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Evaluation of Optimised Truss Models for FRP Shear Strengthened RC Beams

机译：FRP抗剪钢筋混凝土梁优化桁架模型评估

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This paper presents the experimental work (1) to investigate the shear behaviour of RC beamsrnstrengthened with externally bonded shallow-angle CFRP laminate strips, and (2) to evaluate thernefficiency of optimised truss model in shear resistance of CFRP strengthened beams. Two test seriesrnwith a/d ratios of 2.16 and 3.70 were conducted. Each series consisted of four RC beams withrndifferent inclination of CFRP strips; namely 90, 45 and 25-degree. The results of the study showedrnthat, depending on a/d ratio, shallow angle of CFRP strips gave much better performance in term ofrnshear strength and deformation behaviour, compared with other conventional strengthening scheme.rnAn optimised truss model, based on the principle of minimum strain energy theorem, wasrndeveloped and used to predict the shear capacity as well as the anticipated failure mode of CFRPrnstrengthened beams. It is shown that the proposed model can predict accurately the test results withrncoefficient of variation (COV) of only 4.14%. Compared to other shear model/method, thernproposed model gave a better representation of the actual stress fields and behaviour.
机译：本文介绍了实验工作（1）研究用外部粘结的浅角CFRP层压板加强的RC梁的抗剪性能，以及（2）评估优化的桁架模型对CFRP加固梁的抗剪效率。进行了两个测试序列，其a / d比为2.16和3.70。每个系列由四个CFRP条带倾角不同的RC梁组成。即90度，45度和25度研究结果表明，与其他常规加固方案相比，根据a / d比，CFRP条的浅角度在抗剪强度和变形性能方面具有更好的性能。rn基于最小应变原理的优化桁架模型能量定理被开发出来，并用于预测CFRP加固梁的抗剪能力以及预期的破坏模式。结果表明，提出的模型可以准确预测测试结果，变异系数（COV）仅为4.14％。与其他剪切模型/方法相比，建议的模型可以更好地表示实际应力场和行为。

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