MODEL TESTS OF MODES OF FAILURE OF JOINT CI3N OF EYEBAR CHAIN, POINT PLEASANT BRIDGE INVESTIGATION
Two scale models of a portion of the eyebar chain at the Point Pleasant Bridge were assembled and load tested to study two hypothesized modes of failure of one joint. In the first test, a brittle fracture failure (induced by a notch) occurred in the eye of one of the eyebars at the joint resulting in total separation of the joint. Damage and deformation of the members at the joint resulting from this model failure were remarkably similar to those of corresponding members of the prototype collapse. In the second model an attempt was made to cause one of the eyebars at the same joint to walk off the joint pin by removing the retainer nut, canting the pin and imposing a cyclic loading regime patterned after the prototype dead load and live load variations. No movement occurred under these conditions. Only when the dead load was reduced to a nominal level was it possible to get the walking movement of the eyebar and even then the movement stopped after a limited displacement. The report concludes that the model tests indicate that the separation which occurred in the prototype bridge was initiated by brittle fracture in the eye of the eyebar at the subject joint.
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Washington, DC United States 20590
- Scheffey, C F
- Cayes, L R
- Publication Date: 1974-1
- Pagination: 36 p.
- TRT Terms: Bars (Building materials); Bridges; Deformation; Failure; Fracture mechanics; Highway bridges; Joints (Engineering); Load tests
- Uncontrolled Terms: Eyebars; Model tests
- Old TRIS Terms: Joint
- Subject Areas: Bridges and other structures; Highways;
- Accession Number: 00142883
- Record Type: Publication
- Source Agency: Federal Highway Administration
- ISBN: 2622 372
- Report/Paper Numbers: FHWA-RD-74- 19 Final Rpt.
- Files: TRIS, USDOT
- Created Date: Dec 15 1988 12:00AM