基于Pushover方法分析的受腐蚀钢筋混凝土柱抗震性能评价

Seismic evaluation of corroded reinforced concrete columns based on Pushover analysis

根据先前对受腐蚀钢筋混凝土偏心受压构件低周反复性能的试验研究结果,提出了构件滞回耗能与钢筋锈蚀率的关系,结合先前提出的受腐蚀构件的恢复力骨架曲线的计算模型,采用Pushover方法对地震作用下的受腐蚀钢筋混凝土构件的变形性能进行了分析,得到钢筋锈蚀率与结构弹塑性变形的关系。分析结果表明,随着钢筋锈蚀率的增大,钢筋混凝土构件的变形呈非线性增大,地震强度越大,结构变形随钢筋锈蚀率增加的越快。在规定的变形要求下,随钢筋锈蚀率的增大,结构可承受的地震作用呈非线性降低,钢筋锈蚀越严重,构件在相同变形下承受地震作用的能力越弱。

Based on previous experimental results of the low cycle behavior of corroded reinforced concrete members subjected to eccentric compression, the relation between hysteretic consumption and rebar corrosion rate was provided. By analyzing the deformation of corroded reinforced concrete members with Pushover method, the relation between rebar corrosion rate and elastic-plastic deformation was investigated with the skeleton curve restoring model of corroded members proposed previously by authors. Analysis results indicate that deformation of reinforced concrete members nonlinearly increases with the increase of rebar corrosion rate. The greater the earthquake intensity, the faster the increase of structural deformations along with the rebar corrosion rate. Within specified structural deformations, the bearing capacity of structures nonlinearly degrades with the increase of rebar corrosion rate.