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一、绪言管板结构通常由上下两块圆板和大群管子连接而成,广泛用作核反应堆支承结构,亦常用于热交换器中。用作核反应堆支承结构时,它所承受的介质压差可达到四、五百吨,而运行中为了保持工艺孔道的直线性,管板挠度不得超过数毫米。故在设计时必须对此种复杂结构挠度进行比较精确的分析。按经典弹性力学方法得到的管板结构基本微分方程组,往往不易求解,过去常用级数解、有限差分解等作近似分析,或采用实验分析方法,但对于双向加肋,具有不同管径,管群为正方栅格分布的管板,由于结构复杂,级数解和差分解都难以应用, 本文利用弹性地基支承耦合圆板分析方法,对管群为正方栅格布置、管径不同、且有双向加肋的管板,提供一种近似分析方法供设计使用。通过一个结构实例进行分析,用本文推荐方法所得挠度值,与通用有限元程序及模型试验所得挠度作了比较,本文计算结果更接近于测量值。
I. INTRODUCTION The tube plate structure is usually made up of two round plates and a large number of tubes connected together. It is widely used as a support structure for nuclear reactors and is also commonly used in heat exchangers. When used as a nuclear reactor support structure, it can withstand medium pressure difference up to four, 500 tons, and operation in order to maintain the straightness of the process hole, the tube plate deflection must not exceed several millimeters. Therefore, in the design of this complex structure must be more accurate analysis of deflection. According to the classical elastic mechanics method, the basic differential equations of the tube plate structure are not easy to solve. In the past, the series solution and the finite difference solution were used for approximate analysis or experimental analysis. However, for two-way ribbing, Due to the complex structure, the series solution and the differential solution are both difficult to be applied to the tubesheet with tube grids distributed in a square grid. In this paper, a flexible grid-supported coupled circular plate analysis method is used to arrange the tube clusters in a square grid with different diameters Two-way ribbed tube sheets provide an approximate method of analysis for design use. Through a structural example analysis, the deflection values obtained by the proposed method are compared with those obtained by the general finite element program and the model test. The calculated results are closer to the measured values.