Abstract
It seems there are too many formulations about optimum depth of a plate girder and one may wonder which is most preferable for his case. The authors studied the problem by theoretical but rather classical way taking into account every factors having effect to the depth.The result shows the effect of specified allowable compressive stress formulation and the number of sectional changes in a girder must be considered and these factors lower the optimum depth of it. In case of rather short span, the practical limit on the compressive flange area has large effect, even that is not explicitly specified in a code.
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