00209602

Component

http://onlinepubs.trb.org...earchrpts/1952/14B-006.pdf

THIS INVESTIGATION SEEKS TO ADD CREDENCE TO RATHBUN'S THEORY AND TO POINT OUT SUCH LIMITATIONS AS MAY EXIST, BY MEANS OF EXPERIMENTAL CORRELATION OF REACTIVE FORCES. THE FOLLOWING FACTS WERE BROUGHT OUT: (1) THE VERTICAL REACTIONS Y AND THE HORIZONTAL THRUSTS X ARE ESSENTIALLY INDEPENDENT OF SKEW ANGLE FOR CENTERLINE LOADING AND VARY WITH SKEW ONLY SLIGHTLY FOR OFF-CENTER LOADING; (2) FOR PRACTICAL DESIGN PURPOSES, X AND Y ARE THE SAME AS FOR A SIMILAR RIGHT FRAME OF THE SAME SQUARE SPAN. THE MODEL STUDY COMPLETELY SUBSTANTIATES THE THEORY FOR THESE REACTIONS; (3) CROSS- SHEAR Z IS EQUAL TO THE TANGENT OF THE SKEW ANGLE MULTIPLIED BY THE CORRESPONDING THRUST X; MODEL RESULTS ARE NOT REPORTED FOR THIS REACTION BECAUSE OF MODEL LIMITATIONS, BUT AMPLE EVIDENCE EXISTS TO SUBSTANTIATE THIS FACT; (4) HORIZONTAL MOMENT IS NEGLIGIBLE AND MAY BE NEGLECTED IN DESIGN; AND (5) TORSIONAL MOMENTS SHOW SERIOUS DISCREPANCY WITH THEORY, WITH THEORETICAL VALUES APPARENTLY ON THE UNSAFE SIDE. IT IS BELIEVED THAT THE SAINT VENANT TORSIONAL FACTOR IS NOT APPLICABLE TO SKEWED PLATES HAVING THE PROPORTIONS OF BRIDGE SLABS, AND FUNDAMENTAL INVESTIGATION OF THIS FACTOR IS CONSIDERED TO BE DESIRABLE. /AUTHOR/

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01381802

Plower, Jason; Gee, Herbert; Erickson, E L; Fisher, G P; Boyer, W C

11p

1952

Highway Research Board Research Reports

Thirty-First Annual Meeting of the Highway Research Board

Digital/other

Figures (9) ; References (14) ; Tables (4)

Bridge design; Bridges; Loads; Mathematical models; Skew bridges; Skewed structures; Structural design

Horizontal loads; Loading; Models; Vertical loads

Bridges and other structures; Highways

TRIS, TRB

May 22 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
• LOAD DISTRIBUTION ON HIGHWAY BRIDGES HAVING ADEQUATE TRANSVERSE DIAPHRAGMS
• TEST ON ROLLED-BEAM BRIDGE USING H20-S16 LOADING