闭口加劲薄壁铝合金轴压构件局部屈曲性能试验研究

发布时间：2018-10-18 21:21

【摘要】：进行了6个国产6063-T5铝合金试样拉伸试验,测得其应力-应变关系曲线,并与Ramberg-Osgood模型进行了对比。结果表明,Ramberg-Osgood模型可较准确描述国产6063-T5铝合金材料的力学性能。通过对4种截面类型共10根闭口加劲薄壁国产6063-T5铝合金试件进行轴压试验,获得了各试件荷载-轴向位移曲线、荷载-板件平面外变形曲线以及荷载-应变曲线,得到其承载力和破坏形态。结果表明,各试件均发生局部屈曲与塑性屈服耦合破坏。采用有限元分析方法对试件进行模拟,模拟结果与试验结果的对比表明,所建立的有限元模型可以较准确预测铝合金试件的承载力和破坏形态。采用现行美国、欧洲、中国的铝合金结构设计规范、美国冷弯薄壁钢结构设计规范及直接强度法对所研究试件的承载力进行计算,计算结果与试验结果的对比表明,各规范设计方法基本适用于闭口加劲薄壁铝合金轴压构件局部屈曲设计。直接强度法计算结果与实测承载力比值约为1.20,表明目前直接强度法高估了闭口加劲薄壁截面铝合金轴压构件承载力,因此需对其修正才可用于该类闭口加劲薄壁截面铝合金轴压构件的承载分析。
[Abstract]:The stress-strain curves of six domestic 6063-T5 aluminum alloy specimens were measured and compared with the Ramberg-Osgood model. The results show that the Ramberg-Osgood model can accurately describe the mechanical properties of domestic 6063-T5 aluminum alloy materials. Through axial compression tests on 10 closed thin-walled 6063-T5 aluminum alloy specimens of four cross-section types, load-axial displacement curves, load-plate out-of-plane deformation curves and load-strain curves were obtained. The bearing capacity and failure form are obtained. The results show that the local buckling and plastic yield coupling failure occur in all specimens. The finite element analysis method is used to simulate the specimens. The comparison between the simulation results and the test results shows that the finite element model can accurately predict the bearing capacity and failure morphology of aluminum alloy specimens. The bearing capacity of the studied specimens is calculated by using the current American, European and Chinese codes for the design of aluminum alloy structures, the design code for cold-formed thin-walled steel structures in the United States and the direct strength method. The comparison between the calculated results and the test results shows that, The design methods are suitable for the local buckling design of closed stiffened thin-walled aluminum alloy members under axial compression. The ratio between the calculated results of direct strength method and the measured bearing capacity is about 1.20, which indicates that the direct strength method overestimates the bearing capacity of closed thin-walled aluminum alloy members. Therefore, it needs to be modified to analyze the bearing capacity of this kind of closed thin-walled aluminum alloy members.
【作者单位】：山东大学土建与水利学院;山东泰鹏集团有限公司;
【基金】：山东大学自主创新基金项目(2014HW013)
【分类号】：TU395

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