反复荷载下锈蚀黏结退化的RC结构数值模拟

为了反映钢筋锈蚀对混凝土结构抗震性能的影响,从黏结滑移本构关系出发,推导了钢筋屈服滑移量的计算公式,对考虑节点屈服应变渗透的黏结滑移恢复力模型进行修正;通过引入锈蚀钢筋黏结滑移本构关系,提出了考虑钢筋锈蚀引起黏结退化的黏结滑移恢复力修正模型.利用修正模型,引入锈蚀钢筋本构关系,在OpenSees平台下,对钢筋不同程度锈蚀下的组合件进行了反复荷载作用下的数值模拟,结果与基于试验的受腐蚀混凝土构件恢复力模型的分析结果吻合良好,证明数值模拟方法合理可行.数值分析表明,同时考虑黏结滑移和锈蚀钢筋本构关系的改变,当锈蚀率超过3%时,锈蚀的影响即已明显.

Numerical Simulation of Reinforced Concrete Structures Under Cyclic Loads: The Effects of Bond Deterioration due to Reinforcement Corrosion

Bond-slip model including strain-penetration effects was modified to better consider how bond deterioration, caused by corrosion of the reinforcement, affects seismic performance. A constitutive law for bond-slip, including corrosion effects, was used to deduce a yield-slip formula for use in the model. An OpenSees platform was studied with the modified model by examining nonlinear behavior of a beam-column sub-assembly under cyclic loading. Simulations agree with the restoring-force model of corroded reinforced concrete that is based upon experimental data. This proves the utility of the new modified model. Simulations indicate that after three percent corrosion the effect on bond strength is obvious and that constitutive relationships must then take this into consideration.