中文摘要：

铝合金薄腹板梁在受剪时腹板很容易发生屈曲,但是在翼缘和加劲肋的约束下,腹板中可以产生相当可观的屈曲后强度。该文介绍了几种常见的计算铝合金薄腹板梁抗剪强度的理论方法,结合国外学者完成的铝合金梁抗剪试验评价各种方法的优劣。对于其中较为准确的旋转应力场法进行了讨论,说明了其中存在的问题和应用的注意事项。最后对旋转应力场法进行了适当的改进,在原有方法的基础上考虑翼缘和加劲肋对腹板的约束作用以及翼缘对抗剪强度的贡献,使得计算结果更加接近试验结果。

英文摘要：

The shear buckling of webs is apt to occur when the thin plate aluminum girders are loaded under shear forces. But the post-buckling strength of the web plates is considerable since the frame composed of flanges and stiffeners can restrict the deformation of webs. Several theoretical design methods for the shear carrying capacity of aluminum girders are introduced, and the veracities of different methods are appraised by a comparison with foreign experimental data. The stress-field rotation method is found to be more exact, and some questions about its theory and application are discussed. Some modifications are performed for the stress-field rotation method. Constraints that flange and stiffened rib impose on web plate and contributions of flange to shear strength are both considered based on the existing method. Therefore the more accurate prediction of the shear carrying capacity of aluminum girders can be gained.