{"title":"焊接箱形截面高温暴露后残余应力演化的实验研究","authors":"Weiyong Wang, Shiqi Qin, V. Kodur, Yuhang Wang","doi":"10.18057/IJASC.2018.14.1.5","DOIUrl":null,"url":null,"abstract":": Presence of residual stresses can significantly influence the stiffness and fatigue life of steel structures. The extent of residual stress that develops in welded box-shaped sections at room temperature is extensively studied. However, there is limited data on the development of residual stresses after fire exposure. Such fire exposure has great influence on the residual stress distribution due to temperature induced plastic deformation and creep strains in steel. In order to provide benchmark data for the theoretical models and post-fire design recommendations, this paper presents results from an experimental investigation on the post-fire residual stresses in welded box-shaped sections. The tests are carried out by sectioning method, and two types of commonly used steels, mild Q235 steel with a nominal yield stress of 235MPa and high strength Q460 steel with a nominal yield stress of 460MPa are considered. The residual stresses were evaluated after exposing the specimens to 200 ℃ , 400 ℃ , 600 ℃ and 800 ℃ and cooling down to room temperature. Data from the tests clear show that the residual stresses decrease significantly with increase in specimen temperature. Further, results from the tests are utilized to propose simplified relations for temperature induced residual stresses in welded box-section of Q235 and Q460 steels.","PeriodicalId":56332,"journal":{"name":"Advanced Steel Construction","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Experimental study on evolution of residual stress in welded box-sections after high temperature exposure\",\"authors\":\"Weiyong Wang, Shiqi Qin, V. Kodur, Yuhang Wang\",\"doi\":\"10.18057/IJASC.2018.14.1.5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\": Presence of residual stresses can significantly influence the stiffness and fatigue life of steel structures. The extent of residual stress that develops in welded box-shaped sections at room temperature is extensively studied. However, there is limited data on the development of residual stresses after fire exposure. Such fire exposure has great influence on the residual stress distribution due to temperature induced plastic deformation and creep strains in steel. In order to provide benchmark data for the theoretical models and post-fire design recommendations, this paper presents results from an experimental investigation on the post-fire residual stresses in welded box-shaped sections. The tests are carried out by sectioning method, and two types of commonly used steels, mild Q235 steel with a nominal yield stress of 235MPa and high strength Q460 steel with a nominal yield stress of 460MPa are considered. The residual stresses were evaluated after exposing the specimens to 200 ℃ , 400 ℃ , 600 ℃ and 800 ℃ and cooling down to room temperature. Data from the tests clear show that the residual stresses decrease significantly with increase in specimen temperature. Further, results from the tests are utilized to propose simplified relations for temperature induced residual stresses in welded box-section of Q235 and Q460 steels.\",\"PeriodicalId\":56332,\"journal\":{\"name\":\"Advanced Steel Construction\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.7000,\"publicationDate\":\"2018-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Advanced Steel Construction\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.18057/IJASC.2018.14.1.5\",\"RegionNum\":3,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Steel Construction","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.18057/IJASC.2018.14.1.5","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Experimental study on evolution of residual stress in welded box-sections after high temperature exposure
: Presence of residual stresses can significantly influence the stiffness and fatigue life of steel structures. The extent of residual stress that develops in welded box-shaped sections at room temperature is extensively studied. However, there is limited data on the development of residual stresses after fire exposure. Such fire exposure has great influence on the residual stress distribution due to temperature induced plastic deformation and creep strains in steel. In order to provide benchmark data for the theoretical models and post-fire design recommendations, this paper presents results from an experimental investigation on the post-fire residual stresses in welded box-shaped sections. The tests are carried out by sectioning method, and two types of commonly used steels, mild Q235 steel with a nominal yield stress of 235MPa and high strength Q460 steel with a nominal yield stress of 460MPa are considered. The residual stresses were evaluated after exposing the specimens to 200 ℃ , 400 ℃ , 600 ℃ and 800 ℃ and cooling down to room temperature. Data from the tests clear show that the residual stresses decrease significantly with increase in specimen temperature. Further, results from the tests are utilized to propose simplified relations for temperature induced residual stresses in welded box-section of Q235 and Q460 steels.
期刊介绍:
The International Journal of Advanced Steel Construction provides a platform for the publication and rapid dissemination of original and up-to-date research and technological developments in steel construction, design and analysis. Scope of research papers published in this journal includes but is not limited to theoretical and experimental research on elements, assemblages, systems, material, design philosophy and codification, standards, fabrication, projects of innovative nature and computer techniques. The journal is specifically tailored to channel the exchange of technological know-how between researchers and practitioners. Contributions from all aspects related to the recent developments of advanced steel construction are welcome.