Structural Design and Seismic Performance Analysis of a Super-tall Residential Building

To address the seismic safety concerns in super high-rise structures with weakly-connected floor slabs and to establish a referential performance-based seismic design methodology, this study investigates a specific super high-rise structure featuring weakly-connected floor slabs. A component-based performance seismic analysis was carried out under frequent, design-basis, and rare earthquake scenarios, along with a specialized design for the weakly-connected floor system. The results indicate that the overall structural indices meet the required standards. Under strong seismic action, the maximum inter-story drift angle remains below the code limit of 1/120. Energy-dissipating components, such as coupling beams and frame beams, effectively dissipate seismic energy. Most key members and ordinary vertical components meet the performance targets, with those non-compliant elements requiring only minor reinforcement enhancements to achieve compliance. Using simplified calculations and stress analysis, this study validates that the 150 mm thick cast-in-place slab at the weakly-connected region reliably carries and transfers stresses, meeting the performance targets of remaining elastic under design-basis earthquakes and not yielding under rare earthquake. This study confirms that the seismic safety of the super high-rise structure with weakly-connected floor slabs meets the required standards and summarizes targeted reinforcement measures for such floor systems, providing a valuable reference for similar engineering projects.