PEELING-OFF PHENOMENON IN FRP STRENGTHENED CONCRETE BEAMS DUE TO THERMAL RESIDUAL STRESS

Peeling-off phenomena in FRP strengthened concrete beams are investigated in this paper. Based on the beam theory and the fracture mechanics, a new theoretical model is proposed to analyze the peeling-off behavior near FRP-concrete interfaces, which is governed by residual thermal stresses. Numerical examples are presented to provide a clear insight into the failure mechanism. Some suggestions are provided for the optimal design of FRP strengthened structures.

两种青核桃脱皮机脱皮性能分析与试验

核桃是我国的传统土特产,种植面积居世界第一。传统的手工脱核桃青皮方法劳动强度大、工作效率低,因此迫切需要适用的机械来进行青皮的剥离。为此,通过分析旋切滚筒式和旋转滚筒—清洗组合式青核桃脱皮机的结构、工作原理以及各自的优缺点,对不同品种的核桃进行脱青皮试验,分析实验数据,揭示影响核桃脱青皮性能的主要因素,为机具的改进提供了理论依据。