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| Nonlinear random vibration analysis of energy-dissipation structures with viscous dampers by random simulation method based on explicit time-domain dimension-reduced iteration scheme |
| Received:May 17, 2016 Revised:June 17, 2016 |
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| DOI：10.7511/jslx201604021 |
| KeyWord:energy-dissipation structure viscous damper suspension bridge nonlinear random vibration explicit time-domain dimension-reduced iteration random simulation method |
| Author | Institution |
| 苏成 |
华南理工大学 土木与交通学院, 广州 ;华南理工大学 亚热带建筑科学国家重点实验室, 广州 |
| 李保木 |
华南理工大学 土木与交通学院, 广州 |
| 陈太聪 |
华南理工大学 土木与交通学院, 广州 ;华南理工大学 亚热带建筑科学国家重点实验室, 广州 |
| 梁雄 |
华南理工大学 土木与交通学院, 广州 ;华南理工大学 亚热带建筑科学国家重点实验室, 广州 |
| 代希华 |
广东省公路建设有限公司, 广州 |
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| Abstract: |
| Viscous dampers are widely used in the design of large-scale complex energy-dissipation structures.Due to their intrinsic nonlinear behavior of damping forces,the nonstationary seismic analysis of a structure with viscous dampers is fundementally a random vibration problem with local nonlinearities.With the advantage of dimension-reduced representation of the time-domain explicit expressions for dynamic responses of an energy-dissipation structure,only those local degrees of freedom related to viscous dampers are required for nonlinear iterative computation.A random simulation method based on explicit time-domain dimension-reduced iteration scheme is then proposed to solve random vibration problems with local nonlinearities.The present approach can serve as a high-efficiency random vibration method for nonlinear seismic analysis of large-scale complex structures with viscous dampers.A nonli-near random vibration analysis is carried out under random seismic excitations of level E2 for a suspension bridge with a main span of 1200m equipped with 4 viscous dampers.Numerical results show that the longitudinal displacement of the main girder of the bridge is greatly reduced at a ratio of 80% due to the installation of viscous dampers,and the internal forces at critical sections of the bridge are decreased by about 5% as well. |