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Floor acceleration control of super‐tall buildings with vibration reduction substructures
Author(s) -
Zhang Lei,
Lu Xinzheng,
Guan Hong,
Xie Linlin,
Lu Xiao
Publication year - 2017
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.1343
Subject(s) - acceleration , reduction (mathematics) , vibration , structural engineering , engineering , parametric statistics , substructure , vibration control , acceleration time , spectral acceleration , beam (structure) , peak ground acceleration , ground motion , mathematics , acoustics , statistics , physics , geometry , classical mechanics
Summary When a super‐tall building is subjected to service level earthquakes (SLEs) or design basis earthquakes (DBEs), its excessive floor acceleration due to the acceleration amplification effect can lead to unacceptable economic loss and functional interruption. This work aims to design the top stories of super‐tall buildings in a form of a vibration reduction substructure (VRS; acting as a giant TMD with a large mass ratio) to control the floor acceleration of the building subjected to SLEs and DBEs. A simplified analytical model for 300 m super‐tall buildings is developed based on the flexural‐shear coupling beam model. Using the simplified model with a VRS on the top of the building, the floor acceleration reduction effect of the VRS is studied through time history analysis under actual ground motions. The optimal frequency of the VRS to reduce the floor acceleration is determined through parametric discussion, and the feasibility of using the VRS for different layouts of super‐tall buildings is validated. The outcome of this study is expected to provide some references for engineering design to mitigate vibration of super‐tall buildings.