| 摘要 |
FIELD: the invention refers to testing technique and may be used for evaluation of technical state of construction structures namely of the resource of an automobile bridge. ^ SUBSTANCE: the evaluation of the residual resource of an automobile bridge is carried out along the parameters of experimental amplitude-frequency characteristics under the influence of loading, the measurements are carried out in two stages with intervals between them of no less then 0,05 of the projected resource of the bridge. At that the current values of speed or accelerations in extreme angular dots of the upper plate of a girth rail of the bridge under the influence of a moving pack of transport vehicles out of no less then 5 automobiles each weights 19-20t, with an interval of 10-30m, with the speed of 40, 50, 60 km/h The number integration is carried out. The wave-length transformation is carried out, spectrograms of displacements on all regimes of moving of the pack are received. The speed of changing of the zone of maximal amplitudes are defined for an interval of time Deltat between controlling tests and the residual resource T. ^ EFFECT: decreases labor-intensiveness and increases accuracy of definition of the resource of construction structures. ^ 2 dwg |
