高轴压比配筋PVA纤维增强混凝土柱抗震性能试验研究
发布时间：2019-01-25 20:56
【摘要】：为提高钢筋混凝土柱在高轴压比下的抗震性能,采用聚乙烯醇(PVA)纤维增强混凝土代替普通混凝土是可选择的措施之一。设计6个剪跨比为4的钢筋混凝土柱试件,其中4个试件采用PVA纤维增强混凝土,另外2个对比试件采用普通混凝土,进行拟静力试验以研究高轴压比下的抗震性能。通过改变轴压比和纤维掺量,在水平循环往复荷载作用下,观测试件裂缝开展及破坏过程,研究滞回性能、骨架曲线、延性性能及耗能能力。试验结果表明:高轴压比下,PVA纤维增强钢筋混凝土柱破坏时,裂缝开展缓慢,纤维的桥接作用有效地抑制了裂缝的开展;纤维增强混凝土柱主要表现为延性破坏模式,极限位移角约为普通混凝土柱的1.47倍~1.53倍,表明其具有良好的塑性变形能力和损伤容限;PVA纤维增强钢筋混凝土柱的耗能比约为普通混凝土柱的1.82倍~1.95倍,表明其耗能能力显著提高,抗震性能优越。
[Abstract]:In order to improve the seismic performance of reinforced concrete columns under high axial compression ratio, the use of polyvinyl alcohol (PVA) fiber reinforced concrete instead of ordinary concrete is one of the alternative measures. Six reinforced concrete column specimens with a shear span ratio of 4 were designed, four of which were reinforced with PVA fiber and the other two were made of ordinary concrete. The quasi static tests were carried out to study the seismic behavior of reinforced concrete columns with high axial compression ratio. By changing the axial compression ratio and fiber content, under horizontal cyclic reciprocating load, the fracture development and failure process of the specimen were observed, and the hysteretic properties, skeleton curves, ductility and energy dissipation capacity were studied. The experimental results show that when the PVA fiber reinforced concrete column is destroyed under high axial compression ratio, the crack develops slowly, and the bridging effect of the fiber effectively inhibits the crack development. The ultimate displacement angle of fiber reinforced concrete column is about 1.47 ~ 1.53 times of that of ordinary concrete column, which indicates that it has good plastic deformation ability and damage tolerance. The energy consumption ratio of reinforced concrete columns reinforced with PVA fiber is about 1.82 ~ 1.95 times of that of ordinary concrete columns, which indicates that the energy dissipation capacity of PVA fiber reinforced concrete columns is significantly improved and the seismic performance is superior.
【作者单位】： 兰州理工大学甘肃省土木工程防灾减灾重点实验室;兰州理工大学防震减灾研究所;
【基金】：国家自然科学基金项目(51268036) 甘肃省科技支撑计划项目(1204FKCA126) 教育部长江学者和创新团队发展计划项目(IRT13068)
【分类号】：TU377.9
[Abstract]:In order to improve the seismic performance of reinforced concrete columns under high axial compression ratio, the use of polyvinyl alcohol (PVA) fiber reinforced concrete instead of ordinary concrete is one of the alternative measures. Six reinforced concrete column specimens with a shear span ratio of 4 were designed, four of which were reinforced with PVA fiber and the other two were made of ordinary concrete. The quasi static tests were carried out to study the seismic behavior of reinforced concrete columns with high axial compression ratio. By changing the axial compression ratio and fiber content, under horizontal cyclic reciprocating load, the fracture development and failure process of the specimen were observed, and the hysteretic properties, skeleton curves, ductility and energy dissipation capacity were studied. The experimental results show that when the PVA fiber reinforced concrete column is destroyed under high axial compression ratio, the crack develops slowly, and the bridging effect of the fiber effectively inhibits the crack development. The ultimate displacement angle of fiber reinforced concrete column is about 1.47 ~ 1.53 times of that of ordinary concrete column, which indicates that it has good plastic deformation ability and damage tolerance. The energy consumption ratio of reinforced concrete columns reinforced with PVA fiber is about 1.82 ~ 1.95 times of that of ordinary concrete columns, which indicates that the energy dissipation capacity of PVA fiber reinforced concrete columns is significantly improved and the seismic performance is superior.
【作者单位】： 兰州理工大学甘肃省土木工程防灾减灾重点实验室;兰州理工大学防震减灾研究所;
【基金】：国家自然科学基金项目(51268036) 甘肃省科技支撑计划项目(1204FKCA126) 教育部长江学者和创新团队发展计划项目(IRT13068)
【分类号】：TU377.9
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