Resilience-based Design Method For Super Tall Mega Column-core Tube-outrigger Buildings Under Maximum Considered Earthquake

Most of the super-tall buildings in China face severe earthquake threat.How to ensure the rapid recovery of super-tall buildings after maximum considered earthquake(MCE)is a critical problem for the urban sustainable development.Resilience-based design method for super tall mega column-core tube-outrigger buildings under MCE is systematically investigated in this work.Three critical issues,including(a)the seismic analysis method of super-tall buildings under MCE,(b)the determination strategy for the stiffnesses of key components in super tall mega column-core tube-outrigger buildings,and(c)the design method for energy dissipation components,are studied in detail.The main research work of this dissertation are summaried as follows:(1)A multi-layered shell element is developed in an open-source software(i.e.OpenSees)to simulate shear walls.A series of traditional RC shear walls and new high-performance RC shear walls with various types of sections are simulated,through which the accuracy and stability of this new element is validated.(2)A seismic analysis method based on the refined finite element(FE)models is proposed to simulate super-tall buildings using OpenSees.Based on this method,the refined FE models of typical super-tall buildings are established,and the seismic responses of these super-tall buildings are evaluated.The simulation results of OpenSees and MSC.Marc are compared with good agreement,validating the reliability and rationality of the the proposed method.(3)The determination strategy for the stiffnesses of key components in super-tall mega column-core tube-outrigger buildings is proposed.Specifically,a quantitative relationship between the maximum elastic drift ratio and the macro design parameters of the flexure-shear model is proposed,through which the macro design parameters can be efficiently obtained according to the specified maximum elastic drift ratio.Then,the inherent correlation between the macro design parameters and the stiffnesses of key components in the fishbone model is established,through which the reasonable stiffnesses of key componets can be efficiently and reliably determined.(4)The seismic energy dissipation principles and energy based design method are recommended for resilient super tall mega column-core tube-outrigger buildings.The vibration reduction efficiency of all energy dissipation components,the contribution ratio of different energy dissipation component,the distribution of plastic energy dissipation by different components and total plastic energy dissipation along the height of super-tall buildings are statistical evaluated.Then,the energy based design method is proposed for energy dissipation components,which may contribute to the resilience-based design of super-tall mega column-core tube-outrigger buildings under MCE.(5)The resilience-based design method for super tall mega column-core tube-outrigger buildings under MCE using energy based method is conclusively proposed.Based on this method,a super tall mega column-core tube-outrigger building with a height of 525 m is preliminarily designed.It's worth mentioning here that the whole design procedure consumes approximately 1 hour.This research outcome provides a useful reference for the resilience-based design of super-tall mega column-core tube-outrigger buildings.