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原文传递 Structural Evaluation of the John A. Roebling Suspension Bridge.

题名：	Structural Evaluation of the John A. Roebling Suspension Bridge.
作者：	choo, c. c. harik, i. e.
关键词：	suspension bridges,structural analysis/evaluation, bending, shear, finite element analysis, bridge decks, loads(forces), vehicle weight, trucks, buses, vehicle weight limits/
摘要：	The primary objective of the structural evaluation of the John A. Roebling Bridge is to determine the maximum allowable gross vehicle weight (GVW) that can be carried by the bridge deck structural elements such as the open steel grid deck, channels, standard sections, or built-up sections. To achieve this objective, four levels of analysis are carried out: 'Element Level', 'Sectional level I', Sectional Level II', and 'Global level' analysis. The four levels of analysis yield a load envelope that encapsulates the maximum and minimum allowable loads. The maximum allowable gross vehicle weight (GVW) for different truck and bus types are presented for different levels of structural elements sectional loss. The loss or reduction in element sectional properties is due to rust, cracks, etc. The 'Element Level Analysis' is the most critical and yielded the maximum allowable gross vehicle weights. The critical member in the bridge deck is the built-up 36 inch deep section. Its allowable bending strength controls the maximum 'Gross Vehicle Weight' (GVW) that can be permitted on the bridge. Results are presented for different levels of sectional losses (10%to 40%in 10%increments). In the event that replacement of the open grid deck will take place in the future, results are presented for different deck weights (10 psf to 50 psf in 10 psf increments). The current open grid deck weight is 20 psf. / Supplementary Notes: See also PB2005-102298. Sponsored by Kentucky Transportation Cabinet, Frankfort. / Availability Note: Product reproduced from digital image. 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 5285 Port Royal Road, Springfield, VA, 22161, USA.
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