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Safety factors for CFRP strengthening in bending of reinforced concrete bridges

机译：CFRP加固钢筋混凝土桥梁弯曲的安全系数

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摘要

Concerning the strengthening in bending of reinforced concrete bridge decks, the use of fiber reinforced polymers (FRP) has increased due to its easy application and excellent mechanical and chemical properties. However, due to the lack of codes and standards and the lack of experience in the long term behavior, uncertainties exist in the calculation bases along the dimensioning of this reinforcement and more precisely in the partial coefficients of safety to be adopted for the material properties. As a consequence, bridge engineers are reluctant to use composite materials in the strengthening of damaged reinforced concrete bridge decks. To try to overcome this problem, this paper describes the methodology for a reliability-based calibration of the partial safety factors to be used for the CFRP material in the design of strengthening to bending. The method requires the definition of a response model jointly with the statistical definition of the model error. This is discussed in the first part of the paper. The reliability-based procedure is developed based on the design equation and the corresponding model. A simple set of partial safety factors is finally proposed for a representative population of RC bridges. The conclusions highlight the importance of incorporating the model error in the calibration. In addition, the paper shows how in some cases it is not feasible to design a flexural strengthening by using CFRP. (C) 2015 Elsevier Ltd. All rights reserved.
机译：关于加强钢筋混凝土桥面板的弯曲，由于纤维增强聚合物（FRP）的易用性和优异的机械和化学性能，其使用量有所增加。但是，由于缺乏规范和标准以及缺乏长期行为的经验，计算基础上存在不确定性，具体取决于增强材料的尺寸，更确切地说，材料特性所采用的部分安全系数。结果，桥梁工程师不愿使用复合材料来加固受损的钢筋混凝土桥梁桥面。为了试图克服这个问题，本文描述了一种基于可靠性的部分安全系数校准方法，该方法用于CFRP材料在加固到弯曲的设计中。该方法需要定义响应模型以及模型误差的统计定义。本文的第一部分对此进行了讨论。基于设计方程和相应模型，开发了基于可靠性的过程。最后，针对RC桥梁的代表性人群，提出了一组简单的部分安全系数。结论强调了将模型误差纳入校准的重要性。此外，本文还说明了在某些情况下使用CFRP设计抗弯加固是不可行的。 （C）2015 Elsevier Ltd.保留所有权利。

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