The distribution of stress in the knee of a riveter! steel rigid-frame specimcn having a curved inner Bange was investigated both experimentally and the oretically. A theory was developed which gives the stresses in the knee to the sam e order of accuracy as the ordinary beam the ory gives the stresses in the st rai ght legs of the frame. Reinforcing the outer corner of the knee and stiffening the web were shown to have little effect on the stress distribution in the frame. The maximum load that could be sustained by the specimen was determined.
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