Evaluate the seismic resistance of the building by comparing the structural seismic index (Is) and the structural seismic judgment index (Iso)!
In the 1995 Hyogo Prefecture Southern Earthquake, significant damage was observed in buildings constructed under the old standards prior to the seismic design code established in 1981. To understand the seismic performance of these buildings and ensure seismic safety, it is necessary to conduct a "seismic diagnosis." In this diagnosis, the seismic performance of the building is evaluated by comparing the structural seismic index (Is) calculated for the building with the structural seismic judgment index (Iso) required for that building. 【Structural Seismic Index (Is)】 ■ The Is value is calculated for each floor and direction of the building. ■ Is = Eo × SD × T - Eo: Basic performance index derived from strength and ductility - SD: Shape index, a correction factor based on shape and weight balance - T: Age index, a correction factor for aging deterioration such as cracks, deformation, and aging *For more details, please refer to the PDF materials or feel free to contact us.
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【Structural Seismic Assessment Index (Iso)】 ■Iso = Es × Z × G × U ・Es: Basic seismic assessment index 1st level = 0.8, 2nd and 3rd levels = 0.6 ・Z: Regional index, a correction factor based on the seismic activity level of the area and the expected strength of seismic motion ・G: Ground index, a correction factor based on the amplification characteristics of the surface ground, topographical effects, and the interaction between the ground and the building ・U: Usage index, a correction factor based on the purpose of the building *For more details, please refer to the PDF document or feel free to contact us.
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Buildings Vulnerable to Earthquakes ■ Irregular floor shape ■ Buildings constructed in areas with poor terrain (cliffs, basins) and ground conditions ■ Uneven wall arrangement ■ Buildings with low concrete strength ■ Buildings with pilotis ■ Deteriorated buildings (cracks, carbonation, rust) *For more details, please refer to the PDF document or feel free to contact us.*
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Since our establishment, our company has adhered to the corporate philosophy of "providing accurate and high-quality ground information," offering consistent technology from ground to foundation to building for our customers. In addition, with a broad perspective on the future of society, we are committed to the refinement and development of technology, the sustainable provision of high-quality information, and the training of engineers who support these efforts, contributing to the reduction of our customers' risks and the improvement of their outcomes. Please feel free to contact us if you have any requests.