{"title":"FEASIBILITY STUDY ON DIAGNOSTIC IMAGING SYSTEM WITH DEEP LEARNING FOR POST-QUAKE RECCONAISSANCE ON THE 2021 EARTHQUAKE OFF THE COAST OF FUKUSHIMA PREFECTURE","authors":"Hiroyuki Chida, N. Takahashi, Tomoyuki Yamada","doi":"10.3130/aijjse.68b.0_1","DOIUrl":"https://doi.org/10.3130/aijjse.68b.0_1","url":null,"abstract":"In this study, we applied a diagnostic imaging system, which is an upgraded version of a previously proposed diagnostic imaging technology, to the actual damage inspection of timber houses damaged in the 2021 Fukushima earthquake. We also examined the relationship between pixel resolution and damage detection accuracy as a basic study of the imaging method, with an eye to self-diagnosis by occupants using smartphones. The results of damage detection and damage rate calculation using images with a pixel resolution of 0.3 mm/px or less showed that the error in the image diagnosis results was 0.133%, compared to the maximum deviation of 0.567% (assumed to be a permissible error) in the visual measurement by three persons, indicating that the damage rate could be calculated with the same or higher accuracy as the visual measurement.","PeriodicalId":166657,"journal":{"name":"Journal of Structural Engineering B","volume":"IA-17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126556392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"ROBUST OPTIMAL DESIGN BASED ON STORY DUCTILITY RATIO OF ELASTIC-PLASTIC BUILDING STRUCTURES WITH UNCERTAIN OIL DAMPERS SUBJECTED TO CRITICAL DOUBLE IMPULSE","authors":"Mizuki Hosoda, K. Fujita","doi":"10.3130/aijjse.69b.0_181","DOIUrl":"https://doi.org/10.3130/aijjse.69b.0_181","url":null,"abstract":"","PeriodicalId":166657,"journal":{"name":"Journal of Structural Engineering B","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115877935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yoshitaka Ichihara, N. Nakamura, K. Nabeshima, Byunghyun Choi, A. Nishida
{"title":"BASIC STUDY ON SEISMIC RESPNSE OF SOIL-STRUCTURE INTERACTION SYSTEM USING EQUIVALENT LINEAR THREE-DIMENSIONAL FEM ANALYSIS OF REACTOR BUILDING","authors":"Yoshitaka Ichihara, N. Nakamura, K. Nabeshima, Byunghyun Choi, A. Nishida","doi":"10.3130/aijjse.68b.0_271","DOIUrl":"https://doi.org/10.3130/aijjse.68b.0_271","url":null,"abstract":"","PeriodicalId":166657,"journal":{"name":"Journal of Structural Engineering B","volume":"30 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122554281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"FUNDAMENTAL STUDY OF LINEAR QUADRATIC REGULATOR DESIGN FOR A SEISMIC CONTROL SYSTEM TO IMPROVE RESILIENCE OF A MEDICAL FACILITY","authors":"M. Kohiyama, Kento Wakabayashi, Daigo Takahashi","doi":"10.3130/aijjse.68b.0_415","DOIUrl":"https://doi.org/10.3130/aijjse.68b.0_415","url":null,"abstract":"Regional base hospitals require high performance to maintain their functions even in the event of a large earthquake. This study proposes a method to design the parameters of a linear quadratic regulator (LQR) for a seismic control device aiming at improving the resilience of a medical facility. First, fault tree analysis was conducted to reveal the factors that hinder the recovery of medical facilities. The fragility curves and recovery-time probability models were constructed for medical devices based on the literature review and the interviews with medical device manufacturers. Using these models, the recovery curve, which is the relationship between the functional level and time, can be evaluated for the building–medical equipment system under an assumed earthquake ground motion. We propose to minimize the time to recover up to the defined functional level, 95% or 80%, in designing parameters for an LQR control system. The effectiveness of the proposed control design method was investigated for a building with a control device installed on its top floor, and it was confirmed that the proposed method improved the resilience performance compared with the conventional control method.","PeriodicalId":166657,"journal":{"name":"Journal of Structural Engineering B","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125534717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CHANGES IN GROUND PROPERTIES AFTER PENETRATION OF CLOSED-END STEEL PIPE PILES WITH FLAT WINGS IN SANDY GROUND","authors":"S. Konda, Hironobu Miyasaka, K. Yamagishi","doi":"10.3130/aijjse.68b.0_353","DOIUrl":"https://doi.org/10.3130/aijjse.68b.0_353","url":null,"abstract":"","PeriodicalId":166657,"journal":{"name":"Journal of Structural Engineering B","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129468951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}