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Exploring damping characteristics of composite tower of cable-stayed bridges

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Abstract

The damping characterization is important in making accurate predictions of the seismic response of the hybrid structures dominated by different damping mechanisms. Different damping characteristics arise from the construction of the tower with different materials: steel for the upper part; reinforced concrete for the lower main part and interaction with supporting soil. The process of modeling damping matrices and experimental verification is challenging because damping cannot be determined via static tests as mass and stiffness can be. The assumption of classical damping is not appropriate if the system to be analyzed consists of two or more parts with significantly different levels of damping. The dynamic response of structures is critically determined by the damping mechanisms, and its value is very important for the design and analysis of vibrating structures. An analytical approach that is capable of evaluating the equivalent modal damping ratio from structural components is desirable for improving seismic design. Two approaches are considered to define and investigate dynamic characteristics of a composite tower of cable-stayed bridges: The first approach makes use of a simplified approximation of two lumped masses to investigate the structure irregularity effects including damping of different material, mass ratio, frequency ratio on dynamic characteristics and modal damping. The second approach employs a detailed numerical step-by-step integration procedure.

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  1. Faculty of Engineering, Civil Engineering Department, Taibah University, Madinah, 41411, P.O. 344, Saudia Arabia

    SHEHATA E ABDEL RAHEEM

  2. Faculty of Engineering, Civil Engineering Department, Assiut University, Assiut, 71516, Egypt

    SHEHATA E ABDEL RAHEEM

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ABDEL RAHEEM, S.E. Exploring damping characteristics of composite tower of cable-stayed bridges. Sādhanā 41, 345–358 (2016). https://doi.org/10.1007/s12046-016-0467-x

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