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AssigneeSoletanche Freyssinet
InventorsGilles Hovhanessian, Alexandre Chaperon, Erik Mellier
Estimating the term…
The invention relates to a method for determining the fatigue capital of a cable supporting a civil engineering structure, the method including: a measuring step (S1, S2) during which the normal tensile stress in the cable and the bending stress in the cable are measured in a synchronized manner so as to obtain the compound stress in the cable; a counting step (S3) during which a count of the number of stress cycles, depending on the amplitude of the stress, is carried out from the measured compound stresses; and a step (S4) of assessing the fatigue capital of the cable during which the fatigue capital of the cable is determined by comparing the count, carried out in the counting step, with a pre-set Wohler curve for the cable.
Method for determining the fatigue capital of a cable supporting a civil engineering structure, wherein the method comprises:
Method according to the preceding claim, wherein measurement of the normal tensile force on the cable is realized directly, for example, by means of a load cell.
Method according to any one of the preceding claims, wherein measurement of the bending force on the cable is directly realized.
Method according to any one of the preceding claims, wherein tensile and/or bending measurements are realized at a frequency on the order of 1 Hz to 1 kHz.
Method according to any of the preceding claims, wherein the measurement step is not realized continuously from the moment of cable installation, and wherein the measured data are used to extrapolate from loads before and after the measurement period.
Method according to any one of the preceding claims, wherein the measurement step is realized continuously from the time of cable installation so as to measure the tensile and bending forces on the cable from the time of its installation.
Method according to any one of the preceding claims, wherein the counting step is realized by means of rainflow counting.
Method according to any one of the preceding claims, wherein the history or extrapolation of past loads is used to compare the fatigue actually experienced by the cable with the assumptions made at the time of construction.
Method according to any one of the preceding claims, wherein extrapolations of future loads are used to estimate a capacity or residual lifetime of the cable with respect to fatigue.
Device for determining the fatigue capital of a cable (2) supporting a civil engineering structure (1), wherein the device comprises means for implementing a method according to any one of the preceding claims, that is, comprising:
Device according to the preceding claim, further comprising alert means (16) for automatic notification whenever the cable's capacity or its residual lifespan is reduced below a predetermined threshold.
Dependencies are inferred from the claim text.