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首页> 美国卫生研究院文献>Materials >Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes
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Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes

机译：粘结CFRP胶带改装钢冷成型Sigma梁的实验室和数值分析

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摘要

In this paper, the retrofitting method of thin-walled, cold-formed sigma beams using bonded carbon fibre reinforced polymer (CFRP) tapes is proposed. The effectiveness of the presented strengthening method is investigated by the means of laboratory tests and numerical analysis conducted on simply supported, single-span beams made of 200 × 70 × 2 profile by “Blachy Pruszyński” subjected to a four-point bending scheme. Special attention is paid to the evaluation of possibility to increase the load capacity with simultaneous limitation of beams displacements by appropriate location of CFRP tapes. For this purpose, three beams were reinforced with CFRP tape placed on the inner surface of the upper flange, three with CFRP tape on the inner surface of the web, three beams with reinforcement located on the inner surface of the bottom flange, and two beams were tested as reference beams without reinforcement. CFRP tape with a width of 50 mm and a thickness of 1.2 mm was used as the reinforcement and was bonded to the beams by SikaDur®-30 adhesive. Precise strain measurement was made using electrofusion strain gauges, and displacement measurement was performed using two Aramis coupled devices in combination with the Tritop machine. Numerical models of the considered beams were developed in the Finite Element Method (FEM) program Abaqus®. Experimental and numerical analysis made it possible to obtain a very high agreement of results. Based on the conducted research, it was proved how important is the impact of the applied reinforcement (CFRP tapes) in thin-walled steel structures, with respect to the classic methods of strengthening steel building structures.
机译：本文提出了使用粘合碳纤维增强聚合物（CFRP）胶带的薄壁，冷成型Σ梁的改造方法。通过实验室测试和在简单的单跨度梁上进行的实验室测试和数值分析来研究所提出的强化方法的有效性，由200×70×2轮廓由“BlachyPruszyński”进行了四点弯曲方案。特别注意评估可能性增加负载能力，通过CFRP磁带的适当位置同时限制光束位移。为此目的，用置于上凸缘的内表面上的CFRP胶带加固三个梁，在网的内表面上用CFRP胶带，具有钢筋的三个梁，位于底部法兰的内表面上，以及两个梁被测试为参考光束而无需加强。使用宽度为50mm和厚度为1.2mm的CFRP胶带作为增强件，并通过Sikadur®-30粘合剂粘合到梁上。使用电熔应变仪进行精确的应变测量，并且使用两个芳族耦合器件与氚机组合使用置换测量。 COMED光束的数值模型是在有限元方法（FEM）程序ABAQUS®中的。实验和数值分析使得可以获得非常高的结果一致性。基于进行的研究，证明了在加强钢结构结构的经典方法方面，据证明了应用增强（CFRP磁带）对薄壁钢结构的影响。

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