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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >MODELING THE FIRE RESPONSE OF RC BEAMS STRENGTHENED WITH NEAR-SURFACE-MOUNTED FRP REINFORCEMENT
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MODELING THE FIRE RESPONSE OF RC BEAMS STRENGTHENED WITH NEAR-SURFACE-MOUNTED FRP REINFORCEMENT

机译：近表面安装FRP加固的RC梁的火灾响应建模

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摘要

Fire resistance can be a critical issue for FRP strengthened concrete structural members when used in building applications. In this paper, a numerical model for evaluating the fire response of a reinforced concrete (RC) beam strengthened with near-surface-mounted (NSM) FRP reinforcement is presented. The model is based on macroscopic finite element approach and is capable of tracing the response of the beam from pre-loading stage to collapse under a specified fire exposure and loading condition. The model accounts for high temperature properties of constitutive materials, load and restraint conditions, as well as temperature induced bond degradation at the FRP-concrete interface. The validity of the model is established by comparing predictions from the model with data from fire tests. Also, a case study is presented on a set of RC beams, strengthened with NSM FRP rebars, to illustrate the usefulness of the model in evaluating fire response. Results from numerical studies indicate when subjected to same load/capacity ratio, concrete beams strengthened with NSM FRP reinforcement experiences slight reduction in fire resistance as compared to conventional RC beam. It is also shown that an appropriate insulation scheme can significantly increase the fire resistance of RC beams strengthened with NSM FRP reinforcement.
机译：当将FRP增强的混凝土结构构件用于建筑中时，防火性可能是一个关键问题。本文提出了一种数值模型，用于评估采用近表面安装（NSM）FRP增强的钢筋混凝土（RC）梁的火灾响应。该模型基于宏观有限元方法，能够跟踪在特定的火灾暴露和载荷条件下，从预加载阶段到坍塌的光束响应。该模型考虑了本构材料的高温特性，载荷和约束条件，以及温度引起的FRP-混凝土界面处的粘结降解。通过将模型的预测与火灾测试的数据进行比较，可以确定模型的有效性。此外，还对一组用NSM FRP钢筋加固的钢筋混凝土梁进行了案例研究，以说明该模型在评估火灾响应方面的实用性。数值研究结果表明，在相同的荷载/承载比的情况下，与传统的RC梁相比，采用NSM FRP增强的混凝土梁的耐火性略有降低。还显示出适当的保温方案可以显着提高用NSM FRP加固的RC梁的耐火性。

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