J. Murakoshi, T. Mori, Sanshiro Haba, S. Ono, Ayumu Sato, Minoru Takahashi
{"title":"RETROFIT EFFECT OF SFRC OVERLAY ON FATIGUE DURABILITY OF ORTHOTROPIC STEEL DECKS WITH CRACKS EXTENDING TO DECK PLATE","authors":"J. Murakoshi, T. Mori, Sanshiro Haba, S. Ono, Ayumu Sato, Minoru Takahashi","doi":"10.2208/jscejseee.75.194","DOIUrl":null,"url":null,"abstract":"Since around 2000, a lot of fatigue cracks propagating into deck plate have been detected in existing orthotropic steel deck (OSD) bridges. The cause of the cracks is mainly due to out-of-plane bending of 12mm thickness deck plate. As an effective measure against those cracks, steel-fiber reinforced concrete (SFRC) overlays have been used for many existing damaged OSDs. It has been confirmed that they can drastically decrease the out-of-plane deformation of the deck plate and greatly reduce the local stress of the weld route portion where the cracks initiate. However, the effect of the SFRC overlay under the existence of deck crack inside the deck plate has not been clarified. In this paper, for the purpose of evaluating the retrofit perfor-mance under existing deck cracks, fatigue tests of the OSD specimens with pre-cracking inside the deck plates were carried out under SFRC overlay. Also, local stresses and stress intensity factors were analyzed by FEA, and effectiveness of SFRC overlay was assessed from the viewpoint of preventing the deck cracks from progressing.","PeriodicalId":303487,"journal":{"name":"Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))","volume":"5 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2208/jscejseee.75.194","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Since around 2000, a lot of fatigue cracks propagating into deck plate have been detected in existing orthotropic steel deck (OSD) bridges. The cause of the cracks is mainly due to out-of-plane bending of 12mm thickness deck plate. As an effective measure against those cracks, steel-fiber reinforced concrete (SFRC) overlays have been used for many existing damaged OSDs. It has been confirmed that they can drastically decrease the out-of-plane deformation of the deck plate and greatly reduce the local stress of the weld route portion where the cracks initiate. However, the effect of the SFRC overlay under the existence of deck crack inside the deck plate has not been clarified. In this paper, for the purpose of evaluating the retrofit perfor-mance under existing deck cracks, fatigue tests of the OSD specimens with pre-cracking inside the deck plates were carried out under SFRC overlay. Also, local stresses and stress intensity factors were analyzed by FEA, and effectiveness of SFRC overlay was assessed from the viewpoint of preventing the deck cracks from progressing.