Abstract: To meet the demands of large open spaces and flexible layouts in residential buildings, the special-shaped column structure system has undergone significant development in China, from initial research to mature application. However, existing studies have mainly focused on reinforced concrete materials, with insufficient exploration of new composite special-shaped columns. Therefore, this paper proposes a new L-shaped aluminum alloy square tube-wood-concrete composite special-shaped column structure. Through axial compression tests, it is found that the failure mode is mainly strength failure. Then, based on the test results of the special-shaped columns, a finite element model is established for simulation analysis. Finally, the test results are compared with the finite element results to verify the accuracy of the finite element model. Using the verified finite element calculation model, the influence of the wall thickness and the slenderness ratio of the aluminum alloy square tube on the axial compression performance of the column is analyzed. The research results show that with the increase of the wood content, the bearing capacity first increases and then decreases, and when the wood content is 24%, the synergy effect of the three materials is better. The bearing capacity is the largest when the wall thickness of the aluminum alloy is 6mm, which is 21.9% higher than that of the specimen with a 3mm wall thickness. Compared with other parameters, the slenderness ratio has the greatest influence on the bearing capacity of the L-shaped composite special-shaped column.

Key words: L-shaped combined irregular column, axial compression performance, wood content rate, finite element simulation

摘要： 为适应住宅建筑对大开间、灵活空间的需求,异形柱结构体系在我国经历了从初步研究到成熟应用的显著发展。然而,现有研究多集中于钢筋混凝土材料,对新型组合异形柱的探索不足。为此本文提出了一种新型L形铝合金方管-木-混凝土组合异形柱结构,通过轴压试验发现其破坏形式主要为强度破坏,然后基于异形柱的试验结果建立有限元模型进行模拟分析,最后将试验结果与有限元结果进行对照,验证了有限元模型的准确性,并采用验证后的有限元计算模型,分析铝合金方管壁厚和长细比对柱轴压性能的影响。研究结果表明:随着含木率的增加,承载力出现了先增加后减小的趋势,且当含木率为24%时,3种材料的协同效果较好。铝合金壁厚为6mm时的承载力最大,对比3mm壁厚的试件承载力提升了21.9%。相较于其他参数,长细比对L形组合异形柱的承载力影响效果最大。

关键词: L形组合异形柱, 轴压性能, 含木率, 有限元模拟