点,木材主要承受横向压缩。地震是这些结构所面临的动力作用之一,它将使木材承受比准静态载荷更高的加载速度。研究木材在垂直压粒作用下的地震应变率(SSRs)效应非常重要。以大湖落叶松、油松和白杨为原料,制备了144个径向小清木标本。在3种SSRs(10−3 s−1、10−2 s−1和10−1 s−1)和准静态应变率(10−4 s−1)下进行单调和循环压缩试验。分析了试件的破坏模式、应力-应变曲线、屈服强度、弹性模量和卸载/再加载模量。结果表明,无论是单调压缩还是循环压缩,PTGc的性能都对SSRs高度敏感。强度对ssr的敏感性高于弹性模量。木材在循环压缩下的SSRs效应比单调压缩下的SSRs效应具有更大的变异性。卸载/重新加载模量在统计上没有明显的SSR效应。将现有的PTG与平行晶粒试验结果进行了比较,得到了拟合的一般表达式。在此基础上,提出了基于ssr的应力-应变模型,并进行了试验验证。
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Effects of seismic strain rates on the perpendicular-to-grain compression behaviour of Dahurian larch, Mongolian pine and Chinese poplar: tests and stress-strain model
Abstract Wood is mainly subjected to transverse compression in many critical parts of Chinese traditional timber structures, e.g. the mortise-tenon and Dou-Gong joints. Seismic is one of the dynamic actions faced by these structures and will cause wood to suffer higher loading speeds than quasi-static loads. The investigation of the seismic strain rates (SSRs) effects of wood under perpendicular-to-grain compression (PTGc) is important. One hundred and forty-four radial small clear wood specimens were prepared using Dahurian larch, Mongolian pine and Chinese poplar. Monotonic and cyclic compression tests were conducted under three SSRs (10−3 s−1, 10−2 s−1, and 10−1 s−1) and the quasi-static strain rate (10−4 s−1). Failure modes, stress-strain curves, yield strengths, elastic moduli and the unloading/reloading moduli were analyzed. Results indicated that the PTGc properties were highly sensitive to SSRs under both the monotonic and cyclic compression. Strengths showed higher sensitivity to SSRs than elastic moduli. The SSRs effects of wood under cyclic compression have greater variability than the monotonic counterparts. The unloading/reloading moduli shows little SSR effects statistically. Comparisons were made between the existing PTG and the parallel-to-grain test results and a fitted general expression was obtained. Furthermore, an SSR-dependent stress-strain model was proposed and verified by tests.
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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