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该文以某双层高架桥为背景,设计了两个配筋率不同的双层高架桥梁框架墩模型,采用拟静力试验结合理论分析研究了立柱纵筋配筋率对双层高架桥梁抗震性能的影响。试验结果表明:立柱配筋率较高时,横梁和节点会发生严重的损伤;减小立柱配筋率后,破坏主要集中于立柱,横梁和节点的损伤得到了有效控制;同时桥墩的延性能力提高。根据试验结果建立了桥墩的有限元分析模型,并通过该模型进行了参数分析,结果表明随着配筋率增加,双层高架桥梁的延性能力逐渐下降,同时横梁会先于立柱发生破坏,导致结构不能满足强梁弱柱的性能目标。
In this paper, a two-storey viaduct as the background, two double-girder bridge frame pier models with different reinforcement ratios were designed. The quasi-static test and theoretical analysis were used to study the effect of longitudinal reinforcement ratio on the seismic performance of double- Impact. The results show that the damage of beams and joints will be seriously damaged when the ratio of column reinforcement is high. After the reinforcement ratio of columns is reduced, the damage mainly concentrated on the columns, beams and joints is effectively controlled. At the same time, the ductility of the piers improve. Based on the experimental results, the finite element model of bridge piers was established and the parameters of the bridge piers were analyzed. The results show that the ductility of the double-deck viaduct gradually decreases with the increase of the reinforcement ratio, and the beams will collapse before the columns, The structure can not meet the performance target of strong beam and weak column.