Upgrading the degree of coupling of coupled shear walls

This paper presents a simple method for upgrading the degree of coupling of coupled shear walls in need of retrofit. The method considers two basic systems: (i) walls linked solely by slabs in which coupling is ineffective, and (ii) walls coupled by beams and (or) slabs in which coupling is insufficient. The method is based on enhancing the stiffness and strength of the coupling system by introducing a limited number of deep coupling beams. The method is cost-effective, since it optimizes the number and location of added coupling beams, which demand special detailing and are very costly. In addition, the method minimizes the reduction of the clearance for the passage of services along corridors, particularly in buildings with low interstorey height. Three cases are treated in this paper corresponding to the retrofit of one, two, and three upgrading coupling beams. Design tools are presented in this paper as easy to use diagrams. Finally, numerical examples demonstrate the applicability of the proposed upgrading method. The paper is thought to be a useful tool for practicing engineers.