计算力学学报2016，Vol.33Issue(4)：556-563,8.DOI:10.7511/jslx201604021
粘滞阻尼器减震结构非线性随机振动的时域显式降维迭代随机模拟法
Nonlinear random vibration analysis of energy-dissipation structures with viscous dampers by random simulation method based on explicit time-domain dimension-reduced iteration scheme
摘要
Abstract
Viscous dampers are widely used in the design of large-scale complex energy-dissipation struc-tures.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 suspen-sion 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.关键词
减震结构/粘滞阻尼器/悬索桥/非线性随机振动/时域显式降维迭代/随机模拟Key words
energy-dissipation structure/viscous damper/suspension bridge/nonlinear random vibration/explicit time-domain dimension-reduced iteration/random simulation method分类
数理科学引用本文复制引用
苏成,李保木,陈太聪,梁雄,代希华..粘滞阻尼器减震结构非线性随机振动的时域显式降维迭代随机模拟法[J].计算力学学报,2016,33(4):556-563,8.基金项目
国家自然科学基金(51078150) （51078150）
华南理工大学亚热带建筑科学国家重点实验室(2013ZA01,2015ZC19)资助项目 （2013ZA01,2015ZC19）
