Experimental Study and Finite Element Analysis of Wood-Plastic Composite Hollow Columns Subjected to Axial Compression

GAO Fei; LI Yuyu; HE Wenhui; HAO Xiaolong; OU Rongxian; WANG Qingwen

doi:10.12326/j.2096-9694.2024044

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Experimental Study and Finite Element Analysis of Wood-Plastic Composite Hollow Columns Subjected to Axial Compression
1.Institute of Biomass Engineering，Key Laboratory of Energy Plants Resource and Utilization（Ministry of Agriculture and Rural Affairs），South China Agricultural University，Guangzhou 510642，Guangdong，China
2.Key Laboratory for Biobased Materials and Energy of Ministry of Education，South China Agricultural University，Guangzhou 510642，Guangdong，China
3.College of Water Conservancy and Civil Engineering，South China Agricultural University，Guangzhou 510642，Guangdong，China
4.School of Civil Engineering & Transportation，South China University of Technology， Guangzhou 510641，Guangdong，China
Vol. 38, Issue 3, Pages: 40-48(2024)
DOI： 10.12326/j.2096-9694.2024044
稿件说明：

移动端阅览

高飞,李俞谕,何文辉等.木塑空心柱轴压力学性能试验与有限元分析[J].木材科学与技术,2024,38(03):40-48. DOI： 10.12326/j.2096-9694.2024044.

GAO Fei,LI Yuyu,HE Wenhui,et al.Experimental Study and Finite Element Analysis of Wood-Plastic Composite Hollow Columns Subjected to Axial Compression[J].Chinese Journal of Wood Science and Technology,2024,38(03):40-48. DOI： 10.12326/j.2096-9694.2024044.

摘要

为探究木塑复合材料用作低密度装配式建筑承重柱的可行性，通过材性测试和轴压试验评估共挤出木塑空心柱的轴压力学性能，并利用ABAQUS有限元分析软件模拟探究木塑空心柱壁厚、长细比和内置薄壁圆钢管壁厚对其极限承载力、变形能力和破坏模式的影响。模拟分析结果与试验测试数据高度一致，验证了模拟方法的有效性。试验研究表明，木塑空心柱主要通过局部压溃破坏，并表现出明显的弹塑性阶段。有限元分析结果表明，增加壁厚能提高木塑空心柱的初始刚度和极限承载力，其中8 mm厚度在成本、重量及承载能力方面具有最佳性价比。随着长细比的增加，木塑空心柱的承载力和刚度逐渐降低，破坏模式也从强度破坏转向失稳破坏。内置3 mm薄壁钢管显著增强了木塑空心柱的承载力和延性，其力学性能能够满足建筑对抗压承重构件的要求。

Abstract

This study investigated the feasibility of using wood-plastic composites (WPCs) for load-bearing columns in low-density prefabricated houses. Co-extruded WPC hollow columns were evaluated through material property and axial compression tests. The effects of wall thickness

aspect ratio

and the thickness of embedded thin-walled steel tubes on the ultimate load-bearing capacity

deformability

and failure modes of WPC hollow columns were analyzed using ABAQUS software. The simulation results were highly consistent with the experimental test data

validating the effectiveness of the modeling approach. The experiment’s results showed that the primary failure mode of the columns was localized buckling and a significant elastoplastic behavior was observed in the later stages of compression. Finite element analysis indicated that an increase in wall thickness improved both the initial stiffness and the ultimate load-bearing capacity of the columns

with an 8 mm thickness improvement to be the most cost-effective in terms of cost

weight

and load-bearing capacity. As the aspect ratio increased

there was a gradual decrease in both the load-bearing capacity and stiffness of the columns

with a shift in failure mode from strength failure to buckling. Integrating a 3 mm thin-walled steel tube significantly enhances the load-bearing capacity and ductility of the hybrid columns

making the mechanical properties suitable for use as compressive load-bearing members in building structures.

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references

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