摘要
采用工程水泥基复合材料(Engineered Cementitious Composite,ECC)沿水平灰缝对砖砌墙体进行嵌缝加固,几乎不改变其外观,符合文物建筑修旧如旧原则.为研究ECC水平嵌缝加固砖砌体的剪切性能,以聚乙烯纤维(PE)、聚乙烯醇纤维(PVA)和混杂纤维(PVA与PE)等不同纤维类型、PE纤维掺量、嵌缝间距和单双面加固为变量,开展砖砌体在剪压作用下的对角剪切试验.对比分析ECC加固砖砌体墙的破坏模式、荷载-位移曲线、剪切强度和延性,探究ECC与砖砌体的协同工作性能.试验结果表明:ECC水平嵌缝加固减缓了砖砌体内部裂缝的开展,提升了试件的抗剪承载力和破坏时的整体性,加固试件的抗剪强度最大提升了44.5%,加固面的最大抗剪刚度约为未加固面的5倍.
The appearance of ancient brick masonry structures strengthened along the horizontal mortar joint with the random distribution short fiber reinforced Engineered Cementitious Composite(ECC)with ultra-high toughness is almost unchanged,which is consistent with the principles of repairing old heritage buildings as the old one.With different fiber types such as polyethylene fiber(PE),polyvinyl alcohol fiber(PVA),and hybrid fiber(PVA and PE)reinforced ECC,the content of PE fiber,caulking spacing,and single-sided or double-sided reinforcement as variables,the diagonal shear test of brick masonry under shear compression was carried out to explore the shear and the cooperative performance of brick masonry reinforced with caulking ECC.The failure pattern,load-displacement curve,shear strength,and ductility are comparatively analyzed.The test results show that caulking ECC slows down the development of internal cracks and improves the shear-bearing capacity and the integrity of brick masonry.The maximum shear strength of the reinforced specimen is increased by 44.5%,and the maximum shear stiffness of the reinforced surface is about 5 times that of the unreinforced surface.
作者
周长东
张晨
景杰婧
ZHOU Changdong;ZHANG Chen;JING Jiejing(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structural Wind Engineering and Urban Wind Environment(Beijing Jiaotong University),Beijing 100044,China;Auditing Department,China Agricultural University,Beijing 100083,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第11期128-135,共8页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52078030,51678039)
关键词
砖砌体结构
工程水泥基复合材料
嵌缝
对角剪切试验
古建砌体加固
brick masonry structure
engineered cementitious composite
caulking
diagonal shear test
strengthening of ancient building
