矩形开口对吸收塔结构非线性屈曲特性影响分析
Nonlinear Buckling Characteristic Analysis of Desulfurizing Tower Structures Affected by Rectangular Openings

为了分析矩形开口参数对于吸收塔结构稳定性的影响规律，以一实际在建吸收塔结构为研究背景，基于参数化模型的正交试验，采用有限元软件ANSYS对比分析了不同开口参数下吸收塔柱壳结构的非线性屈曲特性。结果表明：开口角度对于结构的影响较其他参数大，开口角度小于90°时，结构的非线性屈曲极限荷载下降趋势较为明显，超过120°后，降幅趋于缓和，壁厚25 mm工况下，90°开口时结构的非线性屈曲极限荷载较0°开口时下降91%，120°开口时较0°开口时下降？？95.2%？？；结构的非线性屈曲极限荷载随着矩形开口高度的增加而逐渐减小，但开口位置对于结构稳定性的影响在整个过程中近似呈线性变化。
In order to analyze the influence rule of various rectangular opening parameters on the stability of desulfurizing tower structures, taking a desulfurizing tower structures under construction as the research background, based on the establishment of a parameterized model of thin？？walled cylindrical shell structures using finite element software ANSYS, the nonlinear buckling characteristics of structures with different opening parameters were comparatively analyzed. The results show that the opening angle significantly effects on the structures than any other parameters, the ultimate nonlinear buckling load has an obvious downtrend while the opening angle is less than 90°, and turning to decline gently while the opening angle is greater than 120°. While the wall thickness is 25 mm, the ultimate nonlinear buckling load in the case of 90° decreases by 91% comparing to the case of 0°, and the ultimate nonlinear buckling load in the case of 120° decreases by 95.2% comparing to the case of 0°. The ultimate nonlinear buckling load reduces as the opening height increases, however, the ultimate nonlinear buckling load reduces linearly with the increase of opening location