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碳纤维增强复合材料(CFRP)布和角钢复合加固钢筋混凝土结构,可以同时发挥两种加固材料的优势。针对两榀严重受损的钢筋混凝土框架,首先用CFRP布加固出现明显损伤的框架梁、柱和节点;而后在框架节点和框架柱固定端反粘由钢板焊接的加腋角钢并用螺栓固定。对加固后的框架试件进行模拟地震作用下的水平低周反复荷载试验,研究CFRP布和加腋角钢复合加固损伤混凝土框架的受力性能。试验结果表明:复合加固框架的刚度退化和承载力退化均较均匀,未发生突变,可以较好防止结构突然性倒塌;CFRP布的耗能能力较差,但加腋角钢的钢板可达到最大承载力;随着加腋角钢节点钢板肢长的增大,复合加固框架的耗能能力增强,加固框架的抗震能力提高。
Carbon fiber reinforced plastic (CFRP) fabric and angle steel reinforced concrete structure, can play the advantages of both reinforced materials. For the severely damaged RC frame, the CFRP cloth is used to reinforce the obviously damaged frame beams, columns and joints. Then, the frame joints and the fixed ends of the frame columns are anti-bonded by steel plates and bolted together. The strengthened frame specimens were subjected to horizontal low-cycle cyclic loading tests under simulated earthquakes to study the mechanical behavior of concrete frames reinforced with CFRP and axillage beams. The experimental results show that the stiffness degradation and the degradation of the bearing capacity of the composite reinforced frame are uniform and no sudden change occurs, which can prevent the structure from collapse suddenly. The CFRP fabric has poor energy dissipation capacity, but the steel plate with axillage can reach the maximum load With the increase of limb length of steel axles, the energy dissipation capacity of the composite reinforced frame increases and the seismic resistance of the reinforced frame increases.