7301

6807

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1391

ده، 150ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمدرضا افتخار

27/8/91

محمدزمان كبير، داوود مستوفي نژاد

1396/09/21

كتابنامه

عمران

مهندسي عمران

ID6807

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Holing as a method to replace surface preparation in Strengthened Concrete Beams with CFRP Composites Morteza Yaghobi morteza yaghobi@cv iut ac ir 28 August 2012 Department of Civil Engeenering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi Supervisor Dr M R Eftekhar eft@cc iut ac irAbstract Strengthening and repairing of structures is an inseparable part of building which has beenconsiderate from old In recent years using of FRP composite laminates in strengtheningreinforced concrete structures and even steel structures is very considerate One of the mostimportant FRP applications is bending strengthening reinforced concrete beams with bonding FRPon the tension face of beam Basic problem in strengthened concrete beams with FRP laminates ispremature debonding of sheet from concrete surface which induced precocious failure structuralmember Of most important reasons of debonding is unpreparedness of concrete surface in order togood bonding to composite sheet Surface preparation of concrete is typically associated with suchconstraints as expense of operation inaccessibility easy to the member creation of dust andpollution of environment and thereupon impossibility of servicing of structure in duringstrengthening operation Thus in this study possibility substituting holing new method to surfacepreparation in bending strengthening concrete beams with FRP sheets investigated Also attemptedwhich deferent parameters of this method investigate The experimental specimens used in this study included 120 prism specimens of dimensions100 100 500 mm which subjected to 4 point flexural loading The specimens were divided intodeferent groups and strengthened with FRP composites to deferent methods Also severalspecimens tested in state without strengthened Used methods for strengthened specimens areincluded without surface preparation with surface preparation holing holing with nailing andholing with anchoring sheet in end holes The results indicated that surface preparation of concretecan increase ultimate failure load Using of holing lieu surface preparation cause increasingultimate failure load Also with using supplementary methods nailing and anchoring strengtheningsheet in end holes in addition to increasing ultimate failure load failure mode change fromdebonding to rupture of sheet too Key Words Bending Strengthening Debonding FRP Composite laminates Surfacepreparation Holing

محمدرضا افتخار

محمدزمان كبير، داوود مستوفي نژاد