Design of Highway Bridges: An LRFD Approach by Richard M. Barker, Jay A. Puckett

By Richard M. Barker, Jay A. Puckett

Layout of street Bridges: An LRFD technique КНИГИ ;ДИЗАЙН Название: layout of road Bridges: An LRFD ApproachАвтор: Richard M. Barker, Jay A. Puckett Издательство:Год: 2006-11-28Страниц: 1032 ISBN: 0471697583 Формат: PDF Язык: Английский Размер: sixty two MBThe updated consultant to making use of idea and requisites to real-world road bridge designDesign of street Bridges, moment version deals precise insurance of engineering fundamentals for the layout of brief- and medium-span bridges. in accordance with the yank organization of country street and Transportation officers (AASHTO) LRFD Bridge layout requirements, it truly is a great engineering source. This up-to-date variation features:* improved assurance of structural research, together with axle and lane a lot, in addition to new numerical analytic equipment and ways* Dozens of labored difficulties, basically in known U.S. devices, that permit ideas to be utilized to real-world difficulties and layout requirements* Revised AASHTO metal bridge layout instructions that mirror the simplified procedure for plate girder bridges* the most recent info on concrete bridges, together with new minimal reinforcement specifications, and unbonded tendon pressure at final and losses for prestressed concrete girders* info on key bridge forms, choice rules, and aesthetic concerns* difficulties and chosen references for extra research* And moreFrom gaining quickly familiarity with the AASHTO LRFD necessities to looking broader suggestions on road bridge design--this is the one-stop, prepared reference that places details at your fingertips.Скачать.com eighty five

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23). Sometime before the collapse of the suspended span, the inside hanger at the southeast corner came off the lower pin, which shifted all the weight on this corner to the outside hanger. With time, the outside hanger moved laterally outward on the upper pin. Eventually, a fatigue crack developed in the end of the upper pin, its shoulder fractured, the outside hanger slipped off, and the suspended span fell into the river. The NTSB concluded that the probable cause of the collapse of the Mianus River Bridge suspended span was the undetected lateral displacement of the hangers in the southeast corner suspension assembly by corrosioninduced forces due to deficiencies in the State of Connecticut’s bridge safety inspection and bridge maintenance program (NTSB, 1984).

Photo courtesy E. V. S. ) BOOKCOMP, Inc. 04 g, and vertical seismic forces were not considered. 25 g vertically. The seismic forces were larger than what the structures were designed for and placed an energy demand on the structures that could not be dissipated in the column–girder and column–footing connections. The connections failed, resulting in displacements that produced large secondary effects, which led to progressive collapse. Girders fell off their supports because the seat dimensions were smaller than the earthquake displacements.

One of these that remain to this day is the 137-ft (42-m) span Eden Park Bridge in Cincinnati, Ohio, built by Fritz von Emperger in 1895. This bridge is not a typical reinforced concrete arch but has a series of curved steel I-sections placed in the bottom of the arch and covered with concrete. Joseph Melan of Austria developed this design and, though it was used only for a few years, it played an important role in establishing the viability of reinforced concrete bridge construction ( Jackson, 1988).

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