Floor acceleration control of super‐tall buildings with vibration reduction substructures

Abstract

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.

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Seismic performance and response control of large‐scale and special structures

“…Zhang et al designed the top stories of super‐tall buildings in a form of vibration reduction substructure to control the floor acceleration of the building subjected to service level earthquakes and design basis earthquakes. A simplified analytical model for 300‐m super‐tall buildings was developed based on the flexural‐shear coupling beam model.…”