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

Empirical studies have demonstrated a significant interaction between nonlinear flexural and shear responses in reinforced concrete shear walls. This paper investigates the implications of shear-flexural interaction (SFI) on the seismic performance of high-rise reinforced concrete dual frame-wall systems. Structures with three different heights (۲۰, ۲۵ and ۳۰ stories) are analyzed. Comparative structural analyses are conducted using two modeling approaches for shear walls: one incorporating SFI and the other neglecting it. A set of ground motion records from the Federal Emergency Management Agency (FEMA) P۶۹۵ is utilized to perform incremental dynamic analysis, facilitating a detailed evaluation of structural behavior under seismic loading. Collapse risk assessment encompasses seismic hazard analysis and the determination of collapse fragility. Furthermore, the collapse performance is appraised following the FEMA P۶۹۵ methodology. The results underscore the substantial impact of SFI on both seismic performance and collapse risk in high-rise reinforced concrete structures. Specifically, integrating SFI into shear wall modeling results in elevated collapse risk and diminished ACMR. This underscores the pivotal role of SFI in shaping structural resilience.

Keywords:

Shear–Flexure Interaction , Concrete Shear Walls , Seismic Collapse Analysis , FEMA P۶۹۵ , OpenSees