论文部分内容阅读
针对目前没有立式锥底罐变壁厚锥底板设计公式和相关规范的现状,根据回转薄壁壳体的应力计算公式,基于无弯矩理论推导了锥底板在液压作用下的厚度设计公式。有限元数值计算结果表明,锥底罐在锥底与罐壁连接处(大角缝)应力集中程度比较严重。类比球罐设计用弧形母线回转薄壳代替原来的直线母线回转薄壳,并推导了其厚度计算公式。以3 200 m3立式锥底罐的设计为例,采用有限元软件ANSYS分别建立了两种锥底结构计算模型,并对计算结果进行对比分析。研究结果表明,弧形板锥底罐罐体应力值和变形量明显小于直板锥底罐,且大角缝处应力集中程度显著降低。此外,进行了不同长度弧形板锥底罐的数值计算,探寻了弧形板长度与应力和变形的关系。
In view of the current situation that there is no design formula and related norms of wall thickness cone floor with vertical conical bottom tank, the thickness design formula of conical floor under hydraulic pressure is deduced based on the theory of no bending moment according to the stress calculation formula of rotating thin wall shell. The numerical results of finite element analysis show that the stress concentration of the conical bottom tank at the junction between the cone bottom and the tank wall (large angle seam) is serious. Analog ball tank design arc bus bar rotating shell instead of the original linear generatrix shell, and derived its thickness formula. Taking the design of 3 200 m3 vertical conical bottom tank as an example, two kinds of calculation models of conical bottom structure were established respectively by the finite element software ANSYS, and the calculation results were compared and analyzed. The results show that the stress value and the deformation of the tank with cone bottom are obviously smaller than those with straight cone, and the stress concentration at the corner joints is significantly reduced. In addition, the numerical calculation of different lengths of cone bottom cans was carried out, and the relationship between the length of the arc plate and the stress and deformation was explored.