{"id":39284,"date":"2024-11-11T13:38:21","date_gmt":"2024-11-11T10:38:21","guid":{"rendered":"https:\/\/repository.qu.edu.iq\/?p=39284"},"modified":"2024-11-12T09:58:14","modified_gmt":"2024-11-12T06:58:14","slug":"journal-of-building-engineering","status":"publish","type":"post","link":"https:\/\/repository.qu.edu.iq\/?p=39284","title":{"rendered":"Journal of Building Engineering"},"content":{"rendered":"<p style=\"text-align: left\"><a href=\"https:\/\/repository.qu.edu.iq\/wp-content\/uploads\/sites\/31\/2024\/11\/\u062f-\u0633\u0644\u0627\u0645-1-1.pdf\">\u062f \u0633\u0644\u0627\u0645 1<\/a>Flexural strengthening of reinforced concrete beams with NSM-CFRP bars<br \/>\nusing mechanical interlocking<br \/>\nSalam Al-Obaidi a,b, Yasir M. Saeed c,*, Franz N. Rad d<br \/>\na Roads and Transportations Engineering Department, University of Al-Qadisiyah, Diwaniyah, 58001, Iraq<br \/>\nb Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy<br \/>\nc Department of Civil and Environmental Engineering, Portland State University, P. O. Box 751, Portland, OR, 97207, USA<br \/>\nd Department of Civil and Environmental Engineering at Portland State University, Portland, OR, 97201, USA<br \/>\nA R T I C L E I N F O<br \/>\nKeywords:<br \/>\nConcrete beams<br \/>\nNear surface mounted<br \/>\nNSM-CFRP<br \/>\nStrengthening<br \/>\nA B S T R A C T<br \/>\nFlexural strengthening of reinforced concrete (RC) beams using near-surface-mounted (NSM) technique has<br \/>\nbecome an attractive alternative for rehabilitation using fiber reinforced polymer (FRP) materials. Previous<br \/>\nstudies have recommended using available anchoring techniques to overcome premature bonding failure. In this<br \/>\nstudy, mechanical interlocking grooves were utilized to delay or prevent debonding failure. The first part of the<br \/>\nstudy aimed to investigate the bond characteristics for NSM-CFRP bars by conducting several pullout tests on No.<br \/>\n6, No.10, and No.13 CFRP bars. Results indicate that mechanical interlocking grooves can significantly enhance<br \/>\nthe bonding capacity and prevent or delay premature bonding failure. In the second part, the proposed NSM<br \/>\nCFRP strengthening technique was used to strengthen nine RC beams. In addition to longitudinal grooves, the<br \/>\nproposed technique consisted of 6 mm wide lateral grooves (or mechanical interlocking) placed at 76 mm on<br \/>\ncenter along the entire length of the strengthened beams. Steel reinforcement ratios of 0.7% and 0.4% were<br \/>\nselected. All beam specimens were tested under four-point bending until failure. Results showed that strengthening<br \/>\nwas more effective for specimens with a lower steel reinforcement ratio. Percentages of enhancement in<br \/>\nflexural strength were between 34-68% and 60\u2013128% for specimens with 0.7% and 0.4% steel reinforcement<br \/>\nratios, respectively. Finally, a simple empirical model was created for the experimental results. Theoretical results<br \/>\nshowed reasonable agreement with the experimental results. However, the maximum load carrying capacity<br \/>\nand flexural stiffness were overestimated for beams with a total reinforcement ratio (steel plus CFRP) larger than<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u062f \u0633\u0644\u0627\u0645 1Flexural strengthening of reinforced concrete beams with NSM-CFRP bars using mechanical interlocking Salam Al-Obaidi a,b, Yasir M. Saeed &#8230; <a class=\"cz_readmore\" href=\"https:\/\/repository.qu.edu.iq\/?p=39284\"><i class=\"fa fa-sign-out\" aria-hidden=\"true\"><\/i><span>\u0642\u0631\u0627\u0621\u0629 \u0627\u0644\u0645\u0632\u064a\u062f<\/span><\/a><\/p>\n","protected":false},"author":31,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,22],"tags":[],"class_list":["post-39284","post","type-post","status-publish","format-standard","hentry","category-uncategorized","category-22"],"_links":{"self":[{"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/posts\/39284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/users\/31"}],"replies":[{"embeddable":true,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=39284"}],"version-history":[{"count":3,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/posts\/39284\/revisions"}],"predecessor-version":[{"id":39289,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=\/wp\/v2\/posts\/39284\/revisions\/39289"}],"wp:attachment":[{"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/repository.qu.edu.iq\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}