无肋H型弯扭铝合金构件轴压力学性能研究

孙国军; 秦太晏; 吴金志; 罗强; 孙伟东

doi:10.13206/j.gjgS24012901

无肋H型弯扭铝合金构件轴压力学性能研究

doi: 10.13206/j.gjgS24012901

1. 北京工业大学, 北京 100124;
2. 北京建工集团有限责任公司, 北京 100015

详细信息

作者简介:
孙国军,博士,副教授,主要从事钢结构与空间结构方面的研究。Email: sunguojun@bjut.edu.cn

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出版历程
- 收稿日期: 2024-01-29
- 网络出版日期: 2024-09-19

Study on Axial Compression Performance of H-Type Bending-Torsion Aluminum Alloy Member Without Ribs

1. Beijing University of Technology, Beijing 100124, China;
2. Beijing Construction Engineering Group Co., Ltd., Beijing 100015, China

摘要

摘要: 为了研究无肋H型弯扭铝合金构件的轴压力学性能，对1根H型弯扭铝合金构件进行了轴压试验。该构件通过H型截面绕一段圆弧线扫掠扭转得到，截面尺寸为H350×200×10×12，弯曲圆弧半径为2 850 mm，两端截面中心跨度为2 936 mm，两端截面相对扭转角度为26°，材料为6061-T6铝合金型材，边界条件为两端铰接。首先为了获得无肋H型弯扭铝合金构件精确几何模型，对构件整体进行三维扫描，得到了构件外表面云点数据，将云点数据与理想几何模型进行对比发现:整体几何偏差大部分控制在3 mm以内，但构件上翼缘厚度和宽度均不同程度小于理想几何模型；然后通过轴压试验得到了轴压构件的荷载-位移曲线、荷载-应变曲线及破坏模式，该H型弯扭铝合金构件极限承载力为313 kN，在构件的下翼缘和靠近下翼缘的腹板处出现严重波曲变形；最后根据三维扫描数据逆处理得到构件精确几何模型，在此基础上通过ABAQUS建立了有限元模型，通过数值分析得到了构件的应力发展变化规律及失效机理，铝合金构件的破坏模式、荷载-位移曲线和荷载-应变曲线均与试验吻合较好，验证了有限元模拟的可靠性，在达到极限承载力之前构件下翼缘和腹板大面积受压屈服进入塑性，构件整体发生弯扭屈曲失稳破坏。
- 无肋H型弯扭铝合金构件 /
- 轴压性能 /
- 破坏模式 /
- 极限承载力
Abstract: In order to study the axial compression of H-shaped bending-torsion aluminum alloy members, an axial compression test was carried out on an H-shaped flexural-torsional aluminum alloy member, which was obtained by sweeping and twisting the H-shaped section around a section of arc. The cross section design size is H350×200×10×12, the bending arc radius is 2 850 mm, the span is 2 936 mm, the torsion angle is 26°, the material is 6061-T6 aluminum alloy profile, and the boundary condition is hinged at both ends. Firstly, in order to obtain the accurate geometric model of H-type bending and torsion aluminum alloy member, the whole component is scanned in three dimensions, and the cloud point data of the outer surface of the component are obtained. By comparing the cloud point data with the ideal geometric model, it is found that most of the overall geometric deviation is controlled within 3 mm, and the thickness and width of the upper flange of the component are less than the ideal geometric model to varying degrees. Then, the load-displacement curve, load-strain curve and failure mode of the component are obtained through the axial compression test. The ultimate bearing capacity of the H-type bending-torsion aluminum alloy member is 313 kN, and finally the lower flange of the member and the web near the lower flange appear serious buckling deformation. Finally, the accurate geometric model of the component is obtained according to the inverse processing of the three-dimensional scanning data. On this basis, the finite element model is established by ABAQUS. The stress development and failure mechanism of the component are obtained by numerical analysis. The failure mode, load-displacement curve and load-strain curve of the aluminum alloy component are in good agreement with the test, which verifies the reliability of the finite element simulation. Before reaching the ultimate bearing capacity, the lower flange and web of the component are subjected to large-scale compression and yield into plasticity, and the failure mode of the component is flexural-torsional buckling failure.
- H-type bending-torsion aluminum alloy member /
- axial compression performance /
- failure mode /
- ultimate bearing capacity

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