【摘要】 利用高延性混凝土(HDC)加固破损混凝土短柱来增大破损混凝土短柱的承载能力和变形能力,延长破损混凝土结构的使用寿命。通过13个HDC加固破损混凝土短柱的轴心受压试验,研究了HDC对破损混凝土的承载能力和变形能力的影响程度。试验结果表明:利用HDC加固破损混凝土短柱,使破损混凝土短柱的峰值应力和应变分别提高了约20%～45%和20%～23%,纵向极限应变增大了约41%～81%,横向极限应变约为加固前的2倍。基于试验结果和回归分析,给出了HDC约束破损混凝土的应力-应变本构方程,提出了HDC约束破损混凝土的承载力公式,且峰值应力的计算值与试验值吻合较好,研究结果可为HDC加固破损混凝土短柱的工程应用提供参考。更多还原

【Abstract】 The high ductile concrete(HDC) with good crack control ability and interface bonding property is used to strengthen short columns of damaged concrete,increase the bearing capacity and deformation capacity of damaged concrete short columns and extend the service life of damaged concrete structures.Through axial compression testing of 13 HDC damaged reinforced concrete short columns,the influence of HDC on the bearing capacity and deformation capacity of damaged concrete is investigated.The experimental results show that:using a good interface bonding capacity of HDC to strengthen damaged concrete short columns,the peak stress and strain of damaged concrete short columns are increased by about 20% to 45% and 20% to 23% respectively.The longitudinal ultimate strain increases about 41% to 81%.The transverse ultimate strain is about two times as high as that before the reinforcement.Based on test results and regression analysis,the stress-strain constitutive equation of HDC confined damaged concrete is obtained and the bearing capacity formula of HDC confined damaged concrete is proposed,and the calculated value of the peak stress is in good agreement with the testing value.更多还原