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Structural Engineering and Mechanics
  Volume 48, Number 2, October25 2013, pages 173-193
DOI: http://dx.doi.org/10.12989/sem.2013.48.2.173
 


Effective number of mega-bracing, in order to minimize shear lag
Rouzbeh Zahiri-Hashemi, Ali Kheyroddin and Basir Farhadi

 
Abstract
    In this paper, influence of geometric configurations of multi-story bracing on shear lag behaviour of braced tube structures is investigated. The shear lag of 24-, 36- and 72-story braced tube structures are assessed considering all possible configurations of overall X and Chevron bracing types. Based on the analytical results, empirical equations, useful for the preliminary design phase, are proposed to provide the optimum number of stories that braced, in order to exert minimum shear lag on structures. Studying the interaction behaviour of a tube and different bracing types along with paying attention to the shear lag behaviour, a better explanation about the reasons behind the efficiency of a specific bracing module in decreasing the shear lag is developed. The analytical results show that there are distinct differences between the anatomy of braced tube structures with X and Chevron bracing regarding the shear lag behaviour.
 
Key Words
    tall buildings; framed tube; braced tube; shear lag; multi-story bracing
 
Address
Rouzbeh Zahiri-Hashemi, Ali Kheyroddin : Department of Civil Engineering, Semnan University, Semnan, Iran
Basir Farhadi : Department of Civil Engineering, Islamic Azad University, Roudehen Branch, Roudehen, Tehran, Iran
 

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