{"title":"Numerical Investigation and Design Suggestion on Patch-Loading Strength of Q690 High-Strength Steel Plate Girders at Elevated Temperature","authors":"","doi":"10.1007/s10694-023-01529-x","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>The patch-loading resistance behaviors of Q690 high-strength steel (HSS) plate girders at elevated temperatures were investigated through a parametric study. The finite element (FE) simulation method was validated with 35 experimental results from the literature. The effects of elevated temperature, web width–height ratio, loading length, and web slenderness were investigated, where 512 FE models were included. A clear reduction in ultimate strength caused by the reduction in mechanical properties was observed with increasing temperature. The effect of elevated temperatures on the stress distribution on the web was negligible. The validation of design procedures in EN 1993-1-5 and AISC 360-16 was conducted, where the elevated temperature material properties of Q690 HSS were used. The results indicated that the current specifications were overly conservative to be used directly to predict the ultimate strength of the Q690 HSS plate girder at elevated temperatures. Accordingly, a design method based on EN 1993-1-5 was proposed. The formula in EN 1993-1-5 for determining the critical buckling factor was modified by introducing an amplification factor. The strength reduction function in EN 1993-1-5 was adjusted using the modified critical buckling factor. To determine the optimal undetermined constants in the strength reduction function, statistical calibration involving 400 combinations of 2 undetermined constants was performed for each pre-determined temperature. Two formulas with temperature as a variable were proposed to determine these undetermined constants directly. Based on the comparison, the accuracy of the proposed design method was better than those of the design methods in EN 1993-1-5 and AISC 360-16.</p>","PeriodicalId":558,"journal":{"name":"Fire Technology","volume":null,"pages":null},"PeriodicalIF":2.3000,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Fire Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s10694-023-01529-x","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The patch-loading resistance behaviors of Q690 high-strength steel (HSS) plate girders at elevated temperatures were investigated through a parametric study. The finite element (FE) simulation method was validated with 35 experimental results from the literature. The effects of elevated temperature, web width–height ratio, loading length, and web slenderness were investigated, where 512 FE models were included. A clear reduction in ultimate strength caused by the reduction in mechanical properties was observed with increasing temperature. The effect of elevated temperatures on the stress distribution on the web was negligible. The validation of design procedures in EN 1993-1-5 and AISC 360-16 was conducted, where the elevated temperature material properties of Q690 HSS were used. The results indicated that the current specifications were overly conservative to be used directly to predict the ultimate strength of the Q690 HSS plate girder at elevated temperatures. Accordingly, a design method based on EN 1993-1-5 was proposed. The formula in EN 1993-1-5 for determining the critical buckling factor was modified by introducing an amplification factor. The strength reduction function in EN 1993-1-5 was adjusted using the modified critical buckling factor. To determine the optimal undetermined constants in the strength reduction function, statistical calibration involving 400 combinations of 2 undetermined constants was performed for each pre-determined temperature. Two formulas with temperature as a variable were proposed to determine these undetermined constants directly. Based on the comparison, the accuracy of the proposed design method was better than those of the design methods in EN 1993-1-5 and AISC 360-16.
期刊介绍：
Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis.
The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large.
It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.
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