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基于梁轨相互作用原理和有限元方法,文章采用梁单元和弹簧单元模拟各结构层,建立了大跨桥上纵连板式轨道纵向力计算模型,并以某跨径为94m+168m+84m的连续刚构桥为例,计算了断板力工况下的桥上纵向附加力。计算结果表明:当考虑两股轨道同时断板的最不利情况时,取消固结机构后,受断板力影响最显著墩台的墩顶纵向水平力降幅达78%,建议固结机构抗剪设计时应保证大跨桥上板式轨道发生最不利断板的同时,固结机构也一起被剪断,以确保桥梁结构的安全。
Based on the principle of beam-rail interaction and the finite element method, the beam and spring elements are used to simulate each structural layer, and the longitudinal force calculation model of long-span slab track on long-span bridge is established. Taking a span of 94m + 168m + 84m Taking continuous rigid frame bridge as an example, longitudinal additional force on the bridge under the condition of breaking force is calculated. The calculation results show that when considering the most unfavorable condition of simultaneous breaking of two orbits, the vertical horizontal force of the pier top which is most significantly influenced by the breaking force is reduced by 78% after the consolidation mechanism is canceled. It is suggested that the consolidation mechanism should be shear resistant The design should ensure that the most disadvantageous slab plate slab track occurs at the same time, the consolidation mechanism is also cut together to ensure the safety of the bridge structure.