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首页> 外文会议>6th International conference on advanced composite materials in bridges and structures 2012 >FINITE ELEMENT MODELING OF RC BEAMS STRENGTHENED USING PRESTRESSED NSM-CFRP RODS UNDER QUASI-STATIC CYCLIC LOADING
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FINITE ELEMENT MODELING OF RC BEAMS STRENGTHENED USING PRESTRESSED NSM-CFRP RODS UNDER QUASI-STATIC CYCLIC LOADING

机译：准静态循环荷载下预应力NSM-CFRP筋加固RC梁的有限元建模

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摘要

Finite Element Method (FEM) models of Reinforced Concrete (RC) beams strengthened using non-prestressed and prestressed Near Surface Mounted (NSM) Carbon Fibre Reinforced Polymer (CFRP) rods subjected to cyclic loading were developed and validated against experimental test results. Three beams were modelled; one un-strengthened beam, one beam strengthened using non-prestressed NSM CFRP rod, and one beam strengthened using NSM CFRP rod prestressed to 20% of its ultimate tensile strain, 1.6%, and subjected to three quasi-static cycles. The upper and lower load limits were chosen such that to induce a stress range of 125 MPa, according to the Canadian Highway Bridge Design Code, in the tension steel with an upper stress of 70% of the yield stress of the tension steel. The FEM models were found to be in a good agreement with the experimental test results during the un-cracked and cracked regions up to the upper load limit of the first cycle. However, the stiffness of the unloaded branches of the FEM models was higher than those determined experimentally. Thus, the model was validated and can be used to perform a parametric study considering the different variables in the model.
机译：开发了使用非预应力和预应力近表面安装（NSM）碳纤维增强聚合物（CFRP）杆承受循环载荷的钢筋混凝土梁（RC）的有限元方法（FEM）模型，并针对实验测试结果进行了验证。模拟了三个光束；一根未加强的梁，一根使用非预应力NSM CFRP杆加固的梁，和一根使用NSM CFRP杆预应力至其极限拉伸应变的20％，1.6％的梁，并经受了三个准静态循环。根据加拿大高速公路桥梁设计规范，对载荷的上限和下限进行选择，以使应力范围为125 MPa，其上限应力为拉伸钢屈服应力的70％。在未破裂和破裂的区域直至第一个循环的载荷上限之前，FEM模型与实验测试结果非常吻合。但是，FEM模型的未加载分支的刚度高于实验确定的刚度。因此，该模型经过了验证，可以用于考虑模型中的不同变量进行参数研究。

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