带铝肋先张预应力复材筋混凝土梁的长期刚度  

INFLUENCE OF ADDITIONAL Al-RIBS ON LONG-TERM STIFFNESS OF PRE-TENSIONED CONCRETE BEAM REINFORCED WITH PRESTRESSED FRP BARS

作　　者：孙瑜[1] 王强[1] 童翊轩 朱虹[1] SUN Yu;WANG Qiang;TONG Yixuan;ZHU Hong(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;Dreaming Information Technology Corporation of Shanghai,Shanghai 200051,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]上海寻梦信息技术有限公司,上海200051

出　　处：《工业建筑》2021年第10期9-13,共5页Industrial Construction

基　　金：国家自然科学基金项目(52078127)。

摘　　要：长期黏结性能退化会导致复材筋与混凝土之间的不可控滑移问题,附加铝肋是提高黏结性能的有效方式。为研究铝肋对抑制预应力复材筋混凝土梁长期刚度退化的作用,设计制作了6个试件,依次开展了短期和长期加载试验。通过对比梁端部无铝肋的试件,综合研究了铝肋对长期挠度、复材筋滑移和裂缝发展的影响规律。结果表明:附加铝肋能够显著抑制构件长期挠度的发展,使预应力复材筋混凝土梁保持良好的长期性能;设置了短铝肋(SA)和长铝肋(LA)的试件,相较于无铝肋试件,最大滑移分别减少了81.3%和86.7%,筋材滑移得到有效抑制;无铝肋试件近固定端裂缝宽度增加了323.53%,远大于有铝肋试件,附加铝肋对剪跨区混凝土裂缝发展的抑制效果明显。Degradation of long-term bonding performance will cause uncontrollable slippage between FRP bars and concrete. The additional Al-ribs are effective ways to improve bonding performance. In order to study the effect of Alribs on restraining the long-term stiffness degradation of prestressed concrete beams reinforced with FRP bars,6 specimens were designed and fabricated,and short-term and long-term loading tests were carried out in sequence. By comparing the specimens without Al-ribs at the beam ends,the influence of Al-ribs on long-term deflection,slippage of FRP bars and development of crack width was comprehensively studied. The results showed that the additional Alribs could significantly inhibit the development of long-term deflection of the members,so that the prestressed concrete beams reinforced with FRP bars maintained good long-term performance. The maximum slippage of the specimens with short Al-ribs(SA) and long Al-ribs( LA) was reduced by 81. 3% and 86. 7%,respectively,and the slippage of the ribs was significantly suppressed. The crack width near the fixed end of the specimens without Al-ribs was increased by 323. 53%,which was much larger than that of the specimens with Al-ribs. The additional Al-ribs had a significant effect on restraining the development of concrete cracks in the shear span area.

关 键 词：先张法预应力 复材筋 铝合金附加肋 长期刚度 

分 类 号：TU375.1[建筑科学—结构工程]