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本文采用非线性有限元法,对空钢管桁梁、上弦填混凝土桁梁、上下弦均填混凝土桁梁的抗弯性能进行分析,并将结果进行对比。研究表明:弦杆内填混凝土提高了桁梁的整体承载能力,且上下弦均填混凝土桁梁承载力提高的幅度较大;弦杆内填混凝土也提高了桁梁中受压弦杆、受拉杆件的内力,同时提高了受拉竖腹杆和受压斜腹杆的内力;无论是否填充混凝土,桁架整体变形相对较小,其破坏主要受到节点相对变形量的控制。
In this paper, the nonlinear finite element method is used to analyze the flexural behavior of the concrete-filled steel truss girders, the concrete filled steel truss girders, the concrete chords filled with both upper and lower chords, and the results are compared. The results show that the concrete filling in the chord increases the overall carrying capacity of the truss girder, and the bearing capacity of the truss girder with both up and down chords increases greatly. The concrete filled with the chord also enhances the compression chords in the truss girder. The internal force of the tension member and the internal force of the tensioned web and the tensioned web are increased. The overall deformation of the truss is relatively small with or without concrete filling, and the damage is mainly controlled by the relative deformation of the joint.