2019, Volume 5, Issue 6
Engineering >> 2019, Volume 5, Issue 6 doi: 10.1016/j.eng.2019.02.012
Material Mechanical Properties Necessary for the Structural Intervention of Concrete Structures
a Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
b College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
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Abstract
Structural intervention involves the restoration and/or upgrading of the mechanical performances of structures. In addition to concrete and steel, which are typical materials for concrete structures, various fiber-reinforced polymers (FRP), cementitious materials with fibers, polymers, and adhesives are often applied for structural intervention. In order to predict structural performance, it is necessary to develop a generic method that is applicable to not only to steel, but also to other materials. Such a generic model could provide information on the mechanical properties required to improve the structural performance. External bonding, which is a typical scheme for structural intervention, is not applied for new structures. It is necessary to clarify material properties and structural details in order to achieve better bonding strength at the interface between the substrate concrete and an externally bonded material. This paper presents the mechanical properties of substrate concrete and relevant intervention material for the following purposes: ① to achieve better shear strength and ultimate deformation of a member after structural intervention; and ② to achieve better debonding strength for external bonding. This paper concludes that some of the mechanical properties and structural details for intervention materials that are necessary for improvement in mechanical performance in structures with structural intervention are new, and differ from those of structures without intervention. For example, high strength and stiffness are important properties for materials in structures without structural intervention, whereas high fracturing strain and low stiffness are important properties for structural intervention materials.
Keywords
Structural intervention ; High fracturing strain ; No yielding ; Low stiffness ; Roughness ; fiber-reinforced polymers ; Polymers
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References
[ 1 ] Jirawattanasomkul T, Zhang D, Ueda T. Prediction of the post-peak behavior of reinforced concrete columns with and without FRP-jacketing. Eng Struct 2013;56:1511–26. link1
[ 2 ] Anggawidjaja D, Ueda T, Dai J, Nakai H. Deformation capacity of RC piers wrapped by new fiber-reinforced polymer with large fracture strain. Cem Concr Compos 2006;28(10):914–27. link1
[ 3 ] Ueda T, Dai J. Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour. Prog Struct Eng Mater 2005;7(1):27–43. link1
[ 4 ] Dai J, Ueda T, Sato Y. Unified analytical approaches for determining shear bond characteristics of FRP-concrete interfaces through pullout tests. J Adv Concr Technol 2006;4(1):133–45. link1
[ 5 ] Dai J, Ueda T, Sato Y. Development of the nonlinear bond stress-slip model of fiber reinforced plastics sheet-concrete interfaces with a simple method. J Compos Constr 2005;9(1):52–62. link1
[ 6 ] Krintrakul N, Ueda T, Takahashi J, Fujima S, Furuuchi H. Improvement of debonding strength with consideration of adhesive layer property and its FEM analysis. J Struct Eng A 2016;62A:23–31. Japanese. link1
[ 7 ] Qian Y, Zhang D, Ueda T. Interfacial tensile bond between substrate concrete and repairing mortar under freeze-thaw cycles. J Adv Concr Technol 2016;14 (8):421–32. link1
[ 8 ] Shrestha J, Ueda T, Zhang D. Effect of primer and surface preparation on the FRPconcrete bond. In: Proceedings of the 7th International Conference on FRP Composites in Civil Engineering; 2014 Aug 22–24; Vancouver, BC, Canada; 2014. link1
[ 9 ] Zhang D, Ueda T, Furuuchi H. Fracture mechanisms of polymer cement mortar: concrete interfaces. J Eng Mech 2013;139(2):167–76. link1
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