• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >REINFORCED CONCRETE BEAMS STRENGTHENED USING PRESTRESSED NSM CFRP REINFORCEMENT - EFFECTS OF CFRP GEOMETRY AND FREEZE-THAW EXPOSURE
【24h】

REINFORCED CONCRETE BEAMS STRENGTHENED USING PRESTRESSED NSM CFRP REINFORCEMENT - EFFECTS OF CFRP GEOMETRY AND FREEZE-THAW EXPOSURE

机译：预应力NSM CFRP增强的钢筋混凝土梁-CFRP几何形状和冻融暴露的影响

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

An experimental investigation considering the effects of freeze-thaw exposure, type of strengthening reinforcements, and prestressing levels was conducted on large-scale Reinforced Concrete (RC) beams strengthened in flexure with prestressed and non-prestressed Near-Surface Mounted (NSM) Carbon Fibre Reinforced Polymer (CFRP) reinforcement. Five simply supported rectangular RC beams were tested under four-point bending static monotonic loading: one unstrengthened control beam, two beams strengthened with non-prestressed NSM CFRP, and two beams strengthened with prestressed NSM CFRP. For the strengthened beams, two types of CFRP reinforcements were used including rebars and strips. The prestressing level is 40% of the manufacturer's ultimate tensile strength of the CFRP reinforcement. The strengthened and unstrengthened beams were cracked to a load 20% above the analytical cracking load before being exposed to 500 freeze-thaw cycles (three cycles per day between +34℃ to -34℃). The resulting load-deflection behaviour, strain in CFRP, type of failure, ductility, and energy absorption were compared to the behaviour of similar beams tested without any environmental exposure. The results showed that the freeze-thaw and CFRP geometry have minor effects on the overall flexural behaviour of the beams strengthened with prestressed and non-prestressed NSM CFRP rebars/strips.
机译：对采用预应力和非预应力近表面安装（NSM）碳纤维的挠曲增强的大型钢筋混凝土（RC）梁进行了考虑冻融暴露，加强筋类型和预应力水平的影响的实验研究增强聚合物（CFRP）增强。在四点弯曲静态单调荷载下测试了五个简单支撑的矩形RC梁：一个是未增强的控制梁，两个是用非预应力NSM CFRP加固的梁，两个是用预应力NSM CFRP加固的梁。对于钢筋梁，使用了两种类型的CFRP钢筋，包括钢筋和带钢。预应力水平是制造商的CFRP增强材料极限抗拉强度的40％。加固和未加固的梁在承受500次冻融循环（每天3次循环，在+34℃至-34℃之间）之前，被开裂至比分析开裂载荷高20％的载荷。将所产生的载荷-挠曲特性，CFRP的应变，破坏类型，延展性和能量吸收与未经任何环境暴露测试的类似梁的性能进行了比较。结果表明，冻融和CFRP几何形状对用预应力和非预应力NSM CFRP钢筋/条增强的梁的整体挠曲性能影响较小。

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