Behavior of ungrouted and unbonded post-tensioned masonry beams and slabs

•An improved ungrouted and unbonded post-tensioned masonry system for beams and slabs is devoleped.•Tendon restraint blocks were designed to provide nonlinear displacement capacity.•Construction time and environmental impact are reduced due to the elimination of grouting. The paper shows and discuss...

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Bibliographic Details
Published in:Engineering structures 2017-06, Vol.141, p.703-714
Main Authors: Bonett, Ricardo L., Urrego, Hector, Carrillo, Julian
Format: Article
Language:English
Subjects:
Beams
Beams (structural)
Building codes
Building failures
Concrete
Concrete blocks
Concrete masonry
Deflection
Failure modes
Flexure
Masonry
Mathematical models
Post-tensioned
Post-tensioning
Restraint block
Slabs
Tendon
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Summary:•An improved ungrouted and unbonded post-tensioned masonry system for beams and slabs is devoleped.•Tendon restraint blocks were designed to provide nonlinear displacement capacity.•Construction time and environmental impact are reduced due to the elimination of grouting. The paper shows and discusses the results of an experimental program aimed at assessing the flexural behavior of ungrouted and unbonded post-tensioned masonry (UUPTM) elements such a beams or two-way slabs. In this structural system, the bed and head mortar joints are excluded and the concrete blocks are post-tensioned with unbonded tendons. A special tendon restraint block has been added to provide nonlinear displacement capacity of the specimens. The global performance is assessed in terms of cracking patterns, failure modes and load-deflection curves. Results from the experimental program indicate that the tendon restraints blocks improve the flexural behavior in terms of strength and nonlinear displacement capacity. Comparison between measured and predicted strength demonstrated that the equations of out-of-plane or in-plane flexural capacity of walls or solid masonry beams provided by building codes for masonry structures, may be used to estimate the maximum flexural capacity of the UUPTM beams having tendon restraint block.
ISSN:0141-0296
1873-7323
DOI:10.1016/j.engstruct.2017.03.035