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建立了广州珠江黄埔大桥大跨径正交异性钢箱梁桥支撑体系的有限元模型,计算了正常载重车和3倍超载车作用下桥面铺装层内部的应力和应变,分析了桥面铺装材料需要满足的强度、变形等性能指标。以有限元分析为依据,研制了新型环氧树脂基混凝土,通过4点弯曲试验,对新材料的强度、极限应变等性能参数进行了评估。计算和试验结果表明,在桥面铺装材料的性能设计中需要更多地考虑轮载局部作用下铺装层内的应力状态和变形情况;新研制的环氧树脂基混凝土的基本力学性能满足相应的性能指标,是值得进一步系统研究的潜在大跨径钢箱梁桥桥面铺装材料。
The finite element model of the supporting system for the long-span orthotropic steel box girder bridge of the Zhujiang Huangpu Bridge in Guangzhou is established. The stress and strain inside the bridge deck pavement under normal load and three times overloading vehicles are calculated. Pavement materials need to meet the strength, deformation and other performance indicators. Based on the finite element analysis, a new type of epoxy resin-based concrete was developed. The 4-point bending test was carried out to evaluate the strength, ultimate strain and other performance parameters of the new material. The calculation and test results show that more consideration needs to be given to the stress state and deformation in the pavement layer under the action of wheel loads. The basic mechanical properties of the newly developed epoxy resin-based concrete satisfy The corresponding performance index is a potential long-span steel box girder bridge deck decking material which is worth further systematic study.