高强钢箱形偏压构件局部和整体相关屈曲研究

发布时间：2018-05-06 09:28

本文选题：高强钢 + 焊接箱形截面　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：近年来，高强钢(fy≥460MPa)焊接箱形构件已经成功应用于多个钢结构实际工程，并获得较好的经济效果。钢材强度的提高使构件壁板更易局部失稳，若继续采用现行钢结构规范中限定壁板宽厚比的做法，不利于充分发挥高强钢的性能。适当放宽壁板宽厚比，利用其屈曲后强度，可达到节约钢材、降低造价的目的。国内外研究主要集中在高强钢轴心受压构件局部-整体相关屈曲，对工程中常见的压弯构件研究较少。有鉴于此，本文对Q460钢焊接箱形压弯构件相关屈曲承载性能与计算方法进行研究。综合考虑构件初始几何缺陷(整体、局部初弯曲)、残余应力，以及几何、材料非线性的影响，采用有限元软件ANSYS建立有限元模型，并利用已有试验数据对有限元模型进行验证。利用已验证的有限元模型进行变参分析，研究壁板宽厚比、构件长细比和截面边长比对偏压构件局部-整体相关屈曲承载力的影响。基于参数分析所得数据，参考有效屈服强度法及直接强度法，考虑压弯构件相关屈曲稳定承载力的影响因素，，采用构件毛截面属性，提出直接以构件几何参数为自变量的相关屈曲承载力公式。改变数值模型参数取值，计算获取一组数据以验证推荐公式的有效性。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

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