- 摘 要
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（西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055）
［摘要］采用有限元軟件ANSYS分析了Q460鋼寬厚比超限的焊接方形截面偏壓構(gòu)件的極限承載力，研究了板件寬厚比、構(gòu)件長細(xì)比和偏心距對構(gòu)件極限承載力的影響?；跀?shù)值模擬結(jié)果，提出了適用于Q460鋼寬厚比超限焊接方形截面偏壓構(gòu)件極限承載力的計算方法。研究結(jié)果表明，考慮幾何缺陷及殘余應(yīng)力的有限元模型能準(zhǔn)確地預(yù)測焊接箱形截面偏壓柱局部-整體相關(guān)屈曲的極限承載力；寬厚比超限的高強(qiáng)鋼壓彎構(gòu)件的Pu/Py與Mu/Mp相關(guān)曲線基本為直線，且隨著板件寬厚比（或構(gòu)件長細(xì)比）的增大，Pu/Py和Mu/Mp不斷下降。提出的建議計算方法與有限元計算結(jié)果符合良好。
［關(guān)鍵詞］高強(qiáng)鋼; 焊接方形截面; 偏壓構(gòu)件; 極限承載力; 局部-整體相關(guān)屈曲
中圖分類號：TU391，TU323.1，TU311.2 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)04-0035-04
Analysis on the ultimate carrying capacities of local-overall interaction of high-strength steel
welded square-box section columns loaded with eccentricity
Shen Hongxia, Liu Xiang
(School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)
Abstract: The ultimate bearing capacities of welded square-box section members, which were loaded with eccentricity and made from high strength steel Q460 with large width-to-thickness ratios were analyzed by finite element program ANSYS. The effect of plate width-to-thickness ratio, slenderness ratio and eccentricity length on the ultimate bearing capacity was studied. Based on the numerical simulation results, the calculation formulas were proposed to predict the ultimate strength of eccentrically loaded Q460 steel columns with large width-to-thickness ratios. Results show that the finite element model considering the geometric imperfections and residual stress can accurately predict the local-overall interaction buckling ultimate strength of the eccentrically loaded box-section columns with slender plates. The correlation curves of the Pu/Py and Mu/Mp are close to straight lines and the values of Pu/Py and Mu/Mp decrease along with the increase of plate width-to-thickness ratio (or slenderness ratio). The proposed calculation formulas are in good agreement with the numerical results.
Keywords: high strength steel; welded square box section; eccentrically-loaded member; ultimate bearing capacity; local-overall interaction buckling
*陜西省自然科學(xué)基礎(chǔ)研究計劃資助項目（2013JM7008），陜西省教育廳專項科研計劃資助項目（2013JK0978）。
作者簡介：申紅俠，博士，副教授，碩士生導(dǎo)師，Email: shenhongxia88@126.com。
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