Open AccessInterpreting Conservativeness in Design Criteria for Flexural Strengthening of RC Structures Using Externally Bonded FRP
Author(s) -
Kunal Kansara,
Tim Ibell,
Antony Darby,
Mark Evernden
Publication year - 2010
Publication title -
international journal of concrete structures and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.758
H-Index - 29
eISSN - 2234-1315
pISSN - 1976-0485
DOI - 10.4334/ijcsm.2010.4.1.025
Subject(s) - fibre reinforced plastic , flexural strength , ductility (earth science) , parametric statistics , structural engineering , engineering design process , computer science , solid mechanics , range (aeronautics) , mathematical optimization , mathematics , materials science , engineering , mechanical engineering , composite material , creep , statistics
This paper presents the influence of various flexural strengthening design criteria specified by three important design guidelines (ACI440, TR55, FIB14) on the resulting strength, ductility and conservativeness of FRP strengthened RC elements. Various generalised mathematical relations in non-dimensional form are presented that can be employed to develop design aids for the FRP-strengthening process. A design methodology is prescribed based on these equations enabling the designer to optimally and intuitively incorporate sufficient ductility while designing for strength. In order to better interpret conservativeness within design codes, four distinct levels of embedded conservativeness are identified, which cover the entire range of sources of conservativeness. Finally, a detailed parametric study is presented, using the proposed design equations and methodology, to determine the influence of each of these four levels of conservativeness on final design solutions. Specific criteria that are useful while calibrating design guidelines are also presented