高烈度区高速公路桥梁桥墩抗震计算分析研究

发布时间：2018-05-18 21:27

本文选题：装配式预应力混凝土箱梁 + 抗震计算　；参考：《长安大学》2015年硕士论文

【摘要】：装配式预应力混凝土箱梁是我国高速公路主要桥型,应用广泛。近年来地震频发,桥墩作为直接受到地震力作用影响的主要承重构件,其抗震性能尤为重要,为此,本文针对高烈度区预应力混凝土连续箱的桥墩抗震计算展开研究。本文以十堰至天水高速公路项目(甘肃段)为研究背景,对贾家山漾水河大桥第二联(4×20m)和峡口大桥第十联(3×30m)桥梁应用Midas2010有限元分析软件建立了整桥模型,并对高速公路桥梁采取的抗震构造措施及桥墩抗震配筋进行了论述。为进行对比分析研究,计算工况包括“普通盆式支座桥梁”地震动力时程分析、“普通板式支座桥梁”地震动力时程分析和“HDR隔震支座桥梁”地震动力时程分析,借鉴国内外抗震设防经验并参照现行规范进行了详细的桥墩动力特性计算分析,在E2地震作用下桥墩进入塑性状态后采用HDR隔震支座较普通盆式、板式橡胶支座,其塑性铰区横桥向剪力设计值及墩顶顺桥向位移值均有明显下降,并且仅在HDR隔震支座工况下桥墩才能满足受力及位移要求。因此,高烈度区高速公路桥梁在桥墩钢筋受到构造要求及施工工艺限制时,宜采用隔震支座,同时应根据桥墩自身受力特点合理布置桥墩钢筋。总之,本文研究成果在十堰至天水高速公路项目上得到成功应用的同时,也为高烈度区预应力混凝土箱梁桥墩的减隔震设计提供参考。
[Abstract]:Prestressed concrete box girder is the main bridge type of expressway in China, and is widely used. In recent years, as the main load-bearing member directly affected by earthquake force, the seismic behavior of pier is especially important. Therefore, the seismic calculation of prestressed concrete continuous box pier in high intensity region is studied in this paper. In this paper, based on the research background of Shiyan to Tianshui Expressway (Gansu Section), the whole bridge model is established by using Midas2010 finite element analysis software for the bridge of Jiayayangyang River Bridge and Xiakou Bridge. The aseismic construction measures and seismic reinforcement of piers are also discussed. In order to compare and study, the calculation conditions include the seismic dynamic time history analysis of "ordinary basin bearing bridge", the seismic dynamic time history analysis of "ordinary plate bearing bridge" and the seismic dynamic time history analysis of "HDR isolated bearing bridge". Referring to the experience of seismic fortification at home and abroad and referring to the current code, the dynamic characteristics of bridge pier are calculated and analyzed in detail. After the bridge pier enters plastic state under E2 earthquake, the HDR isolation bearing is more common than the basin type and the plate type rubber bearing. The shear design value of the transverse bridge in the plastic hinge region and the displacement value of the piers along the bridge are obviously decreased, and the pier can meet the requirements of the force and displacement only under the condition of the HDR isolation support. Therefore, when the reinforcement of highway bridge in high intensity area is restricted by the structural requirements and construction technology, it is appropriate to adopt the isolation support, and at the same time, the reinforcement should be reasonably arranged according to the bearing characteristics of the pier itself. In a word, the research results of this paper have been successfully applied in Shiyan-Tianshui expressway project, and also provide a reference for the seismic isolation design of prestressed concrete box girder pier in high intensity area.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U443.22

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