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Earthquakes and Structures   Volume 4, Number 6, June 2013, pages 685-710
Equivalent lateral force method for buildings with setback: adequacy in elastic range
Rana Roy and Somen Mahato

Abstract     [Full Text]
    Static torsional provisions employing equivalent lateral force method (ELF) require that the earthquake-induced lateral force at each story be applied at a distance equal to design eccentricity (ed) from a reference resistance centre of the corresponding story. Such code torsional provisions, albeit not explicitly stated, are generally believed to be applicable to the regularly asymmetric buildings. Examined herein is the applicability of such code-torsional provisions to buildings with set-back using rigid as well as flexible diaphragm model. Response of a number of set-back systems computed through ELF with static torsional provisions is compared to that by response spectrum based procedure. Influence of infill wall with a range of opening is also investigated. Results of comprehensive parametric studies suggest that the ELF may, with rational engineering judgment, be used for practical purposes taking some care of the surroundings of the setback for stiff systems in particular.
Key Words
    irregular; torsion; seismic; code-provisions; elastic
Rana Roy : Department of Applied Mechanics, Bengal Engineering and Science University, Shibpur, India
Somen Mahato : Department of Civil Engineering, Bengal Engineering and Science University, Shibpur, India

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