碳纤维布及钢板复合加固震损方钢管混凝土框架抗震性能试验研究

Experimental research on seismic behavior of concrete-filled square tube frame strengthened with CFRP and steel plate

为了研究碳纤维布及钢板复合加固震损钢管混凝土框架的抗震性能,按1∶4的缩尺比例设计并制作了3榀3层两跨方钢管混凝土框架模型,进行了模拟地震的预损加载、加固后的低周往复荷载试验.研究了碳纤维布和钢板复合加固震损方钢管混凝土框架结构的有效性,探讨了不同震损程度对加固效果的影响.通过对滞回曲线、骨架曲线、延性系数、耗能能力、刚度退化及强度退化等参数分析可知,在一定损伤程度情况下,采用碳纤维和钢板复合加固后的方钢管混凝土框架,结构的极限承载力、延性性能和耗能能力均有所提高.

In order to study the seismic behavior of concrete-filled rectangular tube frame strengthened with carbon fiber reinforced plastics（CFRP）and steel plate during earthquake,three three-story and two-span concrete-filled square steel tube（CFSST）frame models with 1/4scale were designed and manufactured.The seismic damaged load by simulated earthquake,rehabilitation and the destructions tests under lateral cyclic load on the models were carried out.The effectiveness of strengthening method with CFRP and steel plate seismic-damaged frame and the reinforcement effect on different levels of seismic damage were studied.Based on the test data,the hysteresis curves,skeleton curves,ductility,dissipative ability,ultimate strength and stiffness degradation,etc.were obtained.Results show that the CFSST frame strengthened with CFRP and steel plate meets the requirements of seismic design;and the failure modes of all frames are the bending failure of beam.In a certain extent of damage level,the reinforcement with CFRP and steel plate has a significant effect on increasing the ultimate bearing capacity,improving the displacement ductility and energy dissipation capacity.