00485579

Component

http://onlinepubs.trb.org...trr/1988/1180/1180-012.pdf

https://scholar.google.co...Leon&publication_year=1988

An instrumentation and load-testing analysis of the 536-ft, two-span, open spandrel arch-rib Hennepin Avenue Bridge over the Mississippi River in Minneapolis, Minnesota, was conducted to measure the transverse load distribution among the six arches of the bridge and to determine whether the buckled webs of the arch ribs carry any load. When the structure was rated for Hennepin County in 1983, the load distribution and the ability of the buckled web plates to carry axial stress were questioned. Thus, an instrumentation analysis under static load was performed. The bridge was instrumented with 18 strain gauges and was loaded with three 27.5-ton tandem dump trucks positioned in nine different loading arrangements. Strain readings were averaged for each loading to determine the magnitude of load carried by each arch rib and then compared with a computer-modeled (linear) transverse distribution. It was found that the arch ribs carried not only axial stress, but also stress due to bending moments. It was concluded from the study that the floor beams and diaphragms do not transfer loads from one side of the bridge to the other. The results of the web testing demonstrated that a nominal axial load was being carried by the web, and that, although buckled, it was working effectively through a tension-field mechanism similar to that of a simple truss.

This paper appears in Transportation Research Record No. 1180, Bridge Design and Testing. 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

01416537

p. 90-93

1988

Transportation Research Record

030904720X

Figures (3) ; References (1)

Arch bridges; Arches; Axial loads; Bending moments; Load transfer; Loads; Monitoring; Static loads; Strain gages; Webbing

Axial stress; Transverse loading

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

TRIS, TRB, ATRI

Jul 31 1989 12:00AM

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