工程力学 ›› 2018, Vol. 35 ›› Issue (11): 106-114,154.doi: 10.6052/j.issn.1000-4750.2017.07.0555

• 土木工程学科 • 上一篇    下一篇

预应力钢带加固RC框架节点抗震性能试验研究

杨勇1, 陈展1, 王念念1, 张波1,2   

  1. 1. 西安建筑科技大学土木工程学院, 陕西, 西安 710055;
    2. 陕西理工大学土木工程与建筑学院, 陕西, 汉中 723000
  • 收稿日期:2017-07-18 修回日期:2017-12-26 出版日期:2018-11-07 发布日期:2018-11-07
  • 通讯作者: 陈展(1993-),男,陕西人,硕士生,从事工程结构抗震与加固研究(E-mail:15091832276@163.com). E-mail:15091832276@163.com
  • 作者简介:杨勇(1976-),男,江西人,教授,工学博士,博导,从事钢-混凝土组合结构、工程结构抗震与加固研究(E-mail:yyhhp2004@163.com);王念念(1993-),男,安徽人,硕士生,从事工程结构抗震与加固研究(E-mail:757310770@qq.com);张波(1976-),男,陕西人,副教授,博士,从事工程结构抗震与加固研究(E-mail:zhangyc_2005@126.com).
  • 基金资助:
    国家重点研发计划项目(2016YFC0701400);西安市科技计划项目(CXY1432(5))

EXPERIMENTAL STUDY ON ASEISMIC BEHAVIOR OF RC BEAM-COLUMN JOINTS STRENGTHENED WITH PRESTRESSED STEEL STRIPS

YANG Yong1, CHEN Zhan1, WANG Nian-nian1, ZHANG Bo1,2   

  1. 1. School of Civil Engineering, Xi'an University of Architecture and Technology, Shaanxi, Xi'an 710055, China;
    2. School of Civil Engineering and Architecture, Shaanxi University of Technology, Shaanxi, Hanzhong 723000, China
  • Received:2017-07-18 Revised:2017-12-26 Online:2018-11-07 Published:2018-11-07

摘要: 在对现有节点加固技术分析研究的基础上,该文提出预应力钢带加固RC梁柱节点技术。为验证预应力钢带加固技术的有效性,对4个预应力钢带加固试件和1个未加固试件在水平低周反复荷载作用下的抗震性能进行了试验研究。研究节点核心区钢带间距、邻近核心区的梁端钢带间距和预应力钢带加固位置对加固后节点抗震性能的影响,并对各试件的破坏形态、滞回性能、耗能和延性性能等抗震性能指标进行分析。试验结果表明:预应力钢带能有效抑制节点核心区裂缝的开展,减小节点核心区的剪切变形,提高节点核心区抗剪承载能力,实现破坏位置和破坏形态的改变,加固试件的破坏形态由未加固试件的梁端弯曲-节点剪切破坏变为梁端弯曲破坏,加固后试件的承载力、耗能、延性和刚度退化等抗震性能指标均有明显提高。

关键词: 预应力钢带, 梁柱节点, 加固, 抗震性能, 试验研究

Abstract: A new method for retrofitting the RC beam-to-column joints with prestressed steel strips was proposed, based on the analysis and navigation of existing retrofitting methods. The experimental study on 4 specimens retrofitted with prestressed steel strips and 1 specimen without retrofit were performed to investigate their aseismic performance. All of the specimens were tested under cyclic-reserve loading to verify and validate the effect of the retrofitted method with prestressed steel strips. The influence of steel strips space in the retrofitted joint core region and in the adjacent region, and of reinforcement layout on the aseismic performance of strengthened joints were studied. The final failure mode, hysteretic behavior, energy dissipation capacity, and ductility of specimens were analyzed by the experiment study. It is found that the specimens strengthened with prestressed steel strips behaved higher shear resistance because the prestressed steel strips effectively restrain the development of cracks in the joint core area and reduce the shear deformation of the joint core area. As a result, the failure mode of specimens changed from the combination of flexural failure of beams and shear failure of joints to the flexural failure of beams. The aseismic performance index of specimens such as bearing capacity,energy dissipation capacity, ductility and stiffness degradation have improved greatly.

Key words: prestressed steel strips, beam-to-column joints, retrofitting, aseismic performance, experimental study

中图分类号: 

  • TU375.4
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