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本文用限条法导出了分析二次抛物形扁壳的计算模式。所采用的曲条单元可用于分析在某一方向曲率较大的二次抛物壳体。经过蜕化,它还可计算双曲扁壳、柱壳及析板等结构。用这一摸式在微型机上编制了FORTRAN静力和动力程序,并对各种正、负及零高斯曲率扁壳进行了计算。对双曲马鞍型壳还进行了静力和动力试验,将理论计算值与实验结果进行比较,两者符合较好。将有限条法的计算情况与有限元法进行比较,前者具有计算精度高、省时、省内存等优点,并使许多问题可在微型机上解决。
In this paper, the calculation method for the analysis of quadratic parabolic shallow shells is derived using the limit bar method. The curved element used can be used to analyze the secondary parabolic shell with a large curvature in a certain direction. After degeneration, it can also calculate the structure of the hyperbolic flat shell, column shell and plate. The FORTRAN static and dynamic programs were programmed on the microcomputer in this mode, and various positive, negative and zero Gaussian curvature flat shells were calculated. The static and dynamic tests were also performed on the double-curvature saddle shells. The theoretical calculations were compared with the experimental results and the two were in good agreement. Comparing the calculation method of the finite strip method with the finite element method, the former has the advantages of high calculation accuracy, time saving, and memory saving, and enables many problems to be solved on a microcomputer.