钢拱壳穹顶结构在集中荷载作用下随厚度变化应力趋势预测

The Trend Forecast and Analysis of Bearing Capacity of Dome Structure

目的研究钢拱壳结构在向心集中力作用下的力学行为.方法引入弹性无矩球壳理论,以及对其实现假设条件的介绍,提出当结构无法满足无矩理论时的特例情况(在有集中力出现)时,分析半球壳结构,在同级荷载作用下,壳体厚度等因素变化对结构内部最大Mises应力的影响程度,并做出对其发展趋势的预测分析.结果随着壳体厚度的增加,球壳结构在同级荷载作用下,最大Mises应力随之减小;球壳结构曲率半径的变化,也会对结构承载力有相当的影响.结论钢拱壳结构的厚度及曲率半径的变化对结构承载力和随之而产生的位移都有较大的影响.通过曲线拟合后可以较为准确预测出结构承载力的发展趋势,为钢拱壳穹顶结构设计者提供设计参考依据.

In order to study the mechanical behavior of the structure of steel arch-shell under concentrated force, this paper introduces a flexible non-moment theory, and analyzes the hemispheric shell structure. And at the same level loads, the shell thickness and other factors change exert influence on the Mises stress of the internal structure and make prediction for its trends. The results show that at the same level loads, with the increase in the thickness of the shell, the largest Mises stress will decrease, and the change of the radius of curvature spherical shell structure also can have a considerable impact on the bearing capacity. Steel arch shell thickness and the changes of curvature radius have an influence on the structural bearing capacity and the structure displacement. After the adoption of curve fitting, we can predict more accurately of the develop- ment trend of the structure beating capacity, and thus can provide references for the arch-shell dome structure designers.