Test method for measuring active and passive hoop forces in frp - confined concrete columns using piezoelectric membranes
A technology that constrains concrete and piezoelectric films, applied in the field of piezoelectric materials, can solve problems such as inability to install, achieve intuitive measurement results, easy measurement operations, and simple test devices
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[0020] The specific implementation manner of the present invention will be described below in conjunction with the technical scheme of the present invention and the accompanying drawings. Specific steps are as follows:
[0021] (1) The structural column to be tested is a concrete column with a diameter of 150mm and a length of 500mm, and the concrete compressive strength is C30; before the FRP-confined concrete column 1, the thickness is only 28μm, the size is 0.6cm×3cm, and the effective area is 1.2cm 2 , with a dielectric constant of 110×10 -12 The piezoelectric film 5 is pasted on the side wall of the core concrete, and the wire 6 is drawn out from the gap between the FRP fiber filaments at a distance of 2d to 10d from the veneer to output the piezoelectric signal, and d is the diameter of the opening;
[0022] (2) Stretch the FRP through the self-locking prestressing device (including the anchor head 2 of the self-locking prestressing tensioning device, the nut 3 of the ...
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