Abstract
This article proposes a simplified method for determining the elastic radius ratio of the multi-storey reinforced concrete building. The elastic radius ratio is the benchmark parameter of the buildings in determining torsional stability during an earthquake. When buildings are torsionally flexible, the torsional component of seismic response amplifies the overall response of the building. Because of the numbers of simplified assumptions such as the adoption of the single-storey model, much of the published articles have a very limited range of application. Quantifying the interaction of different forces in multi-story non-proportional buildings has been the main challenge of these studies. The proposed “shear and bending combination method” solves this by introducing parameters that can determine the relative influence of individual actions. Moreover, the proposed method applies to buildings with all type of structural systems, having asymmetry, and accidental eccentricity. The method is validated through a parametric study consisting of eighty-one building models and using computer analysis. The proposed method and the research findings of this study are useful in determining the torsional stability of the building, in verifying the results of the computer-based analysis, and in optimizing the structural system in the buildings.
Highlights
Iman Hajirasouliha andThe torsional stability of the building is considered significant when designing buildings for seismic actions
The shear and bending combination presented method (SBCM) as introduced in this paper, for the calculation of elastic radius ratio, has been verified by the comparison of the results obtained from the static analysis method (SAM)
This study aims to introduce a fast, simple, and reliable manual calculation method (SBCM) for assessing the torsional stability of the multi-storey building under elastic conditions
Summary
Iman Hajirasouliha andThe torsional stability of the building is considered significant when designing buildings for seismic actions. The magnitude and disposition of the translational stiffness offered by the lateral load resisting system in the building are used as the inherent means for providing torsional resistance In this regard, the reinforced concrete multi-storey buildings are generally provided with moment resisting frame (MRF), cantilever shear walls (SW) or core walls, and the dual or combined system for resisting lateral displacement and torsional rotations. Though the combination of MRF and SW system seems easier, the torsional analysis of such multi-storey building structures is difficult compared to the pure MRF and SW systems due to combined shear and bending responses shown by these buildings under the seismic actions. Moment resisting frame deflects predominantly in a shear mode and shear walls deflect predominantly in a bending mode The interaction between these two modes provided by the multi-storey rigid floors/slabs creates non-uniform interacting forces between these two systems [1].
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