{"title":"Strain-Based Design Model for FRP-Confined Concrete Columns","authors":"N. Sáenz, C. Pantelides","doi":"10.14359/14878","DOIUrl":"https://doi.org/10.14359/14878","url":null,"abstract":"Synopsis: A constitutive strain-based confinement model is developed herein for circular concrete columns confined with fiber reinforced polymer (FRP) composites. A series of relationships were developed from experimental data, which facilitated the establishment of the strain-based model. The FRP-confined concrete constitutive model calculates the internal damage of the column by using the radial strain. The radial and axial strains at zero volumetric strain were used to mark the beginning of effective dilation response of the FRP composite jacket. The secant concrete modulus was used in the model and expressed as a function of the secant modulus softening rate, which depends on the ultimate radial to axial strain ratio. The experimental relationship for the ultimate radial to axial strain ratio is a function of the normalized effective confining stiffness. The secant modulus softening rate is constant throughout the plastic stress-strain response until failure. The FRP-confined concrete constitutive model evaluates the ultimate radial strain, which was related to the FRP composite effectiveness. The FRP-confined concrete model predicts the stress-strain response accurately for any normalized effective confinement stiffness.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126117049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance of Double-T Prestressed Concrete Beams Strengthened with Steel Reinforced Polymer","authors":"P. Casadei, A. Nanni, T. Alkhrdaji, Jay Thomas","doi":"10.14359/14865","DOIUrl":"https://doi.org/10.14359/14865","url":null,"abstract":"In the fall of 2002, a two-storey parking garage in Bloomington, Indiana, built with precast prestrestressed concrete (PC) double-T beams, was decommissioned due to a need for increased parking-space. This led to the opportunity of investigating the flexural performance of the PC double-T beams, upgraded in the positive moment region with steel reinforced polymer (SRP) composite materials, representing the first case study where this material has been applied in the field. SRP makes use of high- strength steel cords embedded in an epoxy resin. This paper reports on the test results to failure of three beams: a control specimen, a beam strengthened with one ply of SRP and a third beam strengthened with two plies of SRP anchored at both ends with SRP U-wraps. Results showed that SRP can significantly improve both flexural capacity and enhance pseudo-ductility. Preliminary analytical work shows that the same approach used for externally bonded fiber reinforced polymer (FRP) can be satisfactorly used for SRP.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115167714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Out-of-Plane Bending of URM Walls Strengthened with FRP Strips –Modeling and Analysis","authors":"E. Hamed, O. Rabinovitch","doi":"10.14359/14836","DOIUrl":"https://doi.org/10.14359/14836","url":null,"abstract":"Synopsis: The modeling and analysis of un-reinforced masonry walls strengthened with externally bonded unidirectional composite laminates and subjected to out-ofplane loading is investigated. The model is based on variational principles, static equilibrium, and compatibility between the structural components, which include the masonry units (blocks), the mortar joints, the FRP strips, and the adhesive layers. The modeling of the masonry block and the mortar joints follows the small displacements and the Bernoulli-Euler beam theories. The strengthening FRP strips are modeled following the lamination theory and the adhesive layers are modeled as two dimensional linear elastic continuum. The effects of cracking of the mortar joints and the debonding of the composite laminates near the mortar joints are also considered. A numerical example is presented. The numerical results quantitatively describe some of the phenomena that govern the behavior of the strengthened wall and may lead to its failure. A summary and conclusions close the paper.","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121706378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Tensile Capacities of CFRP Anchors","authors":"G. Ozdemir, U. Akyuz","doi":"10.1007/1-4020-4571-9_31","DOIUrl":"https://doi.org/10.1007/1-4020-4571-9_31","url":null,"abstract":"","PeriodicalId":151616,"journal":{"name":"SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117013793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}