6082-T6铝合金构件受弯承载力计算方法

Calculation method of bending strength for 6082-T6 aluminum alloy beams

为获得6082-T6铝合金箱型截面构件受弯承载力的计算方法,通过24个材性试验和19根箱型截面构件三点弯曲试验结果,在ABAQUS有限元模型获得弯曲试验结果验证的基础上,对468根铝合金三点弯曲构件进行数值模拟分析.鉴于现行美国、欧洲和中国铝合金设计规范在计算受弯构件的承载力时,均未考虑板组效应的影响,且计算过程繁琐,结果相对保守,针对6082-T6铝合金箱型截面受弯构件,基于直接强度法,提出了考虑材料非线性特征和构件初始缺陷的受弯承载力计算方法.最后,将本文提出方法的计算结果与试验数据及各国规范计算结果进行对比,结果表明:本文提出的计算方法具有较高精度,且使用简便,可较好预测6082-T6铝合金箱型截面三点弯曲构件的受弯承载力.

To predict the bending strength of 6082-T6 aluminum alloy flexural members,experimental studies of24 tensile coupon tests and 19 three-point bending tests of box-section were performed. Finite element models using ABAQUS were developed and verified against the test results of 19 beams,and then used to perform parametric studies,in which a total of 468 numerical results were generated. The experimental and numerical results were used to evaluate the bending resistance provisions of the current American,European and Chinese Specifications. The impact of plate-assembly effect was not considered in these three specifications,which made the calculating process lightly complicated and the results relatively conservative. Based on direct strength method,the calculation method of bending strength considering the material nonlinear characteristics and initial geometric imperfection was proposed for 6082-T6 aluminum alloy bending members with box-section. Compared with the results of experimental data and three design specifications,it shows that the proposed calculation method is more accurate and convenient in predicting the bearing capacity of 6082-T6 aluminum alloy three-point bending beams of box-section.