For a naval ship with a long strength superstructure and a lot of hatch, it is difficult to evaluate the hull girder's strength by general beam theory because of the complexity of the hull structure.
当舰船设有长度较长但开口较多的上层建筑时，其船体结构的复杂性使船体总强度很难用常规的梁理论方法确定。
When the beam theory was used to calculate ship hull vibration, greater discrepancies were found between theoretical calculations and actual measurements especially at higher-modes.
当用梁理论计算船体振动的高谐调特性时，理论计算值与实际试验量测值有较大偏差。这样，梁理论不能作为计算高协调振动的一个实际可用的方法。
The method for torsional analysis of ship hull as a stepped thin-walled beam using the restrained torsion theory has been applied widely in the field of naval architecture.
将船体作为阶梯薄壁梁，用薄壁梁的约束扭转理论进行扭转强度分析的方法，是目前国内外造船界普遍使用的方法。
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