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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars
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Numerical Sensing of Plastic Hinge Regions in Concrete Beams with Hybrid (FRP and Steel) Bars

机译：混合（FRP和钢）钢筋混凝土梁塑性铰区域的数值传感

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摘要

Fibre-reinforced polymer (FRP)-reinforced concrete members exhibit low ductility due to the linear-elastic behaviour of FRP materials. Concrete members reinforced by hybrid FRP–steel bars can improve strength and ductility simultaneously. In this study, the plastic hinge problem of hybrid FRP–steel reinforced concrete beams was numerically assessed through finite element analysis (FEA). Firstly, a finite element model was proposed to validate the numerical method by comparing the simulation results with the test results. Then, three plastic hinge regions—the rebar yielding zone, concrete crushing zone, and curvature localisation zone—of the hybrid reinforced concrete beams were analysed in detail. Finally, the effects of the main parameters, including the beam aspect ratio, concrete grade, steel yield strength, steel reinforcement ratio, steel hardening modulus, and FRP elastic modulus on the lengths of the three plastic zones, were systematically evaluated through parametric studies. It is determined that the hybrid reinforcement ratio exerts a significant effect on the plastic hinge lengths. The larger the hybrid reinforcement ratio, the larger is the extent of the rebar yielding zone and curvature localisation zone. It is also determined that the beam aspect ratio, concrete compressive strength, and steel hardening ratio exert significant positive effects on the length of the rebar yielding zone.
机译：纤维增强聚合物（FRP）增强的混凝土构件由于FRP材料的线弹性行为而具有较低的延展性。复合FRP钢筋加固的混凝土构件可以同时提高强度和延展性。在这项研究中，通过有限元分析（FEA）数值评估了FRP-钢混合混凝土梁的塑性铰问题。首先，通过将仿真结果与测试结果进行比较，提出了一种有限元模型对数值方法进行验证。然后，详细分析了混合钢筋混凝土梁的三个塑性铰区域（钢筋屈服区，混凝土压溃区和曲率局部化区）。最后，通过参数研究系统地评估了主要参数，包括梁的长宽比，混凝土等级，钢筋屈服强度，钢筋增强比，钢筋硬化模量和FRP弹性模量对三个塑性区长度的影响。可以确定，混合增强比对塑料铰链的长度有很大的影响。混合增强比越大，钢筋屈服区和曲率局部化区的范围就越大。还可以确定，梁的纵横比，混凝土的抗压强度和钢的硬化率对钢筋屈服区的长度产生了明显的积极影响。

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