COMBINED EFFECT OF SUSTAINED LOAD AND FREEZE/THAW CYCLES ON THE ULTIMATE CAPACITY OF ONE-WAY GFRP REINFORCED CONCRETE SLABS

机译：持续荷载和冻融循环对单向GFRP钢筋混凝土板最大承载力的综合影响

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Flexural behaviour of reinforced concrete slabs has been widely investigated to characterize properties and behaviour of FRP materials as reinforcement for concrete structures. However, the thermal effects at short and long term on FRP bars due to the significant difference between its coefficients of thermal expansion in the transverse and longitudinal directions are still to be evaluated and may affect the bond properties and the concrete cover thickness after multiple exposures to freeze/thaw cycles. This paper presents flexural behaviour of one-way GFRP reinforced concrete slabs which have previously subjected to mechanical load of 20% and 30% of the ultimate flexural capacity of reinforced concrete slabs, simultaneously with freeze/thaw cyclic load. Series tests include FRP-reinforced concrete slabs (500 mm-width × 200 mm-thick × 2500 mm-long). The thermal cycles were varied from -30 to +30℃ for 30 cycles. The four-point bending tests were conducted up the failure of the slabs. The results show that the thermo-mechanical load applied before bending tests increase the ultimate load of reinforced concrete slabs.

机译：广泛研究了钢筋混凝土板的抗弯性能，以表征玻璃钢作为混凝土结构增强材料的性能和行为。但是，由于FRP筋的横向和纵向热膨胀系数之间的显着差异，短期和长期对FRP筋的热效应仍有待评估，并且在多次暴露于FRP钢筋后，可能会影响粘结性能和混凝土覆盖层厚度冻结/解冻周期。本文介绍了单向GFRP钢筋混凝土板的抗弯性能，该板先前承受的机械载荷为钢筋混凝土板极限抗弯能力的20％和30％，同时具有冻融循环荷载。系列测试包括FRP增强混凝土板（宽500毫米×厚200毫米×2500毫米长）。热循环从-30℃变化到+ 30℃，持续30个循环。对板的破坏进行了四点弯曲测试。结果表明，弯曲试验前施加的热机械载荷增加了钢筋混凝土板的极限载荷。

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《6th International conference on advanced composite materials in bridges and structures 2012》|2012年|77-84|共8页
会议地点 Kingston(CA)
作者
H. Bellakehal; R. Massmoudi; A. Zaidi; M. Bouhicha;
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Department of Civil Engineering, University of Sherbrook Sherbrooke, Qc, Canada, J1K2R1;

Department of Civil Engineering, University of Sherbrook Sherbrooke, Qc, Canada, J1K2R1;

Laboratory of Materials and Structure Rehabilitation, University of Laghouat, Laghouat, Algeria;

Laboratory of Materials and Structure Rehabilitation, University of Laghouat, Laghouat, Algeria;

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COMBINED EFFECT OF SUSTAINED LOAD AND FREEZE/THAW CYCLES ON THE ULTIMATE CAPACITY OF ONE-WAY GFRP REINFORCED CONCRETE SLABS

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