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原文传递 Static Analysis Method for Barge-Impact Design of Bridges with Consideration of Dynamic Amplification.

题名：	Static Analysis Method for Barge-Impact Design of Bridges with Consideration of Dynamic Amplification.
作者：	G. R. Consolazio;
关键词：	bridge design,impact strength,impact loads,barges;dynamic analysis, collisions, bridge piers, structural design, static analysis, finite element analysis;static bracketed impact analysis(sbia)
摘要：	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 a 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 dynamic analysis is not warranted. In the 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 the conservative, dynamically amplified bridge design forces are produced. / Title Note: Final rept. / Supplementary Notes: Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Management Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A07 / NTIS In-house Control Codes: dotour;12091,1101
报告类型：	科技报告