高延性混凝土加固剪力墙抗震性能试验研究  

Experimental study on seismic behavior of shear wall strengthened with high ductile concrete

作　　者：邓明科[1] 潘姣姣[1] 韩剑 梁兴文[1] DENG Mingke;PAN Jiaojiao;HAN Jian;LIANG Xingwen(College of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Construction Engineering Group Co.,Ltd,Xi'an 710003,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]陕西建工集团有限公司,陕西西安710003

出　　处：《建筑结构学报》2019年第11期45-55,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(51578445)

摘　　要：为研究高延性混凝土(HDC)加固剪力墙的抗震性能,设计了3个剪跨比为2.1的剪力墙试件,采用HDC面层和钢筋网HDC面层进行加固,通过低周往复加载试验,研究其破坏形态、变形能力、耗能能力及刚度退化特性。试验结果表明:未加固试件破坏时,墙体底部混凝土压碎剥落;采用HDC加固的试件,加固层对内部混凝土形成良好的约束作用,提高了试件的耐损伤能力,试件破坏时内部混凝土虽被压碎,但未出现面层剥落现象;与未加固试件相比,HDC面层加固试件的屈服荷载、位移延性系数和耗能能力分别提高12.8%、15.5%和22.0%;在加固层中配置钢筋网,可增加HDC面层与内部混凝土的协同工作能力,进一步提高剪力墙的变形能力和耗能能力,但对承载力的影响较小;加固试件的刚度提高不明显,但刚度退化较为缓慢。考虑HDC加固层作用,建立了HDC加固剪力墙压弯荷载的计算方法,且计算值与试验值均吻合较好。In order to study the seismic behavior of shear walls strengthened with high ductile concrete(HDC),three shear walls with shear-span ratio of 2.1 were designed,which were strengthened with HDC jacket and reinforcing mesh HDC jacket,respectively.The failure type,deformation capacity,energy dissipation capacity and stiffness degradation of the shear walls were investigated through low cyclic loading tests.Test results indicate that the reinforced concrete shear wall fails as the bottom concrete is crushed.The damage resistance ability of the specimens strengthened with HDC jacket is improved due to the confinement effect of HDC jacket on the internal concrete.Although the internal concrete is crushed when the specimen fails,the spalling of HDC layer doesn’t occur.The yield load,displacement ductility factor and energy dissipation capacity of the shear wall specimen are improved by 12.8%,15.5%and22.0%,respectively after strengthened with HDC jacket.Besides,the existing of reinforcing mesh in HDC jacket can enhance the cooperative work ability between HDC and concrete,further improving the deformability and energy dissipation capacity of shear wall,but contributing little to the bearing capacity.The increase in stiffness of the strengthened specimens is not obvious,but the stiffness degradation is improved.Taking the effect of HDC jacket into account,the calculation method for compression-bending capacity of the shear wall strengthened with HDC jacket has been developed and the calculated results agree well with the experimental results.

关 键 词：剪力墙 高延性混凝土 加固 抗震性能 压弯荷载 

分 类 号：TU375.2[建筑科学—结构工程] TU317.1