外文翻譯---芳綸纖維筋混凝土梁的抗彎效應(yīng)之?dāng)?shù)值研究-其他專業(yè)(編輯修改稿)
2025-02-24 09:43 本頁面
【文章內(nèi)容簡(jiǎn)介】 im et al. 2021, 2021a。 Yang et al. 2021 . Concrete members prestressed with steel tendons may suffer from corrosion damage, including spalling of concrete and inadequate loadcarrying ca pacity due to reduced steel area, and may require consistent main tenance expenses. The use of noncorrosive FRP tendons can overe such problems. Typically, two types of FRP tendons are available in practice, namely, aramid FRP AFRP and carbon FRP CFRP . Glass FRP may not be remended for prestressed concrete applications because of strength degradation under alka line environments and creep rupture under sustained loads Dolan 1999。 American Concrete Institute ACI 2021 . AFRP tendons provide parable tensile strength to CFRP tendons typically, 1,200 to 2,100 MPa , whereas the former shows a 40% lower modulus, in general, than the latter American Concrete Institute ACI 2021 . The cost of AFRP is about 35% of that of CFRP. Taking into account the high initial costs of FRP applications, AFRP posites may be remended for prestressed concrete members with particular attention to deflection issues because of the low modulus. Contrary to steelprestressed concrete members, FRP prestressed beams do not exhibit yield characteristics because of the linear behavior of FRPs until failure takes place. The low modulus of FRP posites when pared to that of steel may cause large deflections of FRPprestressed beams. Correspond ingly, the majority of existing literature is concerned with these two unique aspects of FRPprestressed members loaded in flex ure. McKay 1992 examined the potential of concrete beams prestressed with AFRP tendons by paring loadcarrying ca pacity of such beams with that of steelprestressed beams. Lees and Burgoyne 1999 studied the effect of bond between concrete and AFRP tendons on the flexural response of AFRPprestressed beams. Toutanji and Saafi 1999 evaluated failure mode and de formability or “ductility” of AFRPprestressed beams, depend ing upon tendon characteristics, and reported that fully bonded tendons caused high ultimate loads with low deformability in parison to unbonded tendons. Grace and AbdelSayed 2021 tested prestressed concrete beams, including a bination of bonded and unbonded CFRP tendons to increase the deformabil ity of the beams. Grace and Singh 2021 presented a design approach for FRPprestressed concrete beams with various types of beam sections and highlighted a method to improve ductility of such beam members by including a bination of bonded and unbonded FRP tendo
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