RC桥墩的FRP延性加固设计方法研究

复合材料科学与工程 ›› 2015, Vol. 0 ›› Issue (12): 48-52.

RC桥墩的FRP延性加固设计方法研究

董振华^1,2,3, 王克海¹, 刁波^2*

1.交通运输部公路科学研究院交通公路工程研究中心,北京 100088;
2.北京航空航天大学交通科学与工程学院,北京 100191;
3.北京工业大学城市与工程安全减灾教育部重点实验室,北京 100124

收稿日期:2015-07-22 出版日期:2015-12-28 发布日期:2021-09-14
通讯作者: 刁波(1958-),女,教授,博士,主要从事混凝土结构非线性分析及耐久性研究。
作者简介:董振华(1984-),女,博士,主要从事桥梁抗震/桥梁抗震加固方面的研究。
基金资助:
国家自然科学基金(51278020)

STUDIES ON DUCTILITY RETROFITTING DESIGN METHOD FOR RC BRIDGE PIERS WITH FIBER REINFORCED POLYMER COMPOSITE MATERIAL

DONG Zhen-hua^1,2,3, WANG Ke-hai¹, DIAO Bo^2*

1. Highway Engineering Research Center, Research Institute of Highway Ministry of Transport, Beijing 100088, China;
2. College of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
3. Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

Received:2015-07-22 Online:2015-12-28 Published:2021-09-14

摘要/Abstract

摘要： 为了制定经济合理的钢筋混凝土(RC)墩柱的纤维增强复合材料(FRP)抗震延性快速加固方案,提出了基于目标位移延性系数提高指标的FRP抗震延性加固设计方法,并建立了加固墩柱宏观力学性能参数(位移、延性系数)与材料性能参数(FRP约束混凝土极限压应变、FRP配箍率、FRP有效极限抗拉强度、FRP有效极限拉应变)之间的力学计算模型。进一步应用所提出的计算模型,结合有限元数值模拟技术,得到FRP约束圆形和矩形墩柱受力性能的分析结果,并与试验结果进行对比。结果表明,提出的FRP延性加固设计方法可较正确地计算加固RC墩柱的受力性能、FRP片材配箍率或加固厚度,并验证了考虑箍筋和FRP共同约束作用的Seible FRP约束混凝土极限压应变计算模型的合理性。

关键词: 桥梁工程, 延性加固, 目标位移延性系数, 纤维增强复合材料, 桥墩

Abstract: In the present retrofit code for the bridge, the calculation method for FRP jacketing ratio is only presented for RC bridge piers and lack of the complete ductility retrofitting design method. So, the behavior and rational seismic retrofitting plans for FRP-confined RC bridge piers has uncertainty. In order to quickly determine the economical and rational seismic retrofitting plans for reinforced concrete (RC) columns with fiber reinforced polymer (FRP) composite material, a new ductility retrofitting design method was proposed based on the target displacement ductility coefficient. In the proposed ductility retrofitting method, the relationships of macro mechanical properties of FRP strengthened bridge piers, such as displacement and ductility, was built with materials performance parameters of the ultimate compressive strain of FRP-confined concrete, the thickness of FRP jacketing, the effective ultimate tension stress and strain of FRP sheets. The proposed retrofitting design method was further used to estimate the behaviors of FRP confined RC bridge piers with rectangular and circle section, and the finite numerical simulation was applied. Among numerical analysis for the RC bridge piers, two calculation models of the ultimate compressive strain for FRP-confined concrete were selected, in which the Seible's ultimate compressive strain model can consider the complex confinement effect provided by stirrup and FRP jacketing. Based on Mander's tie reinforcements confined concrete model, the behavior of FRP retrofitted specimens was obtained, and it was compared with experimental results. The comparison results show that the proposed ductility retrofitting method can correctly estimate FRP jacketing ratio, FRP sheets thickness and the behaviors of specimens. Furthermore, the Seible's ultimate compressive strain model is verified to be applicable. The proposed ductility retrofitting design method is simple. However, it is only applicable to estimate the performance of FRP confined RC bridge piers with axial compressive ratio less than 0.2 at bending failure mode.

Key words: bridge engineering, ductility retrofitting, target displacement ductility coefficient, fiber reinforced polymer composite material, bridge pier

中图分类号:

TB332
U443.2

董振华, 王克海, 刁波. RC桥墩的FRP延性加固设计方法研究[J]. 复合材料科学与工程, 2015, 0(12): 48-52.

DONG Zhen-hua, WANG Ke-hai, DIAO Bo. STUDIES ON DUCTILITY RETROFITTING DESIGN METHOD FOR RC BRIDGE PIERS WITH FIBER REINFORCED POLYMER COMPOSITE MATERIAL[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(12): 48-52.

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