东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (9): 1342-1347.DOI: 10.12068/j.issn.1005-3026.2018.09.025

• 资源与土木工程 • 上一篇    下一篇

超载下预应力CFRP布加固腐蚀钢梁抗弯性能试验

侯雯峪， 王连广   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2017-06-02 修回日期:2017-06-02 出版日期:2018-09-15 发布日期:2018-09-12
  • 通讯作者: 侯雯峪
  • 作者简介:侯雯峪(1987-)，女，辽宁本溪人，东北大学博士研究生； 王连广(1964-)，男，辽宁鞍山人，东北大学教授，博士生导师.冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51504125); 辽宁省自然科学基金资助项目(20170540303).国家自然科学基金资助项目(51171041).

Flexural Behavior of Corroded Steel Beams Strengthened with Prestressed CFRP Sheets Under Overloading

HOU Wen-yu， WANG Lian-guang   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2017-06-02 Revised:2017-06-02 Online:2018-09-15 Published:2018-09-12
  • Contact: WANG Lian-guang
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摘要： 为研究预应力CFRP布加固腐蚀钢梁静载、超载的抗弯性能，进行了7根钢梁的抗弯试验，研究了加固梁在静载及超载下的破坏形态、承载力和刚度.结果表明，加固钢梁可以提高钢梁的承载力与刚度，预应力的存在，可以显著提高CFRP布的利用率;腐蚀程度影响钢梁的刚度与极限承载力，腐蚀程度增加1倍，钢梁的承载力降低50%左右.超载次数增加，钢材发生时效硬化，钢梁刚度可提高13%左右，但承载力有所降低;超载下，预应力的施加可提高钢梁的延性.建立了预应力CFRP布加固腐蚀钢梁的承载力计算公式，理论计算结果与试验结果吻合良好.

关键词: 超载, 预应力CFRP布, 腐蚀钢梁, 时效硬化, 刚度

Abstract: In order to investigate the flexural behavior of corroded steel beams strengthened with prestressed CFRP sheets under static loading or overloading， the bending tests of seven steel beams were carried out to study the failure mode， bearing capacity and stiffness of the corroded steel beams. The results showed that the CFRP sheets could improve the stiffness and bearing capacity， and adding prestress to the steel beam could remarkably improve the use of CFRP sheets. The corrosion could influence both the stiffness and bearing capacity. The bearing capacity decreased by about 50% when the corrosion degree increased by 1 times. The improvement of the overloading numbers can improve the stiffness by 13% because of the steel’s age hardening， but the bearing capacity can reduce. And the prestress can improve the ductility of the steel beam. The formula of ultimate bearing capacity was established， and the calculated results agreed well with the experimental results.

Key words: overloading, prestressed CFRP sheets, corroded steel beam, age hardening, stiffness

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