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【提要】 采用ANSYS軟件中【板殼】，考慮雙重非線性，對(duì)梁端受等彎矩、不等同號(hào)彎矩、不等異號(hào)彎矩和梁上均布荷載和兩端簡(jiǎn)支與固接情況下雙段變截面H型鋼梁進(jìn)行了全過(guò)程分析，并同時(shí)考慮了縱向焊接殘余應(yīng)力、初始幾何缺陷的影響。根據(jù)獲得的構(gòu)件荷載位移曲線和不同荷載時(shí)刻的構(gòu)件整體與局部變形形態(tài)，對(duì)比分析了不同荷載工況對(duì)雙段變截面梁的承載力、整體剛度、相關(guān)屈曲、塑性擴(kuò)展等性能的影響。研究結(jié)果表明，對(duì)于受彎矩作用的雙段變截面H型鋼薄壁梁，其腹板寬厚比可盡量取大值；剪力對(duì)梁的相關(guān)屈曲性能影響很大，對(duì)主要受剪力作用的梁，要防止發(fā)生腹板局部屈曲；固接約束極大改善構(gòu)件性能。
【關(guān)鍵詞】 相關(guān)屈曲 雙段【截面 H】鋼薄壁梁 荷載工況 雙重非線性
Interactive Buckling Analysis for Hsection Double Tapered Steel Beams Under Various Loading Style/Yang Na, Long Lihua, Yang Qingshan(School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044,China)
Abstract:The interactive buckling performance of double tapered Hsection steel beams used in portal frame structures is analyzed by ANSYS, in which geometric and material nonlinearity are considered and shell element is adopted. According to the loaddeflection curves and deformation shapes of members obtained, interactive buckling, global stiffness and capability and plasticityspreading behaviors of Hsection tapered beams under different loading are discussed. Some valuable conclusions are drawn.
Keywords:buckling; double tapered Hsection; steel beams; thin web；loading style；geometric and material nonlinearity

*國(guó)家自然科學(xué)基金資助項(xiàng)目（50308001）。