Study on a nonlinear mass damper for displacement reduction of a base-isolated structure to seismic excitations
Base-isolated structures are capable of protecting the superstructure by shifting the fundamental natural frequency of the superstructure away from the dominant frequency content of an earthquake.Although significant reduction of energy input into the superstructure induced by ground motions can be obtained,the isolation story undergoes relatively large displacement.To mitigate the displacement demand,soften nonlinear energy sinks(SNESs),a type of passive mass damper,are suggested for a corporate use on baseisolated structures in this study.Models of an eight-story base-isolated structure and the same isolated structure with an SNES attached to the top story are formulated analytically and numerically.The Bonc-Wen model is applied to describe the nonlinear behavior of the isolation story.The SNES and the TMD as a comparison are optimized and investigated when subjected to three specific near-field earthquakes.The study finds that the SNES is able to reduce the maximum displacement of the isolation story as well as confine the residual response within a small range,showing great potential in SNESs to mitigate displacement of base-isolated structures.
Base isolation nonlinear energy sink passive control seismic excitation nearfield earthquake
J.Wang Z.Liu H.Li F.Liu
College of Civil Engineering,Hunan University of Technology,Zhuzhou,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
798-807
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）