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为揭示外伸悬挑组合式锅炉大板梁的受力机理和破坏模式,并验证某工程大板梁的设计可靠性,通过对外伸悬挑组合式大板梁缩尺模型的静力试验和考虑各种非线性的ABAQUS有限元数值模拟分析,研究了大板梁简支段和悬挑段在各加载阶段的承载力、局部应力、整体变形和局部屈曲等关键响应,对试验中的破坏现象给出了合理解释,并重点研究了悬挑段与简支段拼接端板与拼接螺栓的受力和变形特点。试验与模拟结果均表明大板梁在设计荷载作用下处于线弹性阶段,并具有足够的安全储备;支座附近腹板局部屈曲和悬挑段端板拼接螺栓断裂是大板梁的主要破坏模式,决定了梁的整体承载力;按拼接螺栓群的受力模式,悬挑梁端的弯矩和剪力分别由翼缘附近螺栓的抗拉连接和腹板附近螺栓的摩擦连接来承担。各阶段试验现象和数值模拟结果吻合较好,也验证了数值模拟方法的可靠性。
In order to reveal the stress mechanism and failure mode of overhanging cantilever large boiler girder and verify the design reliability of a large plate girder of a project, Considering all kinds of nonlinear ABAQUS finite element numerical simulation analysis, the key response such as bearing capacity, local stress, integral deformation and local buckling of simple supported section and cantilevered section of large slab beam were studied. The phenomenon is given a reasonable explanation, and the stress and deformation characteristics of the splicing end plate and the splicing bolt are mainly studied. The experimental and simulation results show that the plate girder is in a linear elastic stage under the design load and has sufficient safety reserve. The local buckling of the web near the bearing and the breaking of the splicing bolts on the end plate of the overhanging section are the major failure modes , Which determines the overall bearing capacity of the beam. The bending moment and shear force of the cantilever beam end are respectively assumed by the tensile connection of the bolt near the flange and the frictional connection of the bolt near the web by the stress mode of the splice bolt group. The experimental results of all stages agree well with the numerical simulation results, and the reliability of the numerical simulation method is also verified.