00378772

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http://onlinepubs.trb.org...s/trr/1983/903/903-001.pdf

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In July 1979, field tests were conducted on the Fremont Bridge on the Willamette River in Oregon to obtain strain and temperature measurements that would provide information on in situ and service load stress conditions. The behavior of the bridge was more dependent on temperature than on traffic. On a hot day when the temperature reached 100 deg F, the temperature differential between the exposed top and shaded bottom flange plates was 50 deg F. The maximum daily stress range in the tie girders due to the temperature differential was about 10 ksi. Where local bending occurred in the web plates, the maximum daily stress range was about 20 ksi. Comparison of strain readings on two days of comparable temperature, with light and heavy traffic, indicated that the stress range due to traffic was about 1-2 ksi. Dynamic recordings of strain were made at 12 selected category E details during typical traffic conditions. The passage of heavy vehicles typically caused stress ranges up to 1000 psi. The largest measured stress range of about 3000 psi was associated with the passage of a heavy mobile crane. The frequency of these stress ranges was estimated to be about 50 percent of the average daily truck traffic of 5400 vehicles. The bridge was also subjected to a controlled loading of four heavy vehicles weighing a total of 177 100 lb. The maximum stress range occurring on an instrumented cross section near the junction of the arch rib and tie girder was 750 psi. The maximum stress range at any other instrumented location was 2150 psi. (Author)

Publication of this paper sponsored by Committee Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved on Dynamics and Field Testing of Bridges.

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pp 1-8

1983

Transportation Research Record

62nd Annual Meeting of the Transportation Research Board

0309035171

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Figures (22) ; References (2)

Field tests; Flanges; Highway bridges; Load tests; Plate metal; Strain (Mechanics); Stresses; Temperature; Traffic loads; Webbing

Fremont Bridge (Portland, Oregon)

Bridges and other structures; Design; Freight Transportation; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB

Nov 30 1983 12:00AM

• ABNORMAL ROTATIONS OF SKEWED AND CURVED BRIDGES
• BEHAVIOR OF ABUTMENT PILES IN AN INTEGRAL ABUTMENT IN RESPONSE TO BRIDGE MOVEMENTS
• CALTRANS PRESTRESSED CONCRETE PIPE CULVERT RESEARCH: DESIGN SUMMARY AND IMPLEMENTATION
• COMPUTER MODELING OF THE CROSS CANYON CULVERT
• Effect of Heavy Loads on Buried Corrugated Polyethylene Pipe
• EFFECTIVE COEFFICIENT OF FRICTION OF STEEL BRIDGE BEARINGS
• FULL-DEPTH MODULAR PRECAST, PRESTRESSED BRIDGE DECKS
• LOAD FACTOR DESIGN APPLIED TO TRUSS MEMBERS IN DESIGN OF GREATER NEW ORLEANS BRIDGE NO. 2
• OBSERVATIONS OF HIGHWAY BRIDGE MOVEMENTS AND THEIR EFFECTS ON JOINTS AND BEARINGS
• PERFORMANCE OF FULL-SPAN PANEL-FORM BRIDGES UNDER REPETITIVE LOADING
• Seismic Design of Curved Box Girders
• SKEWED BRIDGES WITH INTEGRAL ABUTMENTS
• STUDY OF CRACKING OF COMPOSITE DECK BRIDGE ON I-75 OVER PEACE RIVER
• TEST TO FAILURE OF THE HANNACROIX CREEK BRIDGE
• TESTING AND DESIGN OF LONGITUDINAL REINFORCEMENT FOR CANTILEVERED BRIDGE PIERS