New health assessment of structures and buildings - Measurement of strain tensor
Social Infrastructure (Saitama University Research Seed Collection 2025-27 p.21)
Keywords: strain tensor, structure, tunnel, rock mass, concrete
Japan is located on a plate boundary, which results in a very high frequency of earthquakes globally, and consequently, there is a significant amount of damage to buildings. When an earthquake occurs, you may feel the "shaking." Earthquakes generate waves, causing the ground to shake and move in a repetitive manner. During this time, structures such as buildings and elevated structures experience complex movements, making it extremely difficult to accurately assess the internal deformations of these structures. Our research group has developed a technique to capture the detailed deformation (strain tensor) of small cylindrical rock samples with natural sedimentary structures in order to investigate the deformation of bedrock in detail, thereby improving accuracy. This method can be applied to buildings as long as the application points are creatively designed, regardless of the shape. In the future, we aim to utilize this technique for assessing the health of buildings and concrete structures during complex deformations, such as those occurring during earthquakes.
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Yota Togashi, Associate Professor Graduate School of Science and Engineering, Department of Environmental Social Infrastructure, Field of Social Infrastructure Creation 【Recent Research Themes】 ● Stability of rock excavation faces ● Deformation anisotropy of rock masses ● Unsaturated permeability characteristics around tunnels ● Under-track crossing structures
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【Appeal Points to the Industry】 ● When coring concrete structures, installing strain gauges on cylindrical specimens and backfilling allows for the measurement of the local strain tensor of the member. ● By measuring the strain tensor, the values and directions of the three principal strains can be identified. ● The rotation of the principal strain direction during an earthquake can be accurately measured. ● Residual strains can also be identified. 【Examples of Practical Use, Applications, and Utilization】 ● Members of concrete structures ● Tunnels ● Rock structures
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.
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