摘要
该文为改善高性能混凝土剪力墙的抗震性能,提出在剪力墙塑性铰区采用延性纤维混凝土(DFRC),设计了4片剪跨比为2.1的剪力墙试件,并进行了拟静力试验。通过改变DFRC区高度、轴压比和约束箍筋数量,研究其破坏机理、耗能能力及变形性能。结果表明:1)塑性铰区采用DFRC的剪力墙试件弹性阶段变长,剪力墙屈服后承载力降低缓慢;2)DFRC可有效控制剪力墙塑性铰区的弯剪斜裂缝的宽度,防止塑性铰区发生剪切破坏;3)DFRC区高度增大,剪力墙的变形和耗能能力明显提高,DFRC区约束箍筋数量增加,试件变形和耗能能力提高;4)塑性铰区采用DFRC的剪力墙试件,塑性铰区损伤程度明显降低,对减轻剪力墙的地震破坏程度具有重要作用。
In order to improve the aseismic behavior of high performance concrete shear walls, 4 specimens of shear walls with ductile fibre reinforced concrete(DFRC) in the plastic region and shear span ratios of 2.1 were designed and the quasi-static tests were carried out. The failure mechanism, energy dissipation capacity and deformability of shear walls were studied under various DFRC zone height, axial compression ratios and confinement stirrup. The research shows that: 1) DFRC in the plastic region of shear walls can extend the rage of an elastic stage and delay the decreasing of bearing capacity after yield; 2) DFRC in the plastic region of the shear walls can control the width of flexural-shear cracks and prevent shear failure; 3) the deformability and energy dissipation capacity can be improved significantly with the increase of DFRC zone height and confinement stirrup in DFRC; 4) DFRC in the plastic region of shear walls can reduce the damage degree in the plastic region obviously and it is important to reduce the earthquake damage of shear walls.
出处
《工程力学》
EI
CSCD
北大核心
2014年第7期170-177,共8页
Engineering Mechanics
基金
国家自然科学基金项目(51278402
51078305
50908187)
陕西省自然科学基金项目(2013JM7013)
西安理工大学博士启动基金项目(118-211206)
关键词
延性纤维混凝土
剪力墙
抗震性能
延性
变形能力
ductile fibre reinforced concrete
shear walls
seismic behavior
ductility
deformability
