Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 3, Number 2, June 2016, pages 175-194
Multi-dimensional seismic response control of offshore platform structures with viscoelastic dampers (II-Experimental study)
Xiao-Yu He, Tie-Wei Zhao, Hong-Nan Li and Jun Zhang

Abstract     [Full Text]
    Based on the change of traditional viscoelastic damper structure, a brand-new damper is designed to control simultaneously the translational vibration and the rotational vibration for platforms. Experimental study has been carried out on the mechanical properties of viscoelastic material and on its multi-dimensional seismic response control effect of viscoelastic damper. Three types of viscoelastic dampers with different shapes of viscoelastic material are designed to test the influence of excited frequency, strain amplitude and ambient temperature on the mechanical property parameters such as circular dissipation per unit, equivalent stiffness, loss factor and storage shear modulus. Then, shaking table tests are done on a group of single-storey platform systems containing one symmetric platform and three asymmetric platforms with different eccentric forms. Experimental results show that the simulation precision of the restoring force model is rather good for the shear deformation of viscoelastic damper and is also satisfied for the torsion deformation and combined deformations of viscoelastic damper. The shaking table tests have verified that the new-type viscoelastic damper is capable of mitigating the multi-dimensional seismic response of offshore platform.
Key Words
    viscoelastic damper; platform; multi-dimensional seismic response; seismic control
Xiao-Yu He: Zhejiang Provincial Planning, Design & Research Institute of Communications, Hangzhou 310006, P.R. China
Tie-Wei Zhao: Ningbo Port and Waterway Administration, Ningbo, 315041, P.R. China
Hong-Nan Li: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Ganjingzi District, Linggong Road 2, Dalian, 116024, P.R. China
Jun Zhang: State Grid Zhejiang Electric Power Company, Hangzhou, 310007, P.R. China

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