In a groundbreaking study published in ‘Frontiers in Built Environment,’ researchers have introduced a low-cost rolling base isolation system (RBIS) designed specifically for rubble stone masonry buildings in the Himalayan mountain range. This innovative approach not only addresses the urgent need for seismic protection in a region prone to earthquakes but also emphasizes the use of locally sourced materials and simple construction techniques, making it accessible for local workers.
Lead author Jiro Takagi from the Graduate School of Urban Environmental Sciences at Tokyo Metropolitan University explains the significance of the research: “Our goal was to create a system that not only enhances safety during seismic events but also supports local economies by utilizing materials that are readily available in the region.” The RBIS comprises a unique combination of styrofoam, concrete slabs, and cast-iron balls, forming a base isolation layer that effectively absorbs seismic shocks. During large earthquakes, the cast-iron balls roll within the styrofoam, allowing for horizontal movement that mitigates the impact on the structure above.
The findings from quasi-static cyclic loading experiments and shaking table tests reveal promising results. The recorded maximum accelerations were approximately 0.2g, which suggests that buildings equipped with RBIS can withstand ground motions with a peak ground acceleration (PGA) of up to 0.5g. This is a significant improvement over traditional masonry structures, which typically resist ground motions only up to 0.15g. Such advancements could have profound implications for the construction industry, particularly in earthquake-prone regions.
Takagi’s research underscores the potential for RBIS to revolutionize building practices in the Himalayas, where many structures are made from rubble stone masonry. By simplifying the construction process and relying on local resources, this system could lead to widespread adoption, ultimately saving lives and reducing economic losses during seismic events. The commercial impact is substantial; local construction companies could capitalize on this technology, creating safer buildings while simultaneously boosting their bottom lines.
As the construction sector increasingly seeks sustainable and cost-effective solutions, the RBIS stands out as a model for future developments. By marrying innovative engineering with community-centric practices, Takagi’s work may inspire similar initiatives in other vulnerable regions around the world.
For more information about the research and its implications, you can visit the Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University.
