Abstract
A typical megaframe structure has a high lateral stiffness and is excellent for high‐rise structures. However, this high stiffness can lead to poor seismic response of a structure. Seismic isolation technology is a mature and cheap vibration control method that is used for vibration reduction in megaframes. This paper introduces a megaframe structure based on substructure combined isolation. The structure consists of two parts. The main body is a megaframe, and the substructure is the subframe with the combined isolation layer arranged at the bottom of the subframe. The seismic performance of this structure system was evaluated by performing shaking table tests of two megaframe model structures. The responses of the deformation, acceleration, and shear of the structure were measured. The dynamic behaviors of the structure with or without the combined isolation layer when exposed to single and bidirectional near‐fault and far‐fault ground motions with different peak values were investigated. The results showed that the combined isolation layer can reduce the bidirectional seismic response of the main frame and subframe. The acceleration, base shear, and displacement responses had similar vibration reduction trends for the two model structures, and the structural responses under bidirectional earthquake were generally greater than that under a single directional earthquake. The near‐fault pulse effect increased the seismic response of the structure. The increase of the predominant period of ground motion also increased the seismic response of the structure.
Highlights
There are hundreds of super high-rise buildings built every year in the world
A constrained optimization procedure for the dynamic analysis of hybrid base isolation systems under earthquake excitation was present by Oliveto et al [9]. e seismic response of isolated structures under bidirectional earthquakes was investigated [10,11,12,13]. e response of isolated structures under near-fault earthquakes has seen significant research in recent years. e disorder and damage of appliances in the operation room under near-fault ground motion and long-period ground motion were recorded during shaking table tests [14]
Since the combined isolation layer is arranged at the joint of the subframe and the main frame. is is different from the isolation layer set at the bottom of the foundation, and the megastructure itself has a longer period
Summary
There are hundreds of super high-rise buildings built every year in the world. Super high-rise buildings can adopt different structural systems. Brunesi et al [1] and Lu et al [2, 3] studied the performance of megaframe structural systems through numerical analysis and shaking table tests. E seismic properties of a hybrid high-rise structure that had two structural systems were studied by shaking table test and numerical analysis [4]. Responses of the isolated building based on a shape-memory-alloy supplemented rubber bearing were evaluated by dynamic time-history analysis under a set of recorded, near-fault, and fault-normal components of ground motions [20]. E efficiency of active control systems in reducing the responses of base-isolated structures with various isolation parameters under near-fault earthquake was investigated [21] Responses of the isolated building based on a shape-memory-alloy supplemented rubber bearing were evaluated by dynamic time-history analysis under a set of recorded, near-fault, and fault-normal components of ground motions [20]. e efficiency of active control systems in reducing the responses of base-isolated structures with various isolation parameters under near-fault earthquake was investigated [21]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
