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,截面为H350×200×10×12,弯曲圆弧半径为2850 mm,两端截面中心跨度为2936 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。
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 2850 mm,the span is 2936 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 flex
作者
孙国军
秦太晏
吴金志
罗强
孙伟东
Guojun Sun;Taiyan Qin;Jinzhi Wu;Qiang Luo;Weidong Sun(Beijing University of Technology,Beijing 100124,China;Beijing Construction Engineering Group Co.,Ltd.,Beijing 100015,China)
出处
《钢结构（中英文）》
2024年第9期34-42,共9页
Steel Construction（Chinese & English）
关键词
无肋H型弯扭铝合金构件
轴压性能
破坏模式
极限承载力
H-type bending-torsion aluminum alloy member
axial compression performance
failure mode
ultimate bearing capacity
