United States Department of Transportation
i
A static analysis method for barge-impact design of bridges with consideration of dynamic amplification : final report, November 2009.
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2009-11-01
[PDF-2.50 MB]
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Edition:Final report.
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Abstract:Current practice with regard to designing bridge structures to resist impact loads associated with barge collisions relies upon the
use of the American Association of State Highway and Transportation Officials (AASHTO) bridge design specifications. The AASHTO
barge impact design provisions, which were developed from pendulum impact-hammer testing of reduced-scale barge models, employ a
static analysis approach. However, recent studies have revealed that significant dynamic amplifications of structural demands (pier design
forces) are produced as the result of mass-related inertial forces associated with the bridge superstructure. These same studies have also
demonstrated that currently employed static analysis procedures fail to capture or account for such amplification effects.
In the present study, an equivalent static analysis procedure is developed for use in barge impact design and assessment of bridge
structures. In contrast to the AASHTO static analysis procedure, the new method proposed here, called the static bracketed impact analysis
(SBIA) method, employs static loading conditions and static structural analyses, but produces bridge design forces that conservatively
approximate dynamic amplification effects associated with superstructure mass. Alternatively stated, the SBIA method produces bridge
design forces that are equivalent to—or greater than—those that would be predicted using more refined dynamic time-domain methods
such as the previously developed coupled vessel impact analysis (CVIA) method. Due to its simplicity, SBIA is particularly appropriate for
situations involving preliminary design of bridges or the design of relatively regular bridge structures for which time-domain dynamic
analysis is not warranted.
In this report, a detailed discussion of mass-related dynamic amplifications in bridges subjected to barge impact loading is
presented. Based on insights gained through characterization of dynamic amplification modes, the static bracketed impact analysis (SBIA)
method is developed and described in detail. A parametric study is then conducted using the SBIA method to demonstrate that
conservative, dynamically amplified bridge design forces are produced.
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