Impact of Shear-Flexural Interaction on the Collapse Vulnerability of Tall Reinforced Concrete Frame-Wall Buildings

In reinforced concrete structures, especially tall buildings, the behavior of shear walls under seismic loading is complex. Traditional analyses often consider flexural and shear responses separately. However, empirical studies have shown that these responses interact in significant ways, affecting the overall performance of the structure during an earthquake.

Key Points
Shear-Flexural Interaction (SFI): This term refers to the combined effect of shear and flexural (bending) stresses in shear walls. Ignoring this interaction can lead to underestimating the vulnerability of structures to collapse during seismic events.

Modeling Approaches: The study involves two modeling approaches for analyzing shear walls: one that includes SFI and another that does not. This comparison helps in understanding the true impact of SFI on structural behavior.

Seismic Performance Analysis: Using ground motion records from FEMA P695, the study performs incremental dynamic analysis on buildings of 20, 25, and 30 stories. This method allows for a detailed evaluation of how structures respond to increasing seismic intensity.

Collapse Risk Assessment: The research includes a thorough assessment of collapse risk by conducting seismic hazard analysis and determining collapse fragility. The FEMA P695 methodology is used to appraise collapse performance, providing a robust framework for evaluating structural resilience.

Findings: The results highlight that incorporating SFI into the modeling of shear walls significantly impacts seismic performance. Specifically, buildings modeled with SFI show a higher collapse risk and lower Adjusted Collapse Margin Ratio (ACMR). This underscores the importance of considering SFI in the design and analysis of high-rise reinforced concrete structures to ensure their resilience during earthquakes.

For those interested in exploring the detailed findings and methodology, I encourage you to download and read the full article via the following link: http://www.jsee.ir/article_713849.html.