Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

The paper describes the design and construction history of a 10-story (with provision for two more stories) combination parking structure and office building cost effectively built over soft clay in Chicago, Illinois. The site profile consisting of medium dense to dense sand and sandy silt underlain by soft compressible clay to a very thin, sometimes non-existent, very stiff to hard clay layer underlain by water bearing very dense sandy silt to limestone bedrock made foundation design within the owner's budget difficult. The development of a unique combination of strip footings in the shallow, medium dense to dense sand layer combined with straight shaft piers under the columns and extended to the very dense sandy silt layer is described. The instrumentation program to determine the load distribution between strip footing and straight shaft pier is presented as well as the instrumentation monitoring during construction and for several years after construction. Observed settlement and load distribution is compared favorably to predicted settlement and load distribution.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Use of Straight Shaft Piers as Settlement Reducers in Combined Footing Design over Chicago Soft Clay

New York, New York

The paper describes the design and construction history of a 10-story (with provision for two more stories) combination parking structure and office building cost effectively built over soft clay in Chicago, Illinois. The site profile consisting of medium dense to dense sand and sandy silt underlain by soft compressible clay to a very thin, sometimes non-existent, very stiff to hard clay layer underlain by water bearing very dense sandy silt to limestone bedrock made foundation design within the owner's budget difficult. The development of a unique combination of strip footings in the shallow, medium dense to dense sand layer combined with straight shaft piers under the columns and extended to the very dense sandy silt layer is described. The instrumentation program to determine the load distribution between strip footing and straight shaft pier is presented as well as the instrumentation monitoring during construction and for several years after construction. Observed settlement and load distribution is compared favorably to predicted settlement and load distribution.