2. The beam size variations and
is the distance between the two dimensions, dimension measuring beam thus involves accurate measurement of the distance between points girder. Object size is measured by the size measurement result of comparison with the standard value, or the difference between the left and right sides of the beam by comparing, in order to know the extent of the damage girder. By understanding dimensional measurement results can be deformed condition of the beam, which is very important to take effective measures to repair the beam. For the deformation of girder is usually first analyzed separately for each size of the resulting measurement, which is then used as a square four-point analysis.
(1) vertical bending (FIG. 23)
23
When such deformation occurs, with the height of the girder a large standard deviation value appears. Vertical bending stress concentration so that the length shortened, the diagonal dimension of the beam will change.
(2) lateral bending (FIG. 24)
24
When such deformation occurs, and diagonal block generating portion will change shape, this time using the central regulation can be more readily determined by the damage. Although the angle-dependent beam deformation conditions and the degree of impact of the impact, but such modification does not significantly affect the length and width of the beam.
(3) an axial compression deformation (FIG. 25)
25
When such deformation occurs, the length of the girder It will change significantly. If the girder while being perpendicular or transverse forces, its height, width, and diagonal equal size will change. (Continued)
(Qiu Lin)