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A machine learning approach to damage detection of bridges
Published in Hiroshi Yokota, Dan M. Frangopol, Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations, 2021
Finite element analysis of the beam is carried out using eight Euler Bernoulli beam elements per span. Vehicle is modeled as a moving load. Rayleigh damping is assumed, with 2% modal damping in the first two modes. Acceleration responses at the vertical DOFs at the nodes are used as sensor data. The true acceleration responses are computed using the Newmark-β method. Eight elements are considered over the span. Figure 3 shows the sensor locations on the bridge.
Dynamic response analysis of multi-span bridge-track structure system under moving loads
Published in Mechanics Based Design of Structures and Machines, 2023
Shaohui Liu, Lizhong Jiang, Wangbao Zhou, Chai Xilin, Yuntai Zhang
For the second case, to verify the applicability of the proposed calculation method in the bridge-track structure multi-layer beam system, the dynamic responses of a three-span high-speed railway simply supported beam bridge-track structure (HSRBTS) under vertical moving load series based on the finite element method are compared with the results of the proposed method. The calculation parameters of the four-layer beam system are shown in Table 2. When v = 288 km/h, Fig. 3 shows the time-history curve comparison of the mid-span vertical deflection dynamic response of the four-layer beam system, showing a good agreement, confirming the applicability of the calculation method in the four-layer beam system. However, compared with the finite element model, the analytical expression can better describe the relationship between each parameter and the dynamic response of the bridge-track structure system, and can greatly shorten the modeling calculation time.
Vibration response of symmetric and sigmoid functionally graded beam rested on elastic foundation under moving point mass
Published in Mechanics Based Design of Structures and Machines, 2023
Ismail Esen, Mohamed A. Eltaher, Alaa A. Abdelrahman
From previous works and literature survey, it is concluded that the dynamic response of sigmoid FG Timoshenko beam under the moving mass with varying velocities and rested on elastic foundation is not be addressed. Therefore, this article aims to fill this gap and study comprehensively the dynamic behavior of sigmoid FG beam under moving load by using finite element method. The next sections will be organized as following: the mathematical model including material gradation, kinematic field, elastic foundations, the forced of moving mass, and equations of motion are presented in detail though Section 2. The numerical formulation including FE stiffness and mass matrices, and force vectors, numerical integration method of Newmark are described in Section 3. In Section 4, the verification and parametric studies including gradation index, gradation function, elastic foundation, mass velocities, and boundary conditions are discussed in Section 4. Conclusion and outcomes are summarized in Section 5.
Nonlinear vibration of thick multi-scale composite doubly curved shells
Published in Mechanics Based Design of Structures and Machines, 2022
Fazelzadeh, Pouresmaeeli, and Ghavanloo (2015) investigated the nonlinear aeroelastic behavior of CNTs reinforcement composite plate. They considered five different distributions of CNTs along the thickness direction. In this study, the effect of CNTs volume fraction, aspect ratio and in-plane forces on flutter dynamic pressure were studied. Malekzadeh, Dehbozorgi, and Monajjemzadeh (2015) used first-shear deformation theory and finite element method to study vibration response of CNTs functionally graded reinforcement composite plates under the effect of a moving load. The effects of symmetric and asymmetric distributions of CNTs on dynamic behavior of the plates were studied. Yas and Samadi (2012) investigated the effects of SWCNTs on free vibration and buckling analysis of Timoshenko beams on elastic foundation. Rafiee, He, and Liew (2014a) studied the nonlinear behavior of SWCNTs reinforced composite plates under different thermal and mechanical load conditions. In this study the piezoelectric layers were bonded on top and bottom surface of the plate. The results indicated that the CNTs volume fraction, piezoelectric layer thickness and applied voltage all can affect the nonlinear response of the reinforced plate. Yazdi (2019) investigated the effect of CNTs on aeroelastic stability of polymer/CNTs/fiber composite plates. In this study, CNTs were distributed into polymer matrix and usual fibers were embedded into enriched matrix. According to the results, a low amount of CNTs can improve 45% flutter pressure of reinforced composite plate in comparison to usual composite plates.