预应力筋布置对节段拼装桥墩抗震性能的影响

Influence of prestressed strands layout on the seismic behavior of segmental bridge piers

预制节段拼装桥墩具有施工工期短、对交通影响小、质量易保证等优点,但其在抗震性能方面存在不足。为获得具有较强抗震能力的节段拼装桥墩的预应力筋布置方式,分析了四种预应力筋布置方案,基于ABAQUS建立实体有限元模型,将拟静力分析结果与既有试验结果进行对比,验证分析模型的准确性,然后分析预应力筋的布置方式对节段拼装桥墩耗能能力和残余位移等抗震性能的影响。研究结果表明中心布置预应力筋的桥墩耗能能力较好,但同时残余位移也较大;分散布置预应力筋的桥墩耗能能力较弱,但残余位移较小。本文研究结论可为预制节段拼装桥墩的抗震设计提供借鉴。

Prefabricated segmental bridge columns（ PSBC） have the advantages of speedy construction,low impact on traffic and easy quality assurance. However,there is some disadvantages in seismic capacity of PSBC. In order to get prestressed strands layout of PSBC with higher seismic capacity,researched four kinds of prestressed strands layout,developed finite element entity models by ABAQUS,compared the results of quasi-static analysis to experimental tests to validate the correction of the models,then researched the effect of prestressed strands layout on the seismic behavior of PSBC such as energy dissipation and residual drift. The results show that piers with centralized prestressed strands have better energy dissipation and bigger residual drift; while piers with decentralized prestressed strands have less energy dissipation and smaller residual drift. The results in this paper can be used in the seismic design of bridge structures with prefabricated segmental columns.