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| Dynamic characteristics of serial system of bearing with column |
| DU Yong-feng , LIN Zhi-dan ，Li Hui |
| 1. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou Univ. of Tech , Lanzhou.730050,China;2.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou Univ. of Tech , Lanzhou 730050,China |
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Abstract According to the serial system of bearing with column, the natural frequency of serial system is investigated, and the effects of axial load and different rubber bearings are discussed. Taking into account the effects of the cross-section rotation, shear distortion and compression axial force, the mathematical model for free vibration of the system is established. The differential quadrature element method is employed for the discrete processing in governing equations and boundary conditions. The natural frequency of serial system with clamped-free boundary conditions is solved numerically, and the figures of natural frequency with compression axial force are presented. It is shown that the axial force will reduce the lower order natural frequencies significantly, and in certain case of total height, the equivalent bending stiffness of rubber bearings reduces the natural frequencies to different extent.
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Received: 20 December 2011
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2012, Vol. 31 
