3/10/2015 Confined Concrete -Strength Arching action(cross-section) Confined Concrete -Strength Arching action(cross-section) *Confinement effective coefficien Equlvalent uniform confinement=Peak strength? 本课件版权归作者所有，仅供个人学习使用，请勿转载。 6
3/10/2015 6 Arching action (cross‐section) Confined Concrete ‐Strength [1] Paultre P, Légeron F. Confinement reinforcement design for reinforced concrete columns[J]. Journal of structural engineering, 2008, 134(5): 738‐749. Arching action (cross‐section) Confinement effective coefficient Confined Concrete ‐Strength [1] Paultre P, Légeron F. Confinement reinforcement design for reinforced concrete columns[J]. Journal of structural engineering, 2008, 134(5): 738‐749. e cc e A k A Ae‐minimum effectively confined core area Acc‐ concrete area enclosed by hoops l el f k f Equivalent uniform confinement Peak strength? 本课件版权归作者所有，仅供个人学习使用，请勿转载
3/10/2015 Confined Concrete -Strength Richart et al.(Chinese Code) f=f+4.1f Wiliam-Warnker(1975) (Mander model) A=2万，a= er.J.B:Prlestley.M.J.N:and Park.R. Confined Concrete -Ductility Ductility()） "The ability of a material,component,connection or structure to undergo inelastic deformations with acceptable stiffness and strength reduction." *Material u->Section u->Member u->Structure u Material ductility is the basis hAs,SmoLD.fndamrekdanhaukeEghemg'womwMeyAors,,ooPy-e 本课件版权归作者所有，仅供个人学习使用，请勿转载。 7
3/10/2015 7 Richart et al. (Chinese Code) Confined Concrete ‐Strength [1] Mander, J. B.; Priestley, M. J. N.; and Park, R., “Theoretical Stress‐Strain Model for Confined Concrete,” J. Struct. Eng., ASCE, V.114, No. 8, 88 fsy=300 Mpa ds=16 mm s=90 mm fc=30 Mpa sm=0.15 cc c l f f f 4.1 Confined strength determination from lateral confining stresses[1] m m 2 01 2 ( ) 60 5 c c bb b f f f Wiliam‐Warnker(1975) (Mander model) compression meridian 1 2 m 2 , 3 c I J Ductility () “The ability of a material, component, connection or structure to undergo inelastic deformations with acceptable stiffness and strength reduction.”[1] Material ‐> Section ‐>Member ‐>Structure Material ductility is the basis Confined Concrete ‐Ductility [1] ] Elnashai A. S., Sarno L. D. “Fundamentals of Earthquake Engineering” [M]. John Wiley & Sons, INC., 2008, P85‐100. 本课件版权归作者所有，仅供个人学习使用，请勿转载