摘要
新老混凝土能够作为整体共同工作是结构加固的关键问题。针对加固设计中经常出现植筋和开槽的技术比选问题,设计了12个试件,比较了植筋与开槽新老混凝土结合面的抗剪性能和破坏形式。试验结果表明:植筋试件破坏具有延性破坏的特征,而开槽试件破坏具有明显脆性破坏的特征,新混凝土在开槽位置被剪断;植筋试件的抗剪承载力明显高于开槽的处理方式。因此,在结构加固设计时建议采用植筋的处理方式,同时应控制植筋深度和植筋间距。
The young-old concrete can work together as a whole is the key issue of structural strengthening.Aiming at the technical selection problem appeared frequently in the bridge strengthening about the young-old concrete interface treatments between bonded rebar and grooving, 12 specimens were designed to compare with the shear performance and failure modes of the young-old concrete interface.The test results show that the failure characteristics of specimens which embedded steel bars are ductile, but the failure characteristics of specimens which slotted are brittle and the new concrete in slot position were cut off.And the young-old concrete interface shear strength of the specimens which embedded steel bars was distinctly stronger than that of the slotted specimens.So, the treatment of bonded rebar is proposed during the structural strengthening design. At the same time,the depth and distance of the bonded rebar should be well controlled.
出处
《混凝土》
CAS
CSCD
北大核心
2012年第6期7-9,16,共4页
Concrete
基金
国家自然科学基金(50978221)
关键词
新老混凝土结合面
植筋
开槽
抗剪承载力
破坏特征
试验
young-old concrete interface
bonded rebar
grooving
shear carrying capacity
failure characteristic
test
