Torsion Mitigation of Existing Asymmetric Structures Using Damper

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TORSIONMITIGATION OF EXISTINGASYMMETRIC STRUCTURES USING DAMPER
M.R. Tabeshpour*a, A. Azadb, A. A. Golafshanic, I. Muallad
aMechanical Engineering Department, Sharif University of Technology, Tehran, Iran
bFaculty of Engineering and Information Technology University of Technology, Sydney,
Australia
cCivil Engineering Department, Sharif University of Technology, Tehran, Iran
dDamptech Ltd., Denmark Technical University, Lyngby, Denmark
Received: 5 September 2011, Accepted: 20 February 2012
ABSTRACT
Many existing buildings are irregular in plan or elevation because of asymmetric placement of
masonry infills. The stiffness of masonry infill is a considerable value relating to that of the
structure. Produced torsion from eccentricity because of infill stiffness leads to extra forces
and deformations in structural members and diaphragms. An appropriate alternative to solve
this problem especially in existing buildings is using dampers. Dampers can enhance
structural performance by reducing seismically induced lateral displacements and by reducing
inelastic behavior of beams and columns. In this paper some simple models are used to show
structural modeling and a conceptual discussion is presented on the numerical results. An
accurate model for masonry infill has been used in structural model. Numerical results show
the efficiency and high performance of added dampers to reduce the torsion effects in the
structural elements.
Keywords: Infill wall; damper; push-over; torsion

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