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Flexure of continuous HSC beams with external CFRP tendons: Effects of fibre elastic modulus and steel ratio

机译：带有外部CFRP筋的连续HSC梁的挠曲：纤维弹性模量和钢比的影响

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摘要

The results of a theoretical study on the flexural behaviour of continuous high-strength concrete (HSC) beams prestressed with external fibre reinforced polymer (FRP) tendons are presented. A previously developed numerical model is extended to the analysis of continuous HSC beams with external FRP tendons. A numerical test is conducted on two-span externally prestressed beams made of HSC with compressive strength of 90 MPa. The external tendons are assumed to be carbon FRP (CFRP) composites covering a wide range of modulus of elasticity. Various levels of nonprestressed steel ratio are used. Comprehensive aspects of behaviour of such type of beams are examined. The results show that CFRP with high elastic modulus of 500 GPa mobilizes quite different structural responses compared to those with normal elastic modulus, and that the amount of nonprestressed steel affects remarkably the behaviour of such beams. The study also indicates that some moment redistribution knowledge valid for conventional continuous concrete beams may not be applicable to continuous HSC beams with external FRP tendons.
机译：给出了用外部纤维增强聚合物（FRP）筋预应力的连续高强度混凝土（HSC）梁抗弯性能的理论研究结果。先前开发的数值模型扩展到具有外部FRP筋的连续HSC梁的分析。对由HSC制成的两跨外部预应力梁进行了数值试验，其抗压强度为90 MPa。外部腱被假定为碳FRP（CFRP）复合材料，覆盖广泛的弹性模量。使用各种水平的非预应力钢比率。研究了这类光束行为的综合方面。结果表明，与具有正常弹性模量的CFRP相比，具有500 GPa的高弹性模量具有不同的结构响应，并且非预应力钢的量显着影响了这种梁的性能。研究还表明，对于常规连续混凝土梁有效的矩重分布知识可能不适用于带有外部FRP筋的连续HSC梁。

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