- 摘 要
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(河南工業(yè)大學土木工程學院, 鄭州 450001)
摘要: 為了研究國產 Q460 高強鋼焊接 T 形截面軸心壓桿的整體穩(wěn)定承載力,用厚度為 8mm 和 12mm 的國產Q460 高強度鋼板制作了 3 根焊接 T 形截面試件進行軸心受壓試驗. 基于實測的鋼材力學性能、截面殘余應力和試件幾何尺寸,建立考慮了初始幾何缺陷和力學缺陷的有限元模型,分析預測試件的極限承載力,并將有限元結果與試驗結果進行對比,驗證有限元分析方法的正確性. 利用經試驗驗證的有限元分析方法,補充計算了 24 根不同長細比壓桿的整體穩(wěn)定極限承載力,將相應的整體穩(wěn)定系數(shù)與《鋼結構設計標準》(GB 50017—2017)中的柱子穩(wěn)定系數(shù)曲線進行比較. 研究表明,國產 Q460 高強鋼焊接 T 形截面軸心壓桿的整體失穩(wěn)形式為繞對稱軸的彎扭失穩(wěn),失穩(wěn)時壓桿進入了彈塑性變形階段,在設計過程中選取 b 類截面柱子曲線對其進行計算是安全可靠的.
關鍵詞: 高強鋼; 焊接 T 形截面; 軸心壓桿; 整體穩(wěn)定; 極限承載力; 有限元分析
中圖分類號:TU391 文獻標志碼:A 文章編號:1002-848X(2023)10-0062-05
DOI:10. 19701 / j. jzjg. 20210031
Research on overall stability bearing capacity of domestic Q460 high strength steel welded T-section columns under axial compression
XIONG Xiaoli, DU Kun, MA Meng
(College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China)
Abstract: In order to study the overall stability capacity of domestic Q460 high strength steel welded T-section columnsunder axial compression, three T-section columns were welded with 8mm-thick and 12mm-thick Q460 high strength steelplates made in China were made for axial compression test. The finite element models were built up according to measuredmechanical properties of steel, section residual stress and measured sizes of members. And residual stress and initialgeometric imperfection were considered in the finite element models to analyze and predict the ultimate bearing capacity ofthe columns. The finite element results were compared with the experimental results to verify the correctness of the finiteelement analysis method. Based on the finite element analysis method verified by experiment, the overall stable ultimatebearing capacity of 24 different slenderness columns were calculated and compared with column stability coefficient curvesin Standard for design of steel structures(GB 50017—2017). The study shows that the overall instability form of domesticQ460 high strength steel welded T-section columns was bending and torsional around the symmetry axis, and thecompression columns enter the elastic-plastic deformation stage when the instability occurs. It is safe and reliable to selectthe stability coefficient curve of the type b columns to calculate in the design process.
Keywords:high strength steel; welded T-section; axial compression column; overall stability; ultimate bearing capacity;finite element analysis
∗國家自然科學基金(51308194).
第一作者:熊曉莉,博士,副教授,碩士生導師,主要從事結構穩(wěn)定理論研究、建筑鋼結構設計原理及應用、新型倉儲結構力學性能研究與應用,Email:x_shanley@ sina. com.
[引用本文] 熊曉莉,都坤,馬萌. 國產 Q460 高強鋼焊接 T 形截面軸心壓桿整體穩(wěn)定承載力研究[J]. 建筑結構,2023,53(10):62-66,121. XIONG Xiaoli,DU Kun,MA Meng. Research on overall stability bearing capacity of domestic Q460 highstrength steel welded T-section columns under axial compression[J]. Building Structure,2023,53(10):62-66,121.
