Quasi-Plane-Hypothesis of Strain Coordination for RC Beam Strengthened with Near-Surface Mounted Carbon Fiber Reinforced Plastic Bar or Helical Rib Bar
Rehabilitation of existing structures with fiber reinforced plastics (FRP) has been growing in popularity because they offer superior performance in terms of resistance to corrosion and high stiffness-to-weight ratio. This paper presents strain coordination results of (two groups)6 reinforced concrete beams strengthened with different methods including near-surface mounted CFRP bar and helical rib rebar in order to investigate the strain coordination of CFRP bar or HR bar and steel rebar of RC beam. Because there is relative slipping between RC beam and bar, the strain of CFRP or HR bar and steel rebar of RC beam satisfies the quasi-plane-hypothesis, that is, the strain of longitudinal fiber that parallels to the neutral axis of plated beam within the scope of effective height (h0) of the cross section is in direct proportion to the distance from the fiber to the neutral axis, the strain of CFRP or HR and steel rebar satisfies the equation: εCH=βεsteel , the value of β is equal to 1.0～1.2 according to the test results.
Chaohe Chen, Yong Huang and Guangfan Li
X. T. Zeng and Z. H. Ren, "Quasi-Plane-Hypothesis of Strain Coordination for RC Beam Strengthened with Near-Surface Mounted Carbon Fiber Reinforced Plastic Bar or Helical Rib Bar", Advanced Materials Research, Vols. 243-249, pp. 541-545, 2011