Effects of Torsion on Lateral Stability of Building Structures
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Date
2010-05
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Addis Ababa University
Abstract
Key words: Torsion, Global Lateral Stability, Parametric Study, Eccentricity, Load
Carrying Capacity, Axial Load, Storey Number, Lateral Loading, Gravity Loading.
This paper surveys the effects of torsion on the global lateral stability of a shear wall
building with typical plan and elevation layouts.
In order to achieve the goal of study, a parametric investigation procedure is
undertaken, on a series of sample structures with a condition which can cause torsion
and their lateral stability under earthquake and gravity loading is investigated and
discussed.
To study the effects of torsion on the lateral stability of building structures, three
asymmetric models are constructed by moving the shear-wall couple in the centric
model from grid lines “-X1_X1” to grid lines “X1_ X2” in one model, and to grid lines
“X2_X3” and grid lines “X3_X4” in another models.
In addition the effects of axial loading and increasing storey number on the lateral
stability of building structures are parallely studied on one of the series models.
To study the influence of storey number, three different stories are constructed on the
same series model keeping their inter storey height constant.
Load-displacement diagrams are constructed for the above three conditions and are
shown in Figure 6-1_Figure 6-10.
From the Load-displacement diagrams, global lateral stability “D” is computed.
Reduction in global lateral stability due to the induced asymmetry proved to be
(89%, 97% and 98%) respectively. Furthermore it is shown that the effect of axial
loading is considerable in both the centric and eccentric wall configurations. And the
lateral stability of a structure on the same configuration decreases while increasing
storey number.
Thus depending on the analysis results conclusions and recommendations are made
and some further studies are forecasted.
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Structural Engineering