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为了给带加劲肋钢-混凝土组合蜂窝梁这一新型桥梁结构形式的设计和施工提供参考,对其进行了承载能力的模型试验研究,分析了该结构的变形特征、破坏模式、承载能力和极限状态。根据弯矩-剪力相关方程推导了组合蜂窝梁的承载能力计算公式,并将分析结果与试验结果进行了对比;最后建立组合蜂窝梁的有限元计算模型,对主要参数进行了数值分析。结果表明:承载能力计算值与试验值吻合良好;开孔截面加劲前,组合蜂窝梁由于孔洞边缘局部屈曲而丧失承载能力;开孔截面加劲后,其破坏形态为弯曲破坏。
In order to provide a reference for the design and construction of a new type of bridge with stiffened steel-concrete composite honeycomb girder, the model test of its bearing capacity was carried out. The deformation characteristics, failure mode, bearing capacity and limit of the structure were analyzed status. The formula of bearing capacity of composite honeycomb girder is deduced according to the equation of moment-shear force. The analytical results are compared with the experimental results. Finally, the finite element model of composite honeycomb girder is established and the main parameters are analyzed numerically. The results show that the calculated values agree well with the experimental values. Before the perforated section is stiffened, the composite honeycomb beams lose their bearing capacity due to local buckling of the edge of the hole. After the cross-section is stiffened, the failure mode is bending failure.