00390852

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http://onlinepubs.trb.org...trr/1984/950/950v1-015.pdf

https://scholar.google.co...reen&publication_year=1984

The Ontario Highway Bridge Design Code (OHBDC) contains provisions for dynamic load and vibration that differ substantially from those of other codes. In these provisions it is considered that the dynamic effects of vehicles crossing highway bridges can still be described in terms of an equivalent static effect that is a fraction of the design vehicle load, but the magnitude of this effect is described in terms of the natural frequency of the structure rather than the span length. Few codes are based on a limit-state design philosophy for both design and evaluation. Accordingly, new provisions were required for OHBDC that adequately represent the random effects of the dynamic component of load as typical design and evaluation vehicles traverse a span. A review of existing code provisions for impact, a discussion of vehicle-bridge interaction, and dynamic tests of bridges carried out in the Province of Ontario during the past 25 years are provided. The results of the tests are presented and discussed in the context of a design code for highway bridges. Some existing provisions were found unconservative for structures having a first flexural frequency between 2.0 and 5.0 Hz. Calibration of the load factors for dynamic load allowance for a reliability-based limit-state design codde is described. In summary, the dynamic response of modern bridges to modern vehicles is reviewed and how this response can be catered to in a design code is described.

This paper appeared in Transportation Research Record Number 950, Volume 1, Second Bridge Engineering Conference conducted by the Transportation Research Board and the Federal Highway Administration, September 24-26, 1984. Publication of this paper sponsored by Committee on Dynamics and Field Testing of Bridges. 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

01419841

pp 94-103

1984

Transportation Research Record

Bridge Engineering Conference, 2nd, 1984, Washington, DC, USA

03090036593

Print

Figures (18) ; References (31) ; Tables (1)

Bridge design; Bridges; Building codes; Dynamic loads; Dynamic tests; Structural design; Ultimate load design; Vehicles; Vibration

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

TRIS, TRB

Dec 30 1984 12:00AM