摘要
倒三角形高强钢可移动桥梁是一种新型桁架结构体系,因此有必要对其整体稳定性进行深入的研究。基于已有的BS700高强钢材料性能试验,提出了有限元模型使用的材料模型。建立了51 m跨度桥梁的有限元模型,并与实桥加载试验进行了对比,验证了有限元模型的精确性。在综合考虑材料和几何双重非线性的基础上,进行桥梁的非线性屈曲分析,得到桥梁的极限承载力和稳定安全系数。然后对影响桥梁极限承载能力的因素进行分析,分析结果表明:上弦杆、桥梁高度是影响桥梁极限承载力的重要因素,其中上弦杆1的影响最大;车辙宽度、下弦杆和斜腹杆对桥梁极限承载力影响较小,直腹杆的影响略大于斜腹杆的影响。
Removable inverted-triangular high-strength steel bridge is a novel truss structure,so it is necessary to conduct stability analysis for this structure. According to the existing material property test of BS700 high-strength steel,the material model for the finite element model was put forward. The finite element model（ FEM） for the bridge with the span of 51 meters was built,and then a real bridge was tested for verifying the accuracy of the FEM. Considering material and geometric nonlinearity,the nonlinear buckling analysis of the bridge was performed. Then the ultimate bearing capacity and safety stability factor were obtained. The influencing factors of the bridge＇s ultimate bearing capacity were performed,the results showed that the upper chords and the bridge height were the main factors which might influence the bridge ＇s ultimate bearing capacity,and the upper chord 1 had the greatest impact. The influence of track width,lower chord and diagonal web members were limited. The influence of the web members was bigger than the diagonal web members＇.
出处
《钢结构》
北大核心
2016年第5期25-30,共6页
Steel Construction
基金
国家重点基础研究发展计划项目(2014CB046801
2014CB046804)
国家自然科学基金项目(51178458)
关键词
倒三角形
高强钢
非线性屈曲分析
极限承载力
影响因素
inverted-triangular
high-strength steel
nonlinear buckling analysis
ultimate bearing capacity
influence factor
