中文核心期刊
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中国科技核心期刊
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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2016, Vol. 35 ›› Issue (5): 5-8.DOI: 10.3969/j.issn.1674-0696.2016.05.02

• 桥梁与隧道工程 • 上一篇    下一篇

服役RC梁桥CFRP板加固后的动态可靠度分析

陈强   

  1. （湖南城市学院 土木工程学院，湖南 益阳 413000）
  • 收稿日期:2015-09-09 修回日期:2015-10-23 出版日期:2016-10-20 发布日期:2016-10-31
  • 作者简介:第一作者：陈强（1968—），男，湖南常德人，副教授，硕士，主要从事桥梁结构理论分析方面的研究。E-mail：846039016@qq.com。
  • 基金资助:
    湖南省科技厅科技计划项目（2012GK3066）

Dynamic Reliability Analysis of Serviceability State for RC Beam Bridges Strengthened with CFRP Sheet

CHEN Qiang   

  1. (Shool of Civil Engineering,Hunan City University, Yiyang 413000，Hunan，P.R.China)
  • Received:2015-09-09 Revised:2015-10-23 Online:2016-10-20 Published:2016-10-31

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摘要： 建立起服役（RC）钢筋混凝土梁桥在（CFRP）碳纤维板加固前后正常使用状态下荷载效应的均值和标准差模型；采用模糊当量法将服役RC梁桥在正常使用极限状态的挠度当量转换为在一定区间内的均匀分布函数；在此基础上建立了服役RC梁桥在CFRP板加固后的正常使用极限状态方程。结合某座加固实体工程，采用JC验算点法计算了该桥在正常使用极限状态下，加固完成时及加固后的动态可靠度指标，得到了加固完成时可靠度指标的提高量及加固完成后可靠度指标的变化规律。研究发现:用CFRP板加固现有梁桥后，1号梁仍不能满足正常使用要求，2号梁在加固后服役30年后仍不能满足正常使用要求，说明目前采取碳纤维板加固桥梁在正常使用能力可靠性方面仍有所欠缺。

关键词: 桥梁工程, 服役RC梁桥, CFRP板加固, 模糊当量法, JC验算点法, 动态可靠度

Abstract: The model simulating the mean and standard deviation of load effects for serviceability limit state of RC beam bridge strengthened by CFRP sheets were developed, and then the fuzzy equivalent method was used to convert deflection equivalent under serviceability limit state of bridge in service into equivalent uniform-distribution function in a certain range. On basis of this, the formulation for serviceability limit state of RC beam bridge strengthened with CFRP sheets was formulated. Combined with an actual bridge strengthened with CFRP, the JC checking point method was employed to calculate the dynamic reliability index of serviceability limit state at the completion of reinforcing works and in some time after such strengthening work done. The study findings show that after the bridge being reinforced with CFRP, #1 girder still fails to satisfy the required normal serviceability and #2 girder, and after being reinforced and serving over 30 years still fails to satisfy the required normal serviceability, both of which indicate the defect of the currently applied CFRP in respect of reliability of normal serviceability of bridge strengthened with CFRP.

Key words: bridge engineering;RC beam bridge, CFRP sheet strengthening, fuzzy equivalent method, JC checking point method, dynamic reliability index

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