00209600

Component

http://onlinepubs.trb.org...earchrpts/1952/14B-004.pdf

A SIMPLE-SPAN CONCRETE BRIDGE OVER ONEONTA CREEK ON THE COLUMBIA RIVER HIGHWAY WAS SELECTED FOR A FULL-SIZE INVESTIGATION TO DETERMINE THE LOAD DISTRIBUTION TO GIRDERS HAVING AN ADEQUATE DIAPHRAGM SYSTEM. THE WHEEL LOADS ARE DISTRIBUTED TO ADJACENT GIRDERS BY THE SLAB AS THOUGH IT WERE A SIMPLE BEAM. THESE LOADS DEFLECT THE GIRDERS AND A PART OF THE LOAD IS TRANSFERRED TO THE DIAPHRAGMS AT THEIR INTERSECTION WITH THE GIRDERS. SINCE THE DIAPHRAGM IS IN STATIC EQUILIBRIUM, THE LOAD TRANSFERENCE AT THE OUTSIDE GIRDERS MAY BE REGARDED AS REACTIONS AND AT THE INTERIOR GIRDERS AS LOADS, AND THE DEFLECTION CURVE OF THE DIAPHRAGM SET UP IN TERMS OF THE UNKNOWN LOAD-TRANSFER COEFFICIENT. THE LOAD TRANSFER DEPENDS ON THE RELATIVE STIFFNESS OF THE MEMBERS; WHETHER THE CONCRETE ACTS WITH THE STEEL IN RESISTING TENSION STRESSES (UNCRACKED SECTION) AND WHETHER THE CURBS AND SIDEWALKS ACT WITH THE EXTERIOR GIRDERS HAVE CONSIDERABLE EFFECT. THE TESTING WAS DONE BEFORE THE BRIDGE WAS OPENED TO GENERAL TRAFFIC, AND THE TEST RESULTS INDICATED THAT THE CONCRETE WAS EFFECTIVE IN TENSION AND THAT THE CURBS AND SIDEWALKS ACTED WITH THE EXTERIOR GIRDERS IN RESISTING STRESS.

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01381802

12p

1952

Highway Research Board Research Reports

Thirty-First Annual Meeting of the Highway Research Board

Digital/other

Appendices (1) ; Figures (10) ; Tables (3)

Bridge design; Bridges; Concrete bridges; Deflection; Diaphragms (Engineering); Girders; Highway bridges; Load tests; Load transfer; Structural design

Bridges and other structures; Highways

TRIS, TRB

Jun 5 1972 12:00AM

• DISTRIBUTION OF LOADS TO GIRDERS IN SLAB-AND-GIRDER BRIDGES: THEORETICAL ANALYSES AND THEIR RELATION TO FIELD TESTS
• EFFECT OF TRUCKS UPON A FEW BRIDGE FLOORS IN IOWA IN 1922 AND IN 1948
• LOAD DISTRIBUTION BETWEEN GIRDERS ON SAN LEANDRO CREEK BRIDGE
• REACTIONS OF A TWO-SPAN, SKEWED, RIGID-FRAME BRIDGE, WITH DISCUSSION
• TEST ON ROLLED-BEAM BRIDGE USING H20-S16 LOADING