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（長安大學(xué)建筑工程學(xué)院， 西安 710064）
［摘要］對軸心受壓作用下熱軋方矩鋼管短柱的局部穩(wěn)定受力性能和設(shè)計方法進行研究。采用ABAQUS建立有限元分析模型，考慮了構(gòu)件不同初始缺陷以及殘余應(yīng)力分布的影響，并用收集到的試驗數(shù)據(jù)驗證有限元模型的可靠性。在此基礎(chǔ)上，對不同高寬比，腹板高厚比以及正則化寬厚比的截面進行參數(shù)分析。結(jié)果表明，對于較薄柔的截面，板件相關(guān)作用對構(gòu)件的軸壓極限承載力的影響很大，設(shè)計公式應(yīng)當(dāng)予以考慮。將參數(shù)分析結(jié)果與歐洲、美國、中國鋼結(jié)構(gòu)設(shè)計規(guī)范以及直接強度法中方矩管截面局部穩(wěn)定設(shè)計曲線進行對比，并提出了考慮板件相關(guān)作用的修正直接強度設(shè)計方法。結(jié)果表明修正后的直接強度法設(shè)計公式與有限元計算結(jié)果吻合很好，計算結(jié)果更為合理。
［關(guān)鍵詞］局部穩(wěn)定； 熱軋方矩鋼管截面； 軸心受壓構(gòu)件； 板件相關(guān)作用； 直接強度法
中圖分類號：TU391文獻標識碼：A文章編號：1002-848X(2019)16-0085-06
Research on local stability behavior of axially compressed stub columns with hot-rolled steel square and rectangular hollow sections considering the plate interaction
Li Liya， Lin Chenhao， Yuan Weining
(College of Civil Engineering, Chang′an University, Xi′an 710064, China)
Abstract:An investigation into the local stability behavior and the design method of hot-rolled steel square and rectangular hollow sections (SHS/RHS) stub columns under axial compression was presented. The finite element models considering both different local imperfections and residual stresses patterns were established using ABAQUS and the reliability of the finite element models was verified by collected test data. Based on that, parameter analysis on different cross-section aspect ratio, web height to thickness ratio and regularization width to thickness ratio were performed. The results show that for slender cross-sections, the element interaction influences the ultimate capacity of members under axial compression significantly, which should be considered in the design formula. The results of parameter analysis were compared with the local stability design curves of SHS/RHS in the European, American and Chinese steel structure design codes and the direct strength method, and a modified direct strength method considering the element interaction was proposed. The results show that the modified direct strength method design formula agrees well with the finite element calculation results, and the calculation results appear more reasonable.
Keywords:local stability; hot-rolled steel SHS/RHS; axial compression member; plate interaction; direct strength method
作者簡介：李利亞，博士研究生，Email: liya_chd@sina.com。
