Photoelastic Model of Bridge Cross-Frame Junction

by Alex S. Redner, (A.M.ASCE), Vice Pres.; Research and Development Photoelastic Div., Vishay Intertechnology, Inc., Malvern, Pa.,
Leonard Pompa, Technical Contract Mgr.; Lukens Steel Co., Coatesville, Pa.,

Serial Information: Journal of the Engineering Mechanics Division, 1976, Vol. 102, Issue 4, Pg. 659-670

Document Type: Journal Paper


During the construction of the Bryte Bend Bridge on Interstate 880 near Sacramento, Calif., a crack developed in the main flange. A photoelastic model was constructed and analyzed to determine experimentally the prevailing stresses. The stress at the weld connecting the cross-frame strut to the main flange, where the crack originated, was measured. The results indicate that the welding of the strut produced a change in geometry, creating a threefold increase in the stress, when compared to the unwelded design.

Subject Headings: Structural models | Bridges | Frames | Infrastructure construction | Cracking | Flanges | Stress analysis | Struts | California | United States

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