轴—弯—剪耦合作用下高铁桥墩抗震性能分析

发布时间：2018-05-17 08:45

本文选题：高铁桥墩抗震 + 非线性剪切　；参考：《北京交通大学》2017年硕士论文

【摘要】：高速铁路建设正在国内外大规模展开。由于高速列车行驶的安全性、平顺度及乘坐舒适度的要求,高铁桥墩的尺寸往往偏大,在某些情况下不可避免地设计成短柱。而现行规范下的高铁桥墩钢筋含量相对较低,造成了其易发生剪切及弯剪形式破坏。为了研究高铁桥墩的抗震性能,本文基于OpenSees的纤维梁柱模型,采用建立考虑不同因素的数值模型,研究了考虑非线性剪切作用的中小剪跨比墩柱。主要完成了以下工作:(1)建立了考虑小剪跨比试件剪切效应的弯剪耦合和非耦合模型,用其分析结果与试验结果对比,以评价两种模型在考虑剪切效应方面的准确度。(2)分别建立了 6个高铁桥墩的弯曲-粘结滑移和弯曲-剪切-粘结滑移模型,并以试验测得的数据为基准研究了高铁桥墩的抗剪承载能力和抗震性能的一系列指标,进行了考虑非线性剪切成分的拟静力加载下的残余位移延性系数的分析。(3)分离了墩顶位移成分,尝试用剪切与弯曲成分的比值作为判定高铁桥墩破坏方式的依据,此方法可作为桥梁设计或验算中的一种辅助手段。(4)对桥墩模型进行了地震时程分析,估计了考虑剪切作用桥墩的地震下抗剪承载能力,初步进行了考虑剪切和不考虑剪切作用下桥墩震后侧移角的比较。
[Abstract]:The construction of high-speed railway is being carried out at home and abroad. Due to the requirements of safety, ride comfort and ride comfort of high-speed trains, the size of high speed railway piers is often too large, so it is inevitable to design short columns in some cases. However, the steel bar content of high-speed bridge piers is relatively low under the current specifications, which leads to the failure of shear and flexural shear forms. In order to study the seismic behavior of high speed bridge pier, based on the fiber Liang Zhu model of OpenSees, a numerical model considering different factors is established to study the small shear span ratio pier column with nonlinear shear. In this paper, the following work is done: 1) the coupled and uncoupled bending shear models considering shear effects of small shear span ratio specimens are established, and the results are compared with the experimental results. In order to evaluate the accuracy of the two models in considering shear effect, six flexural and bond-slip models and bending shear-bond-slip models of high iron bridge piers are established, respectively. Based on the experimental data, a series of indexes of shear bearing capacity and seismic performance of high-speed iron piers are studied. The residual displacement ductility coefficient under quasi-static loading considering nonlinear shear component is analyzed. The displacement components at the top of the pier are separated. The ratio of shear to bending component is used as the basis for judging the failure mode of high speed bridge pier. This method can be used as an auxiliary method in bridge design or checking calculation. The seismic time history analysis of pier model is carried out, and the shear bearing capacity of pier under earthquake is estimated. The lateral displacement angle of the pier after the earthquake is compared with that of the bridge pier considering shear and not considering the shear action.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U443.22

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