The ordinary theory of flexure in beams, based on the "straight line" theory of strain and stress distribution, is a particular case of the general theory, when the depth
to span ratio is small. Design problems frequently arise, however, when this ratio is comparable to or greater than unity. To apply the "straight line" theory of flexure to such cases will lead to erroneous and often unsafe results. This paper sets out the main features of the design methods for beams in which the depth to span ratio is not small-henceforth to be designated "Girder Walls"-based in part on work already published 1 2 3, and in part on research work done by the writer.