The effect of the arrangement of centers of mass and rigidity in the plan on the collapse performance of low-rise torsionally flexible buildings

Articles in Press

Document Type : Original Article

Authors

1 MSc, Department of Civil Engineering, Azarshahr Branch, Islamic Azad University, Azarshahr, Iran

2 Assistant Professor, Department of Civil Engineering, Azarshahr Branch, Islamic Azad University, Azarshahr,Iran

10.22065/jsce.2024.421352.3242

Abstract

The seismic performance of buildings with high torsional flexibility is less understood compared to torsionally stiff buildings. Sufficient knowledge of the impact of irregularity on the collapse performance is necessary in this category of structures. To this end, 32 different arrangements of mass and stiffness centers are considered in the floors to determine the collapse of these types of buildings due to the torsional irregularity in the floors. The investigation is conducted on low-rise concrete structures designed with asymmetric stiffness distributions. The evaluation of these structural models is performed using the FEMA-P695 guidelines. The collapse mechanisms of the models are compared based on different arrangements of mass centers around the stiffness center in the floors. A color pattern for rotational springs is introduced to identify the level of non-linear behavior in structural members. The classification of collapse mechanisms based on this pattern is carried out using a MATLAB-based processor. The results indicate that the torsional flexibility of structures plays a significant role in their collapse performance. According to the findings, the collapse capacity in torsionally flexible models improves with an increase in eccentricity, and this trend is independent of the arrangement of centers in the studied models. This study has identified key factors in the occurrence of observations.

Keywords

Main Subjects

Journal of Structural and Construction Engineering

Articles in Press, Accepted Manuscript
Available Online from 15 February 2024

Files

History

  • Receive Date: 22 October 2023
  • Revise Date: 18 January 2024
  • Accept Date: 15 February 2024

Share

How to cite

Statistics