Refinement of Strut-and-Tie Model for Reinforced Concrete Deep Beams
Deep beams are commonly used in tall buildings, offshore structures, and foundations. According to many codes and standards, strut-and-tie model (STM) is recommended as a rational approach for deep beam analyses. This research focuses on the STM recom- mended by ACI 318-11 and AASHTO LRFD and use...
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Main Authors: | , , |
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Format: | Article |
Language: | English |
Published: |
2015
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Subjects: | |
Online Access: | http://eprints.intimal.edu.my/29/1/Refinement%20of%20Strut-and-Tie%20Model%20for.PDF http://eprints.intimal.edu.my/29/ http://dx.doi.org/10.1371/journal.pone.0130734 |
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Institution: | INTI International University |
Language: | English |
Summary: | Deep beams are commonly used in tall buildings, offshore structures, and foundations.
According to many codes and standards, strut-and-tie model (STM) is recommended as a
rational approach for deep beam analyses. This research focuses on the STM recom-
mended by ACI 318-11 and AASHTO LRFD and uses experimental results to modify the
strut effectiveness factor in STM for reinforced concrete (RC) deep beams. This study aims
to refine STM through the strut effectiveness factor and increase result accuracy. Six RC
deep beams with different shear span to effective-depth ratios (a/d) of 0.75, 1.00, 1.25,
1.50, 1.75, and 2.00 were experimentally tested under a four-point bending set-up. The ulti-
mate shear strength of deep beams obtained from non-linear finite element modeling and
STM recommended by ACI 318-11 as well as AASHTO LRFD (2012) were compared with
the experimental results. An empirical equation was proposed to modify the principal tensile
strain value in the bottle-shaped strut of deep beams. The equation of the strut effectiveness
factor from AASHTTO LRFD was then modified through the aforementioned empirical
equation. An investigation on the failure mode and crack propagation in RC deep beams
subjected to load was also conducted. |
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