腐蚀钢绞线与混凝土的长期粘结蠕变性能试验研究

李富民; 袁迎曙

doi:10.13204/j.gyjz201202016

腐蚀钢绞线与混凝土的长期粘结蠕变性能试验研究

doi: 10.13204/j.gyjz201202016

李富民^1,2,
袁迎曙¹

1.
1. 中国矿业大学力学与建筑工程学院,江苏徐州 221008;
2.
2. 华南理工大学亚热带建筑科学国家重点实验室,广州 510640

基金项目:

国家自然科学基金资助项目(51178454);华南理工大学亚热带建筑科学国家重点实验室开放基金项目(2010KB03)

详细信息

作者简介:
李富民，男，1972年出生，博士，副教授。E－mail:lfmfm@163.com

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- 文章访问数: 111
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- 被引次数: 0
出版历程
- 收稿日期: 2010-02-03
- 刊出日期: 2012-02-20

EXPERIMENTAL STUDY ON BEHAVIOR OF LONG-TERM BOND-CREEP BETWEEN CORRODED STEEL STRANDS AND CONCRETE

Li Fumin^1,2,
Yuan Yingshu¹

1.
1. School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221008,China;
2.
2. State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China

摘要

摘要: 为探讨腐蚀对钢绞线与混凝土长期粘结蠕变性能的影响,制作6根先张法预应力混凝土梁试件,其中5根试件通过掺盐并置于不同环境中进行为期47周不同强度的长期腐蚀,期间对所有6根试件进行定期粘结滑移监测,得到各试件在预应力作用下的粘结滑移时变曲线。结果表明:在未发生锈胀开裂的条件下,腐蚀引起粘结强度增大,从而抑制了粘结蠕变,使腐蚀试件的蠕变滑移小于无腐蚀试件;而且,腐蚀率越高、腐蚀产物体积膨胀率越大,长期粘结滑移也越小。分析表明:如果腐蚀引起锈胀开裂并导致粘结强度退化,则会引起长期粘结蠕变及锚固段裂缝宽度的增大,但不会引起预应力损失及锚固承载力的降低。
- 预应力混凝土结构 /
- 耐久性 /
- 钢绞线腐蚀 /
- 粘结 /
- 蠕变
Abstract: To study the influence of steel strands corrosion on the long-term behavior of bond-creep,6 pre-tensioned prestressed concrete beams were fabricated,of which,5 beams were mixed with salt and set in different places to be corroded in different intensity for 47 weeks,and the bond-slip of all the 6 beams was tested periodically through the whole period,and then the time varying curves of bond-slip under prestressing were obtained.The results show that under the condition of no corrosion crack,the bond strength increases with corrosion and the bond-creep is restrained,which contribute the creep slip of corrosion beams being less than that of the uncorrosion beam.Moreover,with the increase of corrosion rate and corrosion products expansion ratio,the long-term bond-slip decreases.The analysis shows that if there are corrosion cracks and the bond strength deteriorates,the long-term bond-creep and the load cracks width in anchoring segments should increase,but the prestressing loss and the anchoring bearing capacity should not decrease.
- prestressed concrete structures /
- durability /
- corrosion of steel strand /
- bond /
- creep

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参考文献(15)

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