Modified Composite Application to Improve Strength and Ductility ofStructural Components

Bibliographic Details
Main Author:	Shrestha, Umesh Shahu
Language:	English
Published:	University of Toledo / OhioLINK 2014
Subjects:	Civil Engineering
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418403567

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-toledo14184035672021-08-03T06:28:36Z Modified Composite Application to Improve Strength and Ductility ofStructural Components Shrestha, Umesh Shahu Civil Engineering The present numerical study investigates the application of carbon fiber reinforced polymer (CFRP) composite sheets to improve strength and to explore the potential ductility enhancement of concrete and masonry structural components. Consequently, composite sheets used varied from normal to hybrid carbon fiber reinforced polymers and their applications were modified from completely to sequentially bonded sheets.Sudden debonding of fiber reinforced polymer (FRP) sheets from concrete members is one major concern. The present research investigates the bond stress distribution in CFRP-concrete interface during debonding failure and proposes an effective sequentially bonding CFRP sheets layout to improve load carrying capacity along with ductility. Previous studies revealed that the application of FRP sheets in strengthening reinforced concrete (RC) beams has improved their load carrying capacity but not the ductility. In this study, strengthening of reinforced concrete (RC) beams with hybrid CFRP sheets was proposed to enhance the load carrying capacity and change the brittle mode to ductile failure. Additionally, unreinforced masonry shear walls with openings were retrofitted with CFRP sheets to restore the loss in stiffness and flexural strength due to openings. To perform these investigations, complex three-dimensional nonlinear finite element analysis (FEA) models of structural elements such as concrete blocks, RC beams and unreinforced masonry shear walls strengthened with CFRP sheets were developed. Finite element results of proposed models are as follows:1.The FEA model of CFRP-concrete block double shear test was able to provide a complete set of stress and strain distributions along the bond length which was not possible to obtain experimentally. FEA simulation was able to reveal the distribution of strain amplitude, providing guidance for accurate placement of strain gauges at critical locations during experiment.2.FEA model of CFRP-concrete single bond test with sequential bonding was able to provide the changes in bond stress distribution compared to fully-bonded CFRP-concrete single bond test model. Some of the sequentially bonded FRP-concrete block models gained ductility along with load carrying capacity.3.Through the retrofit of RC beam with hybrid instead of normal CFRP sheets the mode of failure changed from brittle flexural-shear debonding to ductile gradual rupture of hybrid CFRP sheets.4.Masonry shear wall with vertical rectangular opening outperformed the masonry shear walls with square, circular and horizontal rectangular openings in terms of stiffness and lateral in-plane load carrying capacity. Masonry shear walls with multiple openings outperformed the single opening in terms of stiffness and lateral in-plane load carrying capacity. Regardless of the opening shapes, the proposed CFRP sheets layout around the opening of masonry shear walls was effective in improving their stiffness and strength. 2014 English text University of Toledo / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418403567 http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418403567 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection	NDLTD
language	English
sources	NDLTD
topic	Civil Engineering
spellingShingle	Civil Engineering Shrestha, Umesh Shahu Modified Composite Application to Improve Strength and Ductility ofStructural Components
author	Shrestha, Umesh Shahu
author_facet	Shrestha, Umesh Shahu
author_sort	Shrestha, Umesh Shahu
title	Modified Composite Application to Improve Strength and Ductility ofStructural Components
title_short	Modified Composite Application to Improve Strength and Ductility ofStructural Components
title_full	Modified Composite Application to Improve Strength and Ductility ofStructural Components
title_fullStr	Modified Composite Application to Improve Strength and Ductility ofStructural Components
title_full_unstemmed	Modified Composite Application to Improve Strength and Ductility ofStructural Components
title_sort	modified composite application to improve strength and ductility ofstructural components
publisher	University of Toledo / OhioLINK
publishDate	2014
url	http://rave.ohiolink.edu/etdc/view?acc_num=toledo1418403567
work_keys_str_mv	AT shresthaumeshshahu modifiedcompositeapplicationtoimprovestrengthandductilityofstructuralcomponents
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Modified Composite Application to Improve Strength and Ductility ofStructural Components

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