Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Civil Engineering


In reviewing the papers in the literature concerning delta girder bridges, 1,2,3, it is frequently found that investigations were not carried far enough to be useful for actual design in engineering offices. This is attributed mainly to one or both of the following reasons: 1. The successful outcome of test results were not based on a sound theoretical analysis of the behavior of the delta girder. 2. The investigations did not give detailed theoretical and experimental studies to obtain the optimum size and geometry of the delta girder. The delta girder consists of the same basic cross section as the conventional welded plate girder, but, in addition, provides a pair of continuous diagonal plates that span and close off the reentrant corners between the web and the compression flange. Plate girders are commonly used in highway and railroad bridges and in building frames where special loading conditions prevail or long spans are required. The existing codes and specifications dictate to a large extent the sizes and dimensions required in the design of a plate girder. The conventional plate girder designed in accordance with the specifications of the American Association of State Highway Officials (AASHO) does not provide satisfactory lateral stiffness during construction. Therefore, stiffeners are introduced in the design of plate girders.

Library of Congress Subject Headings

Buckling (Mechanics)




South Dakota State University