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<p>This research undertakes a detailed seismic assessment of reinforced concrete (RC) frame structures incorporating unreinforced masonry (URM) infill walls with varying sizes of openings. The investigation involves the development and analysis of five distinct building configurations modelled using the strut-infill approach in alignment with ASCE 41–06 guidelines. These configurations include a fully infilled frame and four additional models with 12.80, 19.20, 29.60 and 40.00% infill wall openings, respectively. Structural layouts analysed comprise a symmetrical plan and three irregular forms are H-shaped, T-shaped, and Plus-shaped geometries. All models are subjected to seismic loading, and nonlinear static adaptive pushover analysis is performed using SeismoStruct software to capture their seismic response characteristics. The study specifically evaluates key design parameters such as base shear capacity, ductility factor, ductility reduction factor, overstrength factor, response reduction factor and the time period of buildings. The infill panels are modelled using equivalent strut formulations of the masonry infill. Response spectra from the Chi-Chi earthquake are used as seismic input to represent realistic ground motion in the adaptive pushover analysis. Plan irregularity and increased infill wall openings significantly influence the seismic performance parameters by reducing lateral strength and R factor of RC frame structures. Irregular configurations, especially T and Plus-shaped plans, exhibit more pronounced degradation in structural performance as infill discontinuity increases compared to symmetrical plan models.</p>

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Influence of infill wall opening on seismic performance of irregular RC buildings by using adaptive pushover analysis

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Udayraj Janardan Patil,
  • Rohit Rajendra Kurlapkar,
  • Mangeshkumar Rajkumar Shendkar

摘要

This research undertakes a detailed seismic assessment of reinforced concrete (RC) frame structures incorporating unreinforced masonry (URM) infill walls with varying sizes of openings. The investigation involves the development and analysis of five distinct building configurations modelled using the strut-infill approach in alignment with ASCE 41–06 guidelines. These configurations include a fully infilled frame and four additional models with 12.80, 19.20, 29.60 and 40.00% infill wall openings, respectively. Structural layouts analysed comprise a symmetrical plan and three irregular forms are H-shaped, T-shaped, and Plus-shaped geometries. All models are subjected to seismic loading, and nonlinear static adaptive pushover analysis is performed using SeismoStruct software to capture their seismic response characteristics. The study specifically evaluates key design parameters such as base shear capacity, ductility factor, ductility reduction factor, overstrength factor, response reduction factor and the time period of buildings. The infill panels are modelled using equivalent strut formulations of the masonry infill. Response spectra from the Chi-Chi earthquake are used as seismic input to represent realistic ground motion in the adaptive pushover analysis. Plan irregularity and increased infill wall openings significantly influence the seismic performance parameters by reducing lateral strength and R factor of RC frame structures. Irregular configurations, especially T and Plus-shaped plans, exhibit more pronounced degradation in structural performance as infill discontinuity increases compared to symmetrical plan models.