国产701铝合金L形轴压构件承载性能研究

Research on the Performance of Domestic 701 Aluminum Alloy L-shaped Members Under Axial Compression

国产701铝合金是一种新型铝合金材料,相较于传统的6061-T6铝合金,其强度更高,也具有较好的延性,在塔架中有着广泛的应用前景。首先完成了24根国产701铝合金L形截面轴压构件承载力试验,得到了构件的极限承载力和破坏模式。随后建立了数值分析模型,并通过试验验证了数值模型的正确性。基于所建立的数值模型,完成了大量数值分析,并得到了长细比、截面规格、初始弯曲等因素对构件承载力的影响规律。最后,将试验实测稳定系数和现有规范公式计算得到的稳定系数进行比较,对比结果表明,国产701铝合金L形轴压构件的整体稳定承载力可以采用我国《铝合金结构设计规范》(GB 50429—2007)中的公式进行计算。

The domestic 701 aluminum alloy is a new aluminum alloy with excellent mechanical performance.Compared with traditional 6061-T6 aluminum alloy,701 aluminum alloy has a higher strength and better ductility.Therefore,the 701 aluminum alloy has a broad application prospect in towers.Firstly,in this paper,the tests are completed on 24 columns made of 701 aluminum alloys with L-section,and the ultimate axial compression bearing capacity and failure modes of the specimens are obtained.Then,numerical models are built and verified by using experimental results.Based on the numerical models,a large number of FE models are analyzed considering the parameters such as slenderness ratio,sectional dimension and initial curvature.Finally,the stability coefficients obtained from the numerical analysis are compared with those calculated using existing standards.The comparison results show that the overall stability bearing capacity of the 701 aluminum alloys with L-section can be calculated by the formula recommended in the Code for Design of Aluminum Structures(GB 50429—2007).