基于OpenSees非规则桥梁高墩抗震延性分析
发布时间：2018-10-18 09:34
【摘要】：我国西部地区受地形地貌的影响，修建公路和铁路基础设施时不得不建造众多的高墩大跨桥梁，这些桥梁属于典型的非规则桥梁，目前并无相关抗震规范可以直接应用。对此类桥梁的抗震延性研究较少，远远达不到实际工程的需要。为了分析桥梁高墩在地震作用下的延性行为，，本论文主要做了以下一些工作： 通过OpenSees软件建立了三个基于弹塑性纤维梁柱单元的墩柱模型，主要采用增量动力分析方法对墩柱模型的地震响应特点进行了研究，非线性静力推倒法作部分对比分析，得出墩柱在不同地震波激励下的延性表现具有较大差异性，采用增量动力分析法评价墩柱位移延性能力较为精确。 由于实际桥梁结构墩柱的墩顶受到上部结构的一定程度约束作用，建立一个大跨连续刚构桥的弹塑性有限元模型。考虑到长周期地震波与普通地震波频谱特性的明显区别，因此对大跨连续钢构桥输入三条普通地震波和两条长周期地震波，分别分析了顺桥向和横桥向地震激励下，长周期地震波和普通地震波对墩柱延性行为的影响。 结果表明：连续刚构桥在顺桥向和横桥向长周期地震波激励下尽管加速度峰值比普通地震波低很多，结构就已进入相应的屈服状态和极限状态。顺桥向分别输入长周期地震波和普通地震波时，墩柱的延性表现有着明显的区别，而横桥向输入这些地震波时墩柱延性表现并无明显的差别。
[Abstract]:Under the influence of topography and geomorphology, many long-span bridges with high piers have to be built in the construction of highway and railway infrastructure in western China. These bridges belong to the typical irregular bridges, and there are no relevant seismic codes to be directly applied at present. The research on seismic ductility of this kind of bridges is few and far from the need of practical engineering. In order to analyze the ductility behavior of high pier under earthquake, this paper mainly does the following work: through OpenSees software, three pier column models based on elastoplastic fiber Liang Zhu element are established. The characteristics of seismic response of pier model are studied by means of incremental dynamic analysis method. The nonlinear static push-down method is used for partial comparative analysis. It is concluded that the ductility of pier column under different seismic wave excitation is quite different. The incremental dynamic analysis method is used to evaluate the displacement ductility of piers. Because the pier top of bridge structure is restrained by superstructure to some extent, an elastic-plastic finite element model of long-span continuous rigid frame bridge is established. Considering the obvious difference between long-period seismic waves and ordinary seismic waves, three ordinary seismic waves and two long-period seismic waves are input to long-span continuous steel bridges. The effect of long period seismic wave and ordinary seismic wave on ductility behavior of pier column. The results show that the structure of the continuous rigid frame bridge has entered the corresponding yield state and limit state even though the peak acceleration is much lower than that of the normal seismic wave under the excitation of long period seismic wave along the bridge and the transverse bridge. The ductility of the pier column is obviously different from that of the normal seismic wave when the long period seismic wave is inputted along the bridge direction, but there is no obvious difference in the ductility performance of the pier column when the seismic wave is input to the transverse bridge direction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
[Abstract]:Under the influence of topography and geomorphology, many long-span bridges with high piers have to be built in the construction of highway and railway infrastructure in western China. These bridges belong to the typical irregular bridges, and there are no relevant seismic codes to be directly applied at present. The research on seismic ductility of this kind of bridges is few and far from the need of practical engineering. In order to analyze the ductility behavior of high pier under earthquake, this paper mainly does the following work: through OpenSees software, three pier column models based on elastoplastic fiber Liang Zhu element are established. The characteristics of seismic response of pier model are studied by means of incremental dynamic analysis method. The nonlinear static push-down method is used for partial comparative analysis. It is concluded that the ductility of pier column under different seismic wave excitation is quite different. The incremental dynamic analysis method is used to evaluate the displacement ductility of piers. Because the pier top of bridge structure is restrained by superstructure to some extent, an elastic-plastic finite element model of long-span continuous rigid frame bridge is established. Considering the obvious difference between long-period seismic waves and ordinary seismic waves, three ordinary seismic waves and two long-period seismic waves are input to long-span continuous steel bridges. The effect of long period seismic wave and ordinary seismic wave on ductility behavior of pier column. The results show that the structure of the continuous rigid frame bridge has entered the corresponding yield state and limit state even though the peak acceleration is much lower than that of the normal seismic wave under the excitation of long period seismic wave along the bridge and the transverse bridge. The ductility of the pier column is obviously different from that of the normal seismic wave when the long period seismic wave is inputted along the bridge direction, but there is no obvious difference in the ductility performance of the pier column when the seismic wave is input to the transverse bridge direction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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