Nonlinear pushover analysis of short-column effects induced by different clerestory opening positions in reinforced concrete frames
The incorporation of clerestory openings in masonry-infilled reinforced concrete (RC) frames is ubiquitous in architectural design for natural ventilation and illumination, but improper design can induce pronounced stiffness irregularities and trigger short column-induced localized damage. This study investigates the sensitivity of the nonlinear seismic performance of masonry-infilled RC frames to the transverse positioning of clerestory openings. Utilizing displacement-controlled nonlinear pushover analysis, four different clerestory opening designs of a one-bay RC frame are evaluated. Plastic-hinge mechanics are defined using the acceptance criteria specified in Seismic Evaluation and Retrofit of Existing Buildings (41-13) (ASCE/SEI 41-13), while capacity–demand equilibria are quantified using the capacity spectrum procedures of Seismic Evaluation and Retrofit of Concrete Buildings (ATC-40) and Improvement of Nonlinear Static Seismic Analysis Procedures (FEMA 440). The findings in this study establish that isolating the clerestory opening from the bounding vertical elements neutralizes captive-column constraints and mitigates premature global stiffness degradation. Specifically, structural configurations featuring internally offset openings demonstrated a 23.36% enhancement in base shear capacity, a 15.77% amplification in energy dissipation, and a 1.62% extension in peak displacement capacity prior to collapse, relative to column-adjacent designs. Furthermore, kinematic damage confirmed that while all structures exhibited a ductile beam-first yielding mechanism, offsetting the fenestrations delayed the propagation of column plastic hinges to higher lateral drift demands. The excellent computational convergence between the ATC-40 and FEMA 440 performance point evaluations also provides a quantitative mechanical foundation and critical theoretical reference for the structural optimization and seismic design of infilled RC infrastructure.
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