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解析法以其方便、简洁、程序化强的特点在伸缩臂腹板局部稳定性分析中被广泛应用。对于由不同厚度板组成的腹板,解析法通常取板厚平均值来计算其局部稳定性,计算结果偏于保守。为了寻求更为精确的等效板厚计算方法,本文提出一种对腹板上下槽板按不同权重系数进行加权平均的算法,采用有限元法验证算法的计算精度,并给出较为符合实际情况的权重值,从而为解析法计算等效板厚提供一种可行的途径。
Analytical method is widely used in the analysis of the local stability of telescopic webs due to its convenience, simplicity and strong program. For webs composed of different thickness plates, the analytical method usually takes the plate thickness average to calculate the local stability, and the calculation results are conservative. In order to find a more accurate equivalent thickness calculation method, this paper presents a weighted average of the upper and lower web plates according to different weighting coefficients. The finite element method is used to verify the calculation accuracy of the algorithm. Weight value, so as to provide a feasible way for the analytical method to calculate the equivalent thickness.