Parametric study on shear lag effect in super high-rise buildings using framed tube system
Abstract
Together with the rapid economic development of the country, there have been more and more buildings higher than 40 stories, so-called super high-rise buildings (SHRB), built in Vietnam. In the design of such buildings, special attention is always paid on the structural systems for lateral load resistance, in which the framed tube structure is a popular solution in the world but has not been commonly used in Vietnam. This paper introduces the shear lag effect, which is the phenomenon of nonlinear distribution in axial stress among the tube columns due to the difference in shear deformations of the structural system when subjected to lateral loads. A fair number of ten numerical models of reinforced concrete SHRB are analyzed by ETABS software to investigate the effects of the following parameters on the shear lag ratio: (i) building height; (ii) aspect ratio; (iii) column spacing; (iv) spandrel depth; and (v) seismic region. Results of the above parametric study can be used sufficiently in the design for SHRB in Vietnam and are presented in the latter part of the paper.
Keywords: Super high-rise building, framed tube, structure, shear lag, effect.
Received: September 7th, 2017; revised: October 20th, 2017; accepted: November 2nd, 2017
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