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RISS 인기검색어
- 검색키워드
- 저자 : Xiaoxia Zhen (검색결과 3 건)
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Effect of bending stiffness on the in-plane free vibration characteristics of a cable network
Wei Chen,Zhuojie Zhang,Xiaoxia Zhen,Mingyang Li 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
Stay cables of cable-stayed bridges are connected by cross-ties to form a cable network, or the slings of the same suspension points on a suspension bridge are connected by vibration absorbers to form a sling network. As a result, the cable network’s in-plane free vibration characteristics are different from independent, single cables. However, stay cables or slings have certain bending stiffnesses, which directly affect the cable network’s free vibration characteristics. Therefore, to clarify the real dynamic behavior of a cable network and to improve the accuracy of cable network measurements, a multi-node, cross-tied, multilayer beam analytical model that considers the bending stiffness is proposed. The system equilibrium equation is established and the free vibration frequencies and modes of the system are obtained by analytical algorithm. Then, numerical simulations and field experiments, are carried out to verify the analytical results. In addition, parameter analyses with different configurations are performed on a multilayer stay-cable network and on a double-layer sling network to study the influence of bending stiffness on the cable network’s free vibration characteristics with different parameters.
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Hysteretic behavior of multi-layered beams with Coulomb friction interface law
Yonglin Zhao,Ronghui Wang,Zhuojie Zhang,Xiaoxia Zhen,Lu Wang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
This paper presents a novel recursive algorithm to investigate the slip process of multi-layered laminated beams with Coulomb friction interface law under Euler-Bernoulli beam assumption. Based on the incremental superposition method, the periodic mechanical behavior of a cantilever multi-layered beam under quasi-static reciprocating loading is presented. Particularly, the force-deformation hysteresis loop of the beam is drawn to investigate the changing process of its stiffness. The changing process of the potential energy and the frictional energy dissipation of the beam is calculated analytically, then the results suggest that multi-layered beams with Coulomb friction interface law exhibit both energy dissipation capacity and energy storage property. A numerical example employing zero-thickness nonlinear spring elements which can satisfy the Coulomb friction interface law is implemented and its accuracy is verified against the analytical solution by increasing the density of the zero-thickness elements.
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3D implementation of push-out test in ABAQUS using the phase-field method
Xianbin Yu,Ronghui Wang,Chunguang Dong,Jianyi Ji,Xiaoxia Zhen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
The phase-field method (PFM) localizes the damaged and broken material in concrete with a phase-field order parameter d, successfully avoiding the description of nonsmooth crack surfaces, as well as the pre-setting and tracking of complex crack extension paths. However, most works have focused on 2D and simple 3D problems of non-reinforced concrete due to the high computational cost. A 3D PFM is implemented in the commercial finite element code ABAQUS to model damage and quasi-brittle fractures in composite beam concretes. The damage problem is implemented in the user subroutines UMAT and HETVAL on account of the similarity between the evolution law of the order parameter and the heat transfer law. In addition, a FORTRAN file is used to define the relationships among the material properties. Through this approach, modeling, computational task submission, and post-processing are completed in the GUI of ABAQUS, and the internal nonlinear algorithms are adopted directly. The accuracy of the modeling method is verified by comparing with two classical experimental data in the literature, and the maximum load data and load-displacement curve are well fitted. Moreover, a 3D numerical model for the push-out test of the composite beam is developed. Simulation results are consistent with the test results, such as the trend of the loaddisplacement curve, the damage pattern of the concrete, and the stress condition of the shear bolts. The parametric analysis shows that the compressive and tensile strengths of the shear bonds can significantly affect the load bearing capacity of composite beams, whereas the material parameters of concrete have a limited influence, consistent with the previous experience. The PFM has proven its ability to handle complex quasi-brittle fracture of concrete, and the present work can provide a reference for modeling concrete cracks in engineering structures.
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