论文部分内容阅读
钢筋锈蚀以致局部箍筋锈断将会降低混凝土柱的抗震性能,采取碳纤维增强材料(CFRP)加固方法可对此类锈蚀钢筋混凝土柱的抗震性能进行修补。基于28根T形柱的试验研究,初步揭示了钢筋锈蚀率、轴压比、CFRP加固方式和加固层数对混凝土柱抗震性能影响规律。钢筋锈蚀会导致混凝土柱的耗能能力、刚度、承载力和延性不同程度的降低。当钢筋锈蚀率达到15%时,混凝土柱的延性系数下降约40%。经过CFRP加固后,锈蚀柱的滞回环变得较为饱满,耗能能力大大增强,其延性系数可提高约40%,耗能能力可提高约80%。
Corrosion of steel bars causes the local stirrups to be rusty, which will reduce the seismic performance of concrete columns. The CFRP reinforcement method can be used to repair the seismic performance of such corroded reinforced concrete columns. Based on the experimental study of 28 T-shaped columns, the influence of corrosion rate, axial compression ratio, CFRP reinforcement mode and the number of reinforced layers on the seismic performance of concrete columns is preliminary revealed. Steel corrosion can lead to concrete column energy dissipation capacity, stiffness, bearing capacity and ductility reduce to varying degrees. When the corrosion rate reaches 15%, the ductility of concrete columns decreases about 40%. After CFRP strengthening, the hysteresis loop of the corrosion column becomes more full, the energy dissipation capacity is greatly enhanced, the ductility coefficient can be increased by about 40%, and the energy dissipation capacity can be increased by about 80%.