Calculationg Research On The Cable Force Considering The Influence Of The Vibration Absorber

The value of the cable force is an important index evaluation in evaluating the operation state of the cable-stayed bridge.The accuracy of the cable force has an important guiding role in the early stages of the cable-stayed bridge construction and later maintenance work.The vibration method based on the string vibration theory is one of the most commonly used methods in the practical detection for the cable force of the cable-stayed bridges.However,the attached dampers will change the value of the cable vibration frequency and the vibration mode.Now using the calculation formula based on the string vibration will generate some errors that can not be ignored.Existing the energy principle,this paper studies the lasso cable force calculation of the inclined cable with two symmetrical arrangement vibration dampers and corrects the cable force calculation formulas.The main work is as follows:(1)This paper simplifies the practical cable model for the needs of the research.Ignoring the sag and the inclination of the cable,a vibration model of the inclined cable is built.(2)The cable force getting from different frequencies is equal.Using the energy principle can get the formula in which there is no the damper stiffness parameter.It is suitable for not too big damper stiffness.(3)A more accurate function is proposed to correct the vibration mode of the cable.The formula derived by the vibration mode function can be applied to the bigger damper.(4)Considering the influence of the additional tension,the paper deduces the corresponding cable force calculation formulas based on the energy principle.(4)Using the ANSYS finite element software,this paper analyzes the modal of the practical cable and the test model.then the principle that use the finite element method to calculate the cable force is analyzed.(5)Using the measurement data of the practical cable and the simulated data of the test model,The last part of the paper verifies the correctness of the formula.The results show that the formulas have a good applicability to calculate the tension of the model and the actual cable.