本文選題：高強鋼 + 焊接箱形截面��； 參考：《西安建筑科技大學》2013年碩士論文

【摘要】：近年來，高強鋼(fy≥460MPa)焊接箱形構(gòu)件已經(jīng)成功應(yīng)用于多個鋼結(jié)構(gòu)實際工程，并獲得較好的經(jīng)濟效果。鋼材強度的提高使構(gòu)件壁板更易局部失穩(wěn)，若繼續(xù)采用現(xiàn)行鋼結(jié)構(gòu)規(guī)范中限定壁板寬厚比的做法，不利于充分發(fā)揮高強鋼的性能。適當放寬壁板寬厚比，利用其屈曲后強度，可達到節(jié)約鋼材、降低造價的目的。國內(nèi)外研究主要集中在高強鋼軸心受壓構(gòu)件局部-整體相關(guān)屈曲，對工程中常見的壓彎構(gòu)件研究較少。有鑒于此，本文對Q460鋼焊接箱形壓彎構(gòu)件相關(guān)屈曲承載性能與計算方法進行研究。 綜合考慮構(gòu)件初始幾何缺陷(整體、局部初彎曲)、殘余應(yīng)力，以及幾何、材料非線性的影響，采用有限元軟件ANSYS建立有限元模型，并利用已有試驗數(shù)據(jù)對有限元模型進行驗證。利用已驗證的有限元模型進行變參分析，研究壁板寬厚比、構(gòu)件長細比和截面邊長比對偏壓構(gòu)件局部-整體相關(guān)屈曲承載力的影響。 基于參數(shù)分析所得數(shù)據(jù)，參考有效屈服強度法及直接強度法，考慮壓彎構(gòu)件相關(guān)屈曲穩(wěn)定承載力的影響因素，，采用構(gòu)件毛截面屬性，提出直接以構(gòu)件幾何參數(shù)為自變量的相關(guān)屈曲承載力公式。改變數(shù)值模型參數(shù)取值，計算獲取一組數(shù)據(jù)以驗證推薦公式的有效性。
[Abstract]:In recent years, welded box members of high strength steel have been successfully applied to many practical projects of steel structures, and good economic results have been obtained. The improvement of the strength of steel makes the wall plate of the member more vulnerable to local instability. If we continue to adopt the method of limiting the ratio of width to thickness of the wall plate in the current steel structure code, it will be unfavorable to give full play to the properties of high strength steel. The steel can be saved and the cost can be reduced by loosening the ratio of width to thickness and using the strength after buckling. The research at home and abroad is mainly focused on the local-global relative buckling of high strength steel axial compression members. In view of this, the bearing capacity and calculation method of Q460 steel welded box bending members are studied in this paper. Considering the effects of the initial geometric defects (global, local initial bending, residual stress, geometric and material nonlinearity), the finite element model is established by using the finite element software ANSYS, and the finite element model is verified by the existing experimental data. Based on the verified finite element model, the effects of the ratio of wall width to thickness, the aspect ratio of the members and the ratio of the cross-section to the side length on the local and global buckling capacity of the biasing members are studied. Based on the data obtained from parameter analysis and referring to the effective yield strength method and direct strength method, considering the influence factors of the buckling stability bearing capacity of the compressive and bending members, the gross cross-section properties of the members are adopted. A formula for the buckling capacity of members with geometric parameters as independent variables is proposed. A set of data is calculated to verify the validity of the recommended formula by changing the parameters of the numerical model.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU391

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