层内混杂FRP加固混凝土剪力墙抗震性能试验
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摘要
为了将延性好的混杂纤维布(HFRP)用于结构抗震加固,试验研究了4个HFRP加固钢筋混凝土剪力墙的抗震性能,分析了HFRP加固剪力墙的破坏特征、滞回曲线、延性、骨架曲线以及耗能能力,探讨了剪跨比对HFRP加固效果的影响.试验表明:粘贴HFRP能使混凝土剪力墙刚度退化变缓,HFRP对减缓低矮剪力墙刚度退化的作用要优于中高剪力墙;HFRP能显著提高剪力墙的延性,对改善中高剪力墙延性的作用更加明显;HFRP加固剪力墙试件的延性、耗能性能良好,滞回曲线丰满,捏拢程度变轻。
In order to research the feasibility of structural seismic retrofit with Hybrid FRP(HFRP),which has a good ductility,four reinforced concrete shear walls were tested to investigate the performances such as failure mode of shear walls,ductility,hysteretic curves,skeleton curves and energy consumption strengthened with HFRP in this paper.The effect of shear span ratio on the seismic performance of shear walls strengthened with HFRP were studied herein.The results show that the stiffness would degrade slowely if shear walls are strengthened with HFRP.This effect is more obvious to low-rise shear wall than that to mid-rise shear wall.Strengthening the shear walls with the new-style HFRP herein would have a great effect on improving the ductility and capacity of energy consumption,and it's more effective to mid-rise shear wall than low-rise one.Concrete Shear walls strengthened with HFRP would have good ductility and capacity of energy consumption,the hysteretic curves are fat and the pinching behavior becomes light.
In order to research the feasibility of structural seismic retrofit with Hybrid FRP(HFRP),which has a good ductility,four reinforced concrete shear walls were tested to investigate the performances such as failure mode of shear walls,ductility,hysteretic curves,skeleton curves and energy consumption strengthened with HFRP in this paper.The effect of shear span ratio on the seismic performance of shear walls strengthened with HFRP were studied herein.The results show that the stiffness would degrade slowely if shear walls are strengthened with HFRP.This effect is more obvious to low-rise shear wall than that to mid-rise shear wall.Strengthening the shear walls with the new-style HFRP herein would have a great effect on improving the ductility and capacity of energy consumption,and it's more effective to mid-rise shear wall than low-rise one.Concrete Shear walls strengthened with HFRP would have good ductility and capacity of energy consumption,the hysteretic curves are fat and the pinching behavior becomes light.
引文
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[2]杨曌,朱刚,黄仁静.碳纤维布加固砖墙抗震受剪承载力分析[J].武汉理工大学学报,2007,29(3):96-98.YANG Zhao,ZHU Gang,HUANG Ren-jing.Analysis onseismic shear capacity of brick wall strengthened by CFRP[J].Journal of Wuhan University of Technology,2007,29(3):96-98.(in Chinese)
[3]张宇,金峤,周晶.基于性能的既有砌体结构隔震加固研究[J].工程抗震与加固改造,2010(6):20-23.ZHANG Yu,JIN Qiao,ZHOU Jing.Research onperformance-based isolated technique for existing masonrystructures[J].Earthquake Resistant Engineering andRetrofitting,2010(6):20-23.(in Chinese)
[4]廖子建,张鹏程,林树枝.砌体防倒塌钢桁架加固方法研究[J].工程抗震与加固改造,2011(2):24-28.LIAO Zi-jian,ZHANG Peng-cheng,LIN Shu-zhi.Studyon the strengthen method of masonry structure by steel trussfor collapse prevention[J].Earthquake ResistantEngineering and Retrofitting,2011(2):24-28.(inChinese)
[5]章红梅,吕西林.粘钢加固钢筋混凝土剪力墙抗震性能试验研究[J].结构工程师,2007,23(1):72-76.ZHANG Hong-mei,LXi-lin.Experiment study onseismic behavior of reinforced concrete walls strengthenedby bonded steel[J].Structural Engineers,2007,23(1):72-76.(in Chinese)
[6]曾洪超.FRP加固混凝土竖向构件的抗震性能研究[D].北京:北京工业大学建筑工程学院,2010.ZENG Hong-chao.Study onseismic performance of RCvertical components strengthened with FRP[D].Beijing:College of Civil Engineering and Architecture,BeijingUniversity of Technology,2010.(in Chinese)
[7]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:336-337.
[8]曹万林,吴定燕,杨兴民,等.双向单排配筋混凝土低矮剪力墙抗震性能试验研究[J].世界地震工程,2008,24(4):19-24.CAO Wan-lin,WU Ding-yan,YANG Xing-min,et al.Experimental study on seismic performance of low-rise RCshear walls with bi-directional single row of steel bars[J].World Earthquake Engineering,2008,24(4):19-24.(in Chinese)
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