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利用非线性有限元法,分析了采用多种规格外部圆环加劲的圆柱形钢管的拟静力轴向破坏反应。加劲圆环将钢管沿竖向分为一系列的薄壁短柱结构。假定加劲肋的尺寸和形状由机械加工控制。研究了各种不同几何参数,如:钢管壁厚、环间距、环厚度和破坏时环的宽度,极限承载力和整体加劲钢管能量吸收的影响。将研究结果作为优化设计的基本原理。基于计算机模拟试验的分析,利用辐射函数,提出了关于平均承载力和能量消耗的后处理模型。运用单个对象和多个对象优化设计方程,得出不同反应特性的优化设计。根据渐进破坏屈曲得出的破坏模式依赖于加劲肋间距、加劲肋高度比、钢管壁厚以及加劲肋厚度比。优化结果显示,外加劲肋作为高效耗能构件是可靠的。
By using the nonlinear finite element method, the quasi-static axial failure response of a cylindrical steel tube stiffened by a variety of external rings is analyzed. Stiffening ring will be divided into vertical steel pipe a series of thin-walled short column structure. It is assumed that the size and shape of stiffeners are controlled by machining. Various geometrical parameters such as wall thickness, ring spacing, ring thickness and ring width, ultimate bearing capacity and energy absorption of the whole stiffened steel tube were studied. The research results as the basic principle of optimal design. Based on the analysis of computer simulation tests, a post-processing model about average bearing capacity and energy consumption was proposed by using the radiation function. Optimize the design equations with single object and multiple objects to get the optimal design of different reaction characteristics. The failure mode based on progressive failure buckling depends on the stiffener spacing, stiffener height ratio, pipe wall thickness, and stiffener thickness ratio. The optimization results show that external stiffeners are reliable as energy-efficient components.