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| Forced Vibration Calculation of the Eccentric Stepped Beam-Foundation System |
| WANG Jian1, 2 ZHANG Zhen-guo1, 2 REN Long-long1, 2 HUA Hong-xing1, 2 |
1. Institute of Vibration, Shock and Noise, Shanghai Jiao Tong University, Shanghai 200240;
2. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240 |
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Abstract The vibrations in vertical and longitudinal directions will couple if mass eccentricities are considered in the beam, a theoretical/experimental method focus on the vibration of eccentric stepped beam-complicated flexible foundation system is proposed combining the receptance coupling and modified transfer matrix method. The method is validated via the comparison to the results obtained by the FEM. The influence on the response of the system caused by eccentricity is investigated. Eccentricity can hardly affect the vertical response of the system, while it can induce displacement in longitudinal direction even the beam is under vertical excitation. The longitudinal vibration is introduced by the form of eθ, therefore, the associated longitudinal displacement is proportional to eccentricity and its characteristic frequencies are consistent with that of the vertical displacement.
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Received: 13 June 2016
Published: 15 November 2017
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