• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composite Structures >Fatigue behavior of RC beams strengthened with prestressed NSM CFRP rods
【24h】

Fatigue behavior of RC beams strengthened with prestressed NSM CFRP rods

机译：预应力NSM CFRP筋加固RC梁的疲劳性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The fatigue performance of Reinforced Concrete (RC) beams strengthened using NSM CFRP rods was examined in this study. The testing matrix consisted of one un-strengthened beam and four beams strengthened using NSM CFRP rods prestressed to effective strain values of 0,3260,6899, and 9177 u, representing 0%, 20.4%, 43.1%, and 57.4% of the CFRP rod ultimate tensile strain, 1.6%. All beams were tested in four-point bending under fatigue conditions representing in-service loading for 3 million cycles at a frequency of 2 Hz. Upper and lower load limits were chosen to induce a stress range of 125 MPa in the tension steel during the first cycle. The fatigue results were compared with experimental test results of identical beams strengthened using prestressed NSM CFRP strips tested under identical fatigue conditions found elsewhere in literature. Test results showed that all strengthened beams experienced deflection increase lower than that of the un-strengthened beam which indicates the efficiency of the strengthening process in reducing the damage accumulation. Also, the percentage deflection increase as well as the stiffness degradation after 3 million cycles are almost the same for all the strengthened beams which indicates that damage accumulation is independent from the prestress level. The groove dimensionality, rather than the CFRP geometry, has a detrimental effect on the bond behavior.
机译：在本研究中，研究了使用NSM CFRP棒加固的钢筋混凝土（RC）梁的疲劳性能。测试矩阵由一根未加固的梁和四根使用NSM CFRP杆加固的梁组成，预应力到有效应变值为0,3260,6899和9177 u，分别占CFRP的0％，20.4％，43.1％和57.4％杆的极限拉伸应变为1.6％。所有梁都在疲劳条件下进行了四点弯曲测试，代表了2 Hz频率下的300万次运行载荷。选择上限和下限载荷以在第一周期内在拉力钢中产生125 MPa的应力范围。将疲劳结果与使用在文献中其他地方发现的相同疲劳条件下测试的预应力NSM CFRP筋加固的相同梁的试验结果进行比较。试验结果表明，所有受力梁的挠度增加均低于未受力梁，这表明加强过程在减少损伤累积方面的效率。同样，对于所有加固的梁，在300万次循环之后，挠曲百分比的增加以及刚度的降低几乎相同，这表明损伤累积与预应力水平无关。凹槽尺寸而不是CFRP几何形状对粘结行为具有不利影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号