Core area stress determination of FRP confined short concrete columns under axial load by sensor

A new method for the stress determination of short concrete columns under axial load by using cement-based piezoelectric ceramic sensors was proposed. The piezoelectric sensors were embedded into the core area of concrete rectangular short columns. Axial dynamic fatigue load of short concrete columns before and after the confine of fiber reinforced polymer was determinated. The numerical model between output signals of sensors and core area stress of short concrete concretes was established, and the calculated theoretical stress values were contrasted with the stress values derived by model. The results show that the stress values derived by model tallies with the calculated theoretical stress values basically. Then the feasibility of this new method, which the stress of short concrete columns under dynamic load effect is measured by piezoelectric sensors, is verified.