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Abstract
In this paper, a novel damage detection approach for the spring connection of the double beam system using the dynamic response of the beam and genetic algorithm is presented. The double beam system is regarded as both Bernoulli-Euler beams with simply supported ends, the upper and lower beams are connected by a series of linear springs with certain intervals. With the genetic algorithm, the dynamic acceleration response of double beam system under moving load, which can be solved by the Newmark-β integration procedure, is used as the input data to detect the connection damage. Thus the dynamic response of the double beam system with a certain damage pattern can be calculated employing the moving load model. If the calculated result is quite close to the recorded response of the damaged bridge, this damage pattern will be the solution. The connection damage detection process of the proposed approach is presented herein, and its feasibility is studied from the numerical investigation with simple and multiple damages detection. It is concluded that the sophisticated damage conditions need much longer time to detect successfully.
Highlights
Double beam system is a kind of important beams in civil, and mechanical engineering etc.[1, 2]
For the double beam system vibration, Abu-Hilal studied the dynamic response of a double beam system under a moving constant load, and the dynamic displacements of both beams are given in analytical closed forms [6]
Balkaya et al investigated the free vibration of a double beam system with both end supported and fixed, and the motion of the system is solved by the Differential Transform Method (DTM)[8]
Summary
Double beam system is a kind of important beams in civil, and mechanical engineering etc.[1, 2]. Zhang et al obtained the dynamic responses of an elastically connected supported double-beam system under compressive axial load and arbitrarily distributed continuous loads, where the upper beam and lower beam are continuously joined by a Winkler elastic layer [7]. Koziol adopted wavelet approximation method combined with Adomian’s decomposition to study the dynamic response of a double-beam resting on a nonlinear viscoelastic foundation and subjected to a series of moving loads [10]. A comprehensive investigation on the literatures indicates that most of the existing studies are focused on the dynamic behaviors of double beam system under free vibration and moving loads, and there is no paper investigated the damage detection of the connection between the upper and lower beams for the double beam system.
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