Simplified Method of Determining Torsional Stability of the Multi-Storey Reinforced Concrete Buildings

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.

Reliability Assessment of Masonry Infilled RC Frame Building’s Earthquake Performance through Accidental Torsion Consideration

“…Kohiyama & Yokoyama [35] showed that even the most basic assumptions could be further improved by expanding the theory of structural eccentricity and concluding that there is an overlooked phenomenon called the Q-Δ effect (Q represents lateral force), accounting for large displacements. De-la-Colina & Valdés-González [36] continue with this thought process by proposing a design procedure that would not require accidental torsion but an amplification of design parameters, and Khatiwada & Lumantarna [37] propose a simplified method for determining torsional stability. Some research deals with the occurrence of torsion in regular symmetric structures in the nonlinear range [38][39][40][41][42], all pointing to the importance of this occurrence in regular buildings and specific issues regarding the material in question -RC or steel.…”