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UBC Theses and Dissertations
Shear design of pile caps and other members without transverse reinforcement Zhou, Zongyu
Abstract
This thesis deals with the shear design of structural concrete members without trans verse reinforcement. The three major parts of this study are the transverse splitting of compression struts confined by plain concrete, the development of a rational design procedure for deep pile caps, as well as a general study of the shear transfer mechanisms of concrete beams. Three-dimensional compression struts that are unreinforced and confined by plain concrete, as occur in deep pile caps, were studied both analytically and experimentally. Based on the study results, bearing stress limits are proposed to prevent compression struts from transverse splitting. The maximum bearing stress depends on the amount of confinement, as well as the aspect ratio (height to width) of the compression strut. The proposed bearing stress limit was incorporated into a strut-and-tie model to develop a rational design procedure for deep pile caps. Two methods are proposed. The first method is a direct extension of two-dimensional strut-and-tie models used for deep beams. The second method is presented in a more traditional form in which “flexural design” and “shear design” are separated. The shear design is accomplished by limiting the bearing stress at the columns and the piles. The first method is more appropriate for analysis, while the second method is more appropriate for design. The rationality and accuracy of the proposed methods are demonstrated by the comparison with previous test results. In the final part of this study, the influence of bond between concrete and longitudinal reinforcement upon the load transfer mechanism of both deep members and slender members without stirrups are investigated. An interpretation of an important shear failure mechanism is presented.
Item Metadata
Title |
Shear design of pile caps and other members without transverse reinforcement
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
This thesis deals with the shear design of structural concrete members without trans
verse reinforcement. The three major parts of this study are the transverse splitting
of compression struts confined by plain concrete, the development of a rational design
procedure for deep pile caps, as well as a general study of the shear transfer mechanisms
of concrete beams.
Three-dimensional compression struts that are unreinforced and confined by plain
concrete, as occur in deep pile caps, were studied both analytically and experimentally.
Based on the study results, bearing stress limits are proposed to prevent compression
struts from transverse splitting. The maximum bearing stress depends on the amount of
confinement, as well as the aspect ratio (height to width) of the compression strut.
The proposed bearing stress limit was incorporated into a strut-and-tie model to
develop a rational design procedure for deep pile caps. Two methods are proposed. The
first method is a direct extension of two-dimensional strut-and-tie models used for deep
beams. The second method is presented in a more traditional form in which “flexural
design” and “shear design” are separated. The shear design is accomplished by limiting
the bearing stress at the columns and the piles. The first method is more appropriate for
analysis, while the second method is more appropriate for design. The rationality and
accuracy of the proposed methods are demonstrated by the comparison with previous
test results.
In the final part of this study, the influence of bond between concrete and longitudinal
reinforcement upon the load transfer mechanism of both deep members and slender
members without stirrups are investigated. An interpretation of an important shear failure mechanism is presented.
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Extent |
5985302 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-04-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050429
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.