Method for precisely testing external prestressing tendon tensioning force
A technology of external prestressing and testing methods, which is applied in the direction of tension measurement, etc., and can solve problems such as difficult to accurately measure the tensile force of external prestressed tendons, the test accuracy cannot meet engineering requirements, and the distance between steering blocks is small.
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[0044] as attached figure 1 , install a vibration pickup on the external prestressed tendon between the two steering gears with a distance of L, connect the vibration pickup to the vibration tester, and measure the first-order vibration angular frequency ω of the external prestressed tendon 1 ; as attached figure 2 , at the middle position L / 2 of the external prestressed tendon, install an additional mass block (magnetic iron block), the installation method is as follows Figure 5 , use the vibration tester to test the first-order vibration angular frequency ω of the external prestressed tendon after adding the mass block 1 ′; combined with the stiffness EI of the external prestressed tendons provided by the design drawings, the material density ρ and the cross-sectional area A, and the measured weight M of the mass block, the tension value T of the external prestressed tendons is calculated using formula (8) 0 .
[0045] T 0 ...
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