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<p>High-rise buildings are particularly vulnerable to seismic actions due to their height and dynamic characteristics. Accurate assessment of their performance under various loading directions is essential to improve structural safety in seismic zones. ETABS enables the evaluation of the seismic performance of high-rise symmetrical reinforced concrete buildings through nonlinear static pushover analysis. The analysis of the structure, which had dimensions 24 m × 30 m and reached 105 m in height across 30 storeys, occurred under four different lateral load angles that included 0°, 30°, 60°, and 90°. The lateral loads were applied using an inverted triangular distribution to represent fundamental seismic response patterns realistically. Both force-based (base shear, displacement) and performance-based (Sa, Sd) parameters were extracted for each direction using built-in FEMA 440 tools in ETABS. The research investigated seismic loading direction effects on structural behaviour by studying base shear capacity, monitored top displacement, and overall lateral stiffness. The assessment of demand–capacity relationships used Pushover curves and FEMA 440 equivalent linearization methods for all cases. The symmetrical building design did not prevent structural performance from changing significantly based on lateral load direction. Pushover analysis requires multiple lateral directions for examination because they reveal seismic design vulnerabilities in tall buildings and their performance evaluation results.</p>

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Multi-Angle seismic demand assessment of a 30-Storey reinforced concrete Building using Performance-Based criteria

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Praveen Kumar Nigam,
  • Saleem Akhtar

摘要

High-rise buildings are particularly vulnerable to seismic actions due to their height and dynamic characteristics. Accurate assessment of their performance under various loading directions is essential to improve structural safety in seismic zones. ETABS enables the evaluation of the seismic performance of high-rise symmetrical reinforced concrete buildings through nonlinear static pushover analysis. The analysis of the structure, which had dimensions 24 m × 30 m and reached 105 m in height across 30 storeys, occurred under four different lateral load angles that included 0°, 30°, 60°, and 90°. The lateral loads were applied using an inverted triangular distribution to represent fundamental seismic response patterns realistically. Both force-based (base shear, displacement) and performance-based (Sa, Sd) parameters were extracted for each direction using built-in FEMA 440 tools in ETABS. The research investigated seismic loading direction effects on structural behaviour by studying base shear capacity, monitored top displacement, and overall lateral stiffness. The assessment of demand–capacity relationships used Pushover curves and FEMA 440 equivalent linearization methods for all cases. The symmetrical building design did not prevent structural performance from changing significantly based on lateral load direction. Pushover analysis requires multiple lateral directions for examination because they reveal seismic design vulnerabilities in tall buildings and their performance evaluation results.