王文炜1,周畅1,薛彦杰1,宋元印1,2.外置耗能钢板预制拼装桥墩抗震性能研究[J].湖南大学学报:自然科学版,2020,(9):57~68
外置耗能钢板预制拼装桥墩抗震性能研究
Research on Seismic Performance of Prefabricated Bridge Pierswith External Energy-dissipation Plates
  
DOI:
中文关键词:  预制拼装桥墩  外置耗能钢板  抗震性能  自恢复能力  有限元分析
英文关键词:prefabricated segmental bridge pier  external energy-dissipation plates  seismic performance  self-recovering capacity  finite element analysis
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作者单位
王文炜1,周畅1,薛彦杰1,宋元印1,2 (1. 东南大学 交通学院江苏 南京 2111892. 中铁工程设计咨询集团有限公司北京 100071) 
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中文摘要:
      为推广预制拼装桥墩在中高烈度地震区的应用,在墩底外侧设置耗能钢板,并与整体现浇桥墩、内置耗能钢筋的预制拼装桥墩进行拟静力对比分析,从滞回曲线、骨架曲线、累积耗能及可恢复性等方面,研究了建议结构的合理性. 基于三线型骨架曲线模型提出了外置耗能钢板预制拼装桥墩骨架曲线计算方法,并与数值模拟结果进行对比,两者吻合程度较高. 将预应力度、预应力钢绞线布置位置、耗能钢板用量以及开槽率作为变量,通过PUSHOVER方法对外置耗能钢板预制拼装桥墩的抗震性能进行了分析. 结果表明,增大预应力度可提高承载力和刚度,同时延性有所降低. 预应力钢绞线布置在周围时,桥墩的承载力、刚度与耗能能力得到提高. 钢绞线布置在中心时,桥墩延性有所提高,屈服后变形能力较强. 增加耗能钢板用量可提高桥墩的承载力和刚度. 增加耗能钢板用量能够在一定程度上弥补开槽率的增大对结构的不利影响.
英文摘要:
      To expand the application of prefabricated segmental bridge piers in middle and high intensity seismic region, energy dissipating steel plates are set at the outer side of the pier bottom. The performance of the prefabricated bridge piers with external energy-dissipation plates under quasi-static loading was analyzed and compared with that of the cast-in-place piers as well as the prefabricated piers with built-in energy dissipating steel bars. The rationality of the proposed prefabricated piers is studied from the aspects of hysteretic curve, skeleton curve, cumulative energy consumption and recoverability. Based on the three line skeleton curve model, a calculation method for the skeleton curve of prefabricated pier with external energy dissipating steel plates is proposed. The predictions from the proposed method are compared with the numerical simulation results, and both are in good agreement. The seismic performance of the prefabricated piers with externally placed energy consuming steel plates is analyzed by Pushover Method. The results show that increasing the prestressing level can increase the bearing capacity and stiffness, while reduce the ductility. When the prestressed steel strand is arranged around, the bearing capacity, stiffness and energy dissipation capacity of the pier are improved. When the steel strand is arranged in the center, the ductility of the pier is improved and the deformation capacity is strong after yielding. Increasing the amount of energy dissipation steel plate can improve the bearing capacity and stiffness of piers. To a certain extent, increasing the amount of energy dissipation steel plates can compensate for the adverse effect of the increase of slotting rate on the structure.
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