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对荷载作用下采用焊接钢板加固的W型钢梁的性能和承载力进行有限元研究。通过6个荷载作用下的焊接钢板加固的钢梁试验验证有限元模型。采用该模型对加固梁,焊接时预载的大小,未加固梁的初始缺陷等几个主要参数的影响进行分析。数值分析结果表明:加固时预载大小的增加导致加固梁侧扭屈曲破坏极限承载力降低,与每个翼缘都用焊接钢板相比,只在受拉翼缘焊接钢板,承载力降低更显著。研究也显示,未加固梁的初始缺陷变化影响了加固梁的极限承载力。当预载的大小及初始缺陷的影响达到临界状态时,梁发生屈服破坏。
The finite element analysis of the performance and bearing capacity of the W-shaped steel beam reinforced by welded steel plate under load is carried out. The finite element model was verified by the steel beam reinforced with welded steel plate under 6 loads. This model is used to analyze the influence of several main parameters such as the strengthening beam, the size of the preloading during welding and the initial defect of the unreinforced beam. Numerical analysis results show that the ultimate load-bearing capacity of the torsional buckling on the beam side decreases with the increase of the pre-load in the reinforcement. Compared with the welded steel plates in each flange, the bearing capacity decreases only more when the flanges are welded . The research also shows that the initial defect of unrestrained beam affects the ultimate bearing capacity of the reinforced beam. When the size of the preload and the impact of the initial defect to a critical state, the beam yield yield damage.