受火RC剪力墙加固后的抗震性能试验研究

Experimental Study on Seismic Performance of Post-Fire Reinforced Concrete Shear Wall

针对钢筋混凝土(RC)剪力墙受火后力学性能下降问题,对8榀RC剪力墙试件(包括4榀轴压试件和4榀低周反复加载试件)的抗震性能进行试验研究。通过低周反复荷载试验,对常温状态、四面受火后不加固、四面受火后粘贴角钢加固和四面受火后布置聚合物砂浆钢筋网加固四种工况下,试件的承载力、延性、耗能能力和刚度退化情况进行分析。结果表明:粘贴角钢加固法可显著提高剪力墙受火后的性能,加固后的耗能能力与无损剪力墙相近,但延性未能达到无损构件的水平;聚合物砂浆钢筋网加固法能在一定程度上恢复剪力墙受火的性能,但加固后的延性和耗能能力均无法达到无损构件的水平。

In response to the degradation of mechanical properties of reinforced concrete(RC)shear walls after exposure to fire,an experiment is conducted to investigate the seismic performance of 8 RC shear walls(4 axial compression specimens and 4 low-cycle repeated loading specimens)reinforced with angle steel bonding and polymer mortar reinforced mesh.Through low-cycle repeated load tests,an analysis of load-bearing capacity,ductility,energy dissipation capacity,and stiffness degradation of the specimens is carried out under four conditions:normal temperature,unreinforced after exposure to fire on all sides,reinforced with angle steel after exposure to fire on all sides,and reinforced with polymer mortar reinforced mesh after exposure to fire on all sides.The results show that the angle steel bonding reinforcement can significantly enhance the performance of shear walls after fire with the energy dissipation capacity of the reinforced walls similar to that of undamaged shear walls,but the ductility fails to reach the level of undamaged components.The polymer mortar reinforced mesh reinforcement can restore the performance of shear walls after fire to some extent,but the ductility and energy dissipation capacity of the reinforced walls go below the level of undamaged components.