3/10/2015 Confined Concrete -Mechanism T f= Confined Concrete -Strength *Arching action *Assumption: 1.2nd degree parabolas 2.Initial tangent slope of 45] Weak section-middle 国 pressure 本课件版权归作者所有，仅供个人学习使用，请勿转载。 5 3/10/2015 5 Confined Concrete ‐Mechanism c fl Rcor Tu=fsyAss1 Tu u sy ss1 l cor cor T f A f q R R   ? l f    Arching action  Assumption: 1. 2nd degree parabolas 2. Initial tangent slope of 45°[1]  Weak section‐ middle 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, 1988. q q Spacing Confinement pressure 本课件版权归作者所有，仅供个人学习使用，请勿转载