薄壁铝合金轴压构件承载力计算的直接强度法

Direct strength method for calculation of the bearing capacity of thin-wall aluminum alloy members under axial load

采用Schafer B W教授提出的直接强度法研究薄壁铝合金轴压构件承载力计算问题,并给出实用的建议设计公式。根据铝合金构件的特性指出采用有效截面理论计算薄壁铝合金轴压构件承载力时存在复杂截面难以计算、计算必须迭代和无法分析构件畸变屈曲的缺陷,分析薄壁铝合金轴压构件的屈曲模式,给出各种屈曲模式下适合铝合金构件的屈曲荷载的计算方法。提出基于直接强度法的薄壁铝合金轴压构件承载力计算公式。利用试验数据和经试验数据验证的有限元计算结果与提出的建议计算公式的计算结果比对,验证了建议公式的正确性。此外,对照Eindhoven大学的铝合金槽形截面构件轴压试验数据,与现行欧洲铝合金规范计算结果比对,证明比现行欧洲铝合金规范计算公式更合理。

The direct strength method （DSM） by B.W. Schafer is employed to calculate the bearing capacity of thin-wall aluminum members under axial load, and design formulas are proposed. The effective section theory is not suitable for the analysis of thin-wall aluminum alloy members because of the difficulties in handling complex cross section, iterative calculation and distortion buckling. Buckling models of aluminum alloy members under axial force are analyzed, and relevant buckling load formulas presented. Design formulas based on the DSM for calculating the bearing capacity of thin-wall aluminum alloy members under axial force are proposed and verified by comparing with experimental and the finite element results. By comparing the results from the proposed design formulas with those from Eurocode and the test results of Eindhoven University, it can be found that the proposed design formulas can provide more reasonable values of the bearing capacity of thin-wall aluminum members than the current Euro code formulas.