The Behavior of Core Wall in Tall Buildings Capable of Two Hinges

Abstract

Tall buildings with Cor wall are growing in the structural industry. Generally, occurring one plastic hinge in the base of the structure is acceptable. In this research,20, 30 and 40 story buildings are designed according to the practice and response spectrum analysis. Then, the base of the structures are modeled by inelastic elements and seven earthquake records are applied to the models.The results show that the moment demands around the mid-height of the reinforced concrete core walls are more than expected values.This matter result in more reinforcement than the amount required from respons spectrum analysis.Another approach is to use another plastic hinge in the mid-height of the core wall.Nonlinear time history analysis of the model with capability of two plastic hinge shows that the moment demand will decrease more than 30 percent for the studied buildings.A third approach is the extended plasticity in which the core wall can have plasticity in anywhere along the height of the core wall. The results show that the interstory drift of such models is not satisfactory. The behavior of the wall will be studied in each approach.

Keywords

• reinforced concrete
• plastic hinge
• tall building