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Contribution of steel casing to single shaft foundation structural resistance

Author: Michel BruneauHadi KenarangiThomas P MurphyNational Academies of Sciences, Engineering, and Medicine (U.S.). Transportation Research Board,National Cooperative Highway Research Program,All authors
Publisher: Washington, DC : Transportation Research Board, 2018. ©2018
Series: NCHRP research report, 872.
Edition/Format:   Print book : EnglishView all editions and formats
Summary:
NCHRP Report 872 provides proposed revisions to the AASHTO LRFD Bridge Design Specifications and AASHTO Guide Specifications for LRFD Seismic Bridge Design for a single shaft foundation supporting a column to account for the contribution of steel casing and composite action on structural resistance with detailed examples of the application of the proposed revisions. The proposed revisions are based on comprehensive
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Material Type: Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Michel Bruneau; Hadi Kenarangi; Thomas P Murphy; National Academies of Sciences, Engineering, and Medicine (U.S.). Transportation Research Board,; National Cooperative Highway Research Program,; American Association of State Highway and Transportation Officials,; United States. Federal Highway Administration,
ISBN: 9780309446822 0309446821
OCLC Number: 1032828607
Notes: At head of title: National Cooperative Highway Research Program.
Description: 167 pages : illustrations ; 28 cm
Contents: Background --
Research approach --
Findings and applications --
Conclusions
Series Title: NCHRP research report, 872.
Responsibility: Michel Bruneau, Hadi Kenarangi, Thomas P. Murphy.
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Abstract:

NCHRP Report 872 provides proposed revisions to the AASHTO LRFD Bridge Design Specifications and AASHTO Guide Specifications for LRFD Seismic Bridge Design for a single shaft foundation supporting a column to account for the contribution of steel casing and composite action on structural resistance with detailed examples of the application of the proposed revisions. The proposed revisions are based on comprehensive analytical and testing programs for investigating the effects of steel casing. The material in this report will be of immediate interest to highway structural engineers. --See publisher's website (http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=3406).

Bridges are often constructed with a single enlarged shaft foundation supporting a column. In many cases the shaft foundation is constructed with a permanent steel casing. The steel casing is typically ignored in design when calculating the structural resistance of the shaft; only the reinforced concrete section of the shaft is considered for structural resistance. Bridge designers would like to account for the added structural resistance of the steel casing but there is limited research data as to when the steel casing and concrete inner core act as a composite section. The combination of the steel casing and the interior reinforced concrete is typically called Concrete Filled Steel Tube (CFST) or Reinforced Concrete Filled Steel Tube (RCFST). Determining the properties of the composite RCFST section and at what point along the shaft the section can be considered a composite section would be beneficial to design and could significantly reduce construction cost. Under NCHRP Project 12-93, the University at Buffalo was asked to propose revisions to the AASHTO LRFD Bridge Design Specifications and AASHTO Guide Specifications for LRFD Seismic Bridge Design for a single shaft foundation supporting a column to account for the contribution of steel casing including reinforced concrete confinement and composite action on structural resistance. The research considered axial, flexural, and shear effects under axial and lateral loading for strength and extreme event limit states for a steel cased reinforced concrete single enlarged shaft. --See publisher's website (http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=3406).

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