Abstract
To create a partial rocking mode in a building structure during an earthquake, two or more rigid cores with joint connection to the foundation, and capable of moving in the two main directions of the building’s plan, can be used. A rigid core with a hinge connection to the foundation is essentially unstable. However, two rigid cores can be connected together by springs and dampers in certain floors to create a stable structure. At the same time, the structure shows a rocking behavior in which the building moves almost as a rigid body. In fact, the effects of all modes other than the fundamental one is almost eliminated. The use of yielding or friction dampers leads to permanent displacements in the structure in an earthquake. Therefore, in this study pre-compressed springs were employed, which do not create any permanent displacement. The pre-compressed springs were used to provide the structure with initial stiffness and prevent any displacement by small forces. Since an elastic spring does not have any damping, it was decided to control the structural displacements by viscous dampers in certain floors. Finally, the proposed structure underwent static and time-history analyses in plastic range, and the results suggested the desirable behavior of the proposed structure. In particular, there were no permanent displacements left in the structure after the earthquake.
Highlights
Housner was the first researcher who worked on rocking motion of buildings’ foundations [1]
Hosseini and colleagues introduced a kind of seesaw building with friction dampers in columns at the lowest story [13], and Khalkhali and colleagues studied partitioned rocking buildings [14], and Hosseini and Nejati worked design of repairable regular steel buildings with square plan based on seesaw motion of building structure and using double ADAS (DADAS) dampers [15]
The results suggested that the pre-compressed springs slipped almost simultaneously in all floors
Summary
Housner was the first researcher who worked on rocking motion of buildings’ foundations [1]. Hosseini and colleagues introduced a kind of seesaw building with friction dampers in columns at the lowest story [13], and Khalkhali and colleagues studied partitioned rocking buildings [14], and Hosseini and Nejati worked design of repairable regular steel buildings with square plan based on seesaw motion of building structure and using double ADAS (DADAS) dampers [15]. It is crucial to design a structure capable of transitioning into the plastic range during an JOURNAL OF VIBROENGINEERING. It is nearly impossible to understand the plastic behavior of a structure with n degrees of freedom, because earthquake is a random event. A new plastic behavior is proposed for a structure with n degrees of freedom within the plastic range accurately converting it into a structure with one degree of freedom
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