PET纤维布加固锈蚀钢筋混凝土柱抗震性能试验研究

Experimental study on seismic behavior of corroded reinforced concrete column wrapped with PET sheet

采用聚对苯二甲酸乙二醇酯(PET)纤维布对不同箍筋锈蚀程度混凝土方柱进行外包抗震加固。通过对混凝土柱施加水平低周往复荷载,研究了PET纤维布外包损伤钢筋混凝土柱的破坏形态、滞回曲线、刚度退化、骨架曲线及耗能性能,并同一个未损伤柱和一个未损伤加固柱的试验结果进行对比,分析了不同箍筋锈蚀程度、外包PET纤维布体积率对混凝土柱抗震性能的影响。试验结果表明:钢筋混凝土柱在低周反复荷载作用下的破坏模式为脆性剪切破坏,但随着外包PET体积配筋率的增大由脆性剪切破坏变为弯曲-剪切破坏;随着钢筋锈蚀率的增加,损伤柱的受剪承载力、耗能性能及刚度降低;损伤钢筋混凝土柱在经过PET纤维布加固后,试验柱的承载力、刚度退化及抗震耗能性能均得到了显著提高。

Experimental studies on the seismic performance of corroded RC columns wrapped with a new type of FRP made of polyeethylene terephthalate( PET) fibers were carried out. Quasi-static tests were conducted on RC column to investigate their failure modes,hysteresis loops,stiffness degradation,skeleton curves and dissipation capacity.Compared with an unjacketed column without corrosion and one jacketed column without corrosion to mainly discuss the effect of initial damage and layers of PET sheet on the seismic performance of RC columns. It is concluded that the failure mode of RC columns is brittle shear failure,but for columns with large volume fraction of PET sheet is flexuralshear failure. The shear capacity,energy dissipation capacity and stiffness will decrease with the increase of the corrosion ratio,but the bearing capacity,ductility and dissipation capacity will be enhanced with PET sheet.