Abstract
A method was proposed to improve the measuring precision when using vibration method to measure the short hanger tension.The method identifies the tension,flexural rigidity and damper stiffness simultaneously by combining additional mass method and genetic algorithm.The natural frequency can be changed by adding mass block to different heights of the short hanger.Thus several more identification conditions can be obtained.Not less than four identification conditions should be established in order to identify four parameters,containing hanger tension,flexural rigidity and the damper stiffness at both ends of the hanger.The inverse calculation of the transcendental equations is quite complex.The problem is simplified to a work of minimal optimization.The unknown parameters are identified by the genetic algorithm finally.The identification accuracy was testified by numerical simulation and field measurement.The result evidences that the proposed method can identify the tension,flexural rigidity and damper stiffness simultaneously.The errors of tension are no more than 1% in numerical simulation and 7% in field measurement.The method can be considered as reference in measuring the hanger tension of arch bridges with dampers.
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