This paper deals with the two dimensional optimum structural design of a simple sup-ported box girder by SCDD method and SUMT method and also the determinationof optimal dimensions of a propeller-shaft key by SCDD method.

• 本文用SCDD法及SUMT对箱形简支梁进行了二维结构优化计算,用SCDD 法计算了艉轴联接键尺寸。