新型铁路桥墩的抗震性能研究

发布时间：2018-04-20 10:00

本文选题：铁路桥 + 桥墩　；参考：《桥梁建设》2017年05期

【摘要】：针对铁路桥梁摇摆隔震桥墩整体侧向刚度较低的问题,提出在桥墩与承台分离处设置无粘结预应力筋,形成新型桥墩。以某单线铁路桥为例,针对其18号墩提出新型桥墩设计方案,考虑预应力钢筋及其初始预加力损失,基于OpenSees平台建立有限元模型进行地震反应分析,研究其抗震性能。结果表明:罕遇地震作用下,墩顶水平位移、竖向提离位移、墩底弯矩、摇摆反应及预加力损失明显大于设计地震作用下的相应值,但墩底弯矩的增幅小于墩顶水平位移的增幅;输入地震动强度及频谱特性对墩顶位移与墩底提离位移的影响较大,对墩底弯矩的影响相对较小;新型桥墩容易实现罕遇地震作用下不坏的抗震设防要求,具有较好的抗震性能。
[Abstract]:In order to solve the problem of low lateral stiffness of rocking isolated pier of railway bridge, a new type of pier is formed by setting unbonded prestressed tendons at the separation of pier and abutment. Taking a single track railway bridge as an example, a new design scheme of pier for pier 18 is proposed. Considering the loss of prestressed steel bar and its initial prestressing force, a finite element model based on OpenSees platform is established for seismic response analysis, and its seismic performance is studied. The results show that the horizontal displacement, vertical lift displacement, bending moment, rocking response and prestress loss of the pier under rare earthquake are obviously larger than the corresponding values under the design earthquake. However, the increase of bending moment at the bottom of the pier is smaller than that of the horizontal displacement at the top of the pier, the intensity of the input ground motion and the frequency spectrum characteristic have a great influence on the displacement of the pier top and the displacement of the lifting off the pier bottom, and the effect on the bending moment of the pier bottom is relatively small. The new pier is easy to meet the requirements of good seismic fortification under rare earthquake, and has good seismic performance.
【作者单位】：兰州交通大学土木工程学院;中铁二院工程集团有限责任公司;
【基金】：国家自然科学基金项目(51368033,51668035) 中国铁路总公司科技研究开发计划课题(2015G002-B)~~
【分类号】：U442.55;U443.22

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