Seismic Behavior of Bridge Column Non-contact Lap Splices PDF Download
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Author: Yongqian Lin
Publisher:
ISBN:
Category : Bridges, Concrete
Languages : en
Pages : 342
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Book Description
Author: Yongqian Lin
Publisher:
ISBN:
Category : Bridges, Concrete
Languages : en
Pages : 342
Get Book Here
Book Description
Author: Yongqian Lin
Publisher:
ISBN:
Category :
Languages : en
Pages : 642
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Book Description
Inadequate flexural strength and ductility, or shear strength, of concrete bridge columns have resulted in collapse or severe damage of a number of California bridges in recent moderate earth-quakes. In general, these bridges were designed prior to the new seismic design methods which were implemented in the mid-seventies. Bridges constructed in accordance with the new design methods have performed well in recent earthquakes. However, the large number of older bridges that are still in service, particularly freeway overpasses designed and constructed in the 1950's to 1970's, are now recognized to have substandard design details and to constitute a cause for major concern. The principal objective of this study is to provide basic knowledge on the performance of circular columns with noncontact lap splices at their maximum moment sections. As part of that work the validity of existing equations, (Darwin et al, 1995), for calculating the maximum bar stress (or bond strength of lap splice) at failure along the splice length is examined. Then a simple model is used to provide reasonable predictions of the response to seismic loadings of bridge columns with inadequate length lap splices at the column to foundation connection. This study involved both field and laboratory investigations. The field work involved the reversed cyclic lateral load testing to failure of four as--built large diameter circular columns which formed parts of existing bridge piers. However, due to the wide irregularities in the details of the field columns, it was not possible to determine the relative importance of the various parameters. Therefore, a laboratory investigation to examine physically what effects concrete cover, bar spacing and bar lap separation had on the behavior of columns with splices at the maximum moment region at their bases was undertaken in the Newmark Civil Engineering Laboratory.
Author: Carol Louise Smith
Publisher:
ISBN:
Category : Reinforced concrete construction
Languages : en
Pages : 160
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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 45
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Book Description
Author: Alfred Steinle
Publisher: John Wiley & Sons
ISBN: 3433032254
Category : Technology & Engineering
Languages : en
Pages : 378
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Book Description
Building with precast concrete elements is one of the most innovative forms of construction. This book serves as an introduction to this topic, including examples, and thus supplies all the information necessary for conceptual and detailed design.
Author: Michelle Teng Chang
Publisher:
ISBN:
Category :
Languages : en
Pages : 248
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Book Description
Drilled shaft foundations are often used to support reinforced concrete bridge columns founded in soft soils or in locations where a small footprint is desired. Increasingly, the shaft is being built with a diameter larger than that of the column, to allow tolerance in the column placement and to facilitate plastic hinge formation in the column rather than in the shaft. The column-shaft connection, which involves a noncontact splice between the column and shaft bars, is a key component in this structural system. However, there is limited research on the behavior of these connections under seismic loads. In order to understand the force-transfer mechanism of column-shaft connections under seismic loading, one quasi-static cyclic experimental test was conducted on a column-shaft subassembly. Measured results were compared with those from three previous experiments performed at the University of Washington. The study found that the amount of shaft transverse reinforcement in the connection region was critical in determining the failure mode of the connection. In specimens with relatively low amounts of transverse reinforcement, including the specimen tested during this study and a previous specimen tested at the University of Washington, the connection failed through a shaft prying failure mode; the specimens developed large vertical cracks between the confined column core and the annular shaft transition region, and the shaft transverse reinforcement eventually fractured at large drift ratios. Therefore, three methodologies for detailing the shaft transverse reinforcement were evaluated, and a new analysis procedure using a strut-and-tie model was proposed. It is consistent with the measured and observed performance of the tested connections, and is applicable to shafts supporting either precast or cast-in-place columns. The new procedure allows engineers to more accurately predict the behavior of a column-shaft connection and prevent an undesirable below-ground failure in the shaft transition region. Lastly, a set of design equations based on the strut-and-tie findings and existing design models is proposed for use in practice.
Author: M. J. N Priestley
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 350
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Book Description
Author: Zunling Sun
Publisher:
ISBN:
Category :
Languages : en
Pages : 576
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Book Description
Author:
Publisher:
ISBN:
Category : Columns, Concrete
Languages : en
Pages : 367
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Book Description
Author: Balasubramaniam Sivakumar
Publisher:
ISBN:
Category : Columns, Concrete
Languages : en
Pages : 232
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Book Description
