Author(s): Rini Adiastuti, Dimas Wibowo and Maya Kartikasari

Abstract: This study investigates the performance of seismic base isolation systems in multi-storey reinforced concrete structures located in high seismic zones, with the objective of enhancing structural safety and resilience under severe earthquake loading. Three isolation systems Lead Rubber Bearings (LRB), High-Damping Rubber Bearings (HDRB), and Friction Pendulum Systems (FPS) were analytically evaluated using nonlinear time-history analysis based on real ground motion records, including the El Centro (1940), Kobe (1995), and Bhuj (2001) earthquakes. The comparative performance was assessed in terms of base shear, inter-storey drift, peak floor acceleration, and isolator displacement. Statistical analysis employing one-way ANOVA confirmed significant differences among the systems, demonstrating that all base-isolated models substantially outperformed the fixed-base configuration. The results revealed that the FPS system achieved the greatest reduction in base shear (62%) and floor acceleration (68%), followed closely by the LRB and HDRB systems, which also exhibited effective damping characteristics. However, HDRB isolators showed slightly higher displacement demands, suggesting a need for careful design considerations in tall structures. The findings further indicate that the efficiency of base isolation decreases with increasing building height due to higher-mode effects, emphasizing the importance of height-dependent optimization. Practical recommendations derived from the study advocate for isolator selection based on seismic hazard characteristics, adoption of performance-based design procedures, and refinement of code provisions to incorporate nonlinear isolator behavior and soil-structure interaction. Overall, this research reinforces the viability of base isolation as a robust seismic protection strategy for multi-storey buildings in high-risk zones, ensuring enhanced safety, reduced damage, and post-earthquake functionality.

Pages: 24-29 | Views: 6 | Downloads: 4

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