后张无粘结预应力装配式桥墩抗震性能分析

发布时间：2018-03-28 19:17

本文选题：装配式桥墩　切入点：有限元模型　出处：《沈阳建筑大学学报(自然科学版)》2014年03期

【摘要】：目的研究节段预制无粘结后张预应力环形截面桥墩的抗震性能,为此类桥墩抗震设计提供依据.方法通过贯穿柱段的纵向钢筋(耗能钢筋ED)提供柱的滞回耗能,利用ABAQUS有限元分析软件建立实体模型,对耗能钢筋配筋率、预应力筋配筋率、预应力度等参数进行分析.结果 ED配筋率为0.75%时的抗震性能比0.5%时提高较多,配筋率为1.0%的抗震性能比0.75%时提高不大.预应力筋配筋率在0.5%时具有较好的抗震性能,在此基础上提高配筋率没有显著效果.预应力度的增加使得屈服强度有所提高,但耗能能力提高不明显.结论在一定范围内提高ED配筋率和预应力筋配筋率对于提高桥墩抗震性能有较为显著的效果,超过此范围提高不明显,预应力度影响不大,以此实现节段拼装桥墩经济性和力学性能的优化.
[Abstract]:Aim to study the seismic behavior of prefabricated unbonded prestressed ring section piers in order to provide basis for seismic design of this kind of piers. Methods the hysteretic energy dissipation of columns is provided by longitudinal reinforcement (EDR) through columns. ABAQUS finite element analysis software was used to establish solid model to analyze the reinforcement ratio of energy dissipation bar, the reinforcement ratio of prestressing bar and the degree of prestress, etc. Results the seismic performance of Ed reinforced bar with 0.75 reinforcement ratio was much higher than that with 0.5 reinforcement ratio. When the reinforcement ratio is 1.0%, the seismic performance is not much higher than that at 0.75. The prestressing reinforcement ratio has better seismic performance at 0.5%, and on this basis, the increase of reinforcement ratio has no significant effect. The yield strength is increased with the increase of prestress degree. However, the improvement of energy dissipation capacity is not obvious. Conclusion the improvement of Ed reinforcement ratio and prestressed reinforcement ratio in a certain range has a significant effect on improving the seismic performance of bridge piers, but beyond this range the improvement is not obvious, and the influence of prestress degree is not obvious. The optimization of economic and mechanical properties of segmental assembled piers is realized.
【作者单位】：沈阳建筑大学土木工程学院;
【基金】：国家自然科学基金项目(51078242) 住房和城乡建设部科学技术项目(2012-K2-31) 辽宁省“百千万人才工程”人选项目择优资助(2012921047)
【分类号】：U442.55

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