带铝肋先张预应力复材筋混凝土梁的长期刚度

孙瑜; 王强; 童翊轩; 朱虹

doi:10.13204/j.gyjzG21042510

带铝肋先张预应力复材筋混凝土梁的长期刚度

doi: 10.13204/j.gyjzG21042510

孙瑜¹,
王强¹,
童翊轩^1,2,
朱虹^1, ,

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

基金项目:

国家自然科学基金项目（52078127）

详细信息

作者简介:
孙瑜,男,1996年出生,硕士研究生

通讯作者:
朱虹,女,1975年出生,博士,教授,101010656@seu.edu.cn。

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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-25
- 网络出版日期: 2022-02-21

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

SUN Yu¹,
WANG Qiang¹,
TONG Yixuan^1,2,
ZHU Hong^{1
, ,}

1. Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China;
2. Dreaming Information Technology Corporation of Shanghai, Shanghai 200051, China

摘要

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。
- 先张法预应力 /
- 复材筋 /
- 铝合金附加肋 /
- 长期刚度
Abstract: 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 Al-ribs 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 Al-ribs 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.
- pre-tensioned prestress /
- FRP bar /
- additional Al-rib /
- long-term stiffness

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