剪跨比对高速铁路圆端形实心桥墩地震响应的影响

发布时间：2018-10-29 22:46

【摘要】：摘要：高速铁路桥梁作为生命线工程,一旦在地震中发生破坏,将会造成震后交通网络中断,加重次生灾害。根据大量震后桥梁破坏形式统计,桥梁震害的主要表现形式为桥墩破坏导致桥梁整体失效甚至倾覆倒塌。由此可见,桥墩构件的抗震性能影响着整个桥梁结构的抗震性能,研究桥墩构件的地震响应特性至关重要。目前国内外有关桥墩抗震性能的试验和理论研究大多以公路桥墩为原型,专门针对高速铁路圆端形桥墩的抗震研究很少,相关的振动台试验研究资料更是极度缺乏,因此亟需进行大量关于高速铁路桥墩的试验研究和理论分析。本文以目前高速铁路桥梁中常见的圆端形实心桥墩为原型,通过振动台试验进行抗震性能研究,并利用有限元软件对桥墩模型进行数值分析,具体研究内容如下： (1)按照相似原理,设计了高速铁路圆端形实心桥墩模型,对桥墩模型分别进行单向、多维地震破坏模拟的振动台试验,分析了桥墩在不同地震烈度下的动力特性、加速度响应、损伤破坏过程和裂缝发展规律。通过大型有限元分析软件ABAQUS,建立桥墩试件的精细仿真模型,将有限元分析结果和试验结果对比,相互验证有限元分析方法和试验方法的正确性。 (2)以模型桥墩为研究对象,应用ABAQUS有限元软件建立不同剪跨比下的桥墩三维实体模型,分别考虑水平地震和水平与竖向地震共同作用下,在不同地震烈度区桥墩构件的受力、变形状态以及整体抗震性能。通过对比深入分析剪跨比对桥墩抗震性能和损伤机理的影响。同时研究考虑竖向地震作用后桥墩构件的受力及变形状态的变化规律,分析各烈度区桥墩的地震反应,研究竖向地震对桥墩破坏模式和抗震性能的影响。 (3)通过对小剪跨比桥墩输入不同组合的水平双向地震荷载,分析其在不同荷载组合条件下的地震反应,研究地震组合效应对小剪跨比桥墩抗震性能的影响。
[Abstract]:Absrtact: as a lifeline project, the high-speed railway bridge will break down the traffic network and aggravate the secondary disaster once it is destroyed in the earthquake. According to the statistics of a large number of post-earthquake damage forms of bridges, the main form of bridge damage is the failure of bridge piers and the collapse of the whole bridge. It can be seen that the seismic behavior of pier members affects the seismic performance of the whole bridge structure, so it is very important to study the seismic response characteristics of pier members. At present, most of the experimental and theoretical studies on the seismic performance of piers at home and abroad are based on highway piers, but there are few seismic studies on circular end piers of high-speed railway, and the related experimental data of shaking table are extremely lacking. Therefore, a great deal of experimental research and theoretical analysis on high-speed railway piers are urgently needed. In this paper, the seismic behavior of round end solid pier, which is common in high-speed railway bridge, is studied by shaking table test, and the pier model is analyzed numerically by finite element software. The specific research contents are as follows: (1) according to the principle of similarity, the model of round end shaped solid pier of high-speed railway is designed, and the shaking table test of unidirectional and multidimensional seismic damage simulation is carried out on the model of bridge pier. The dynamic characteristics, acceleration response, damage failure process and crack development law of pier under different earthquake intensity are analyzed. The fine simulation model of the bridge pier specimen is established by the large-scale finite element analysis software ABAQUS,. The correctness of the finite element analysis method and the test method is verified by comparing the finite element analysis results with the test results. (2) taking the model pier as the research object, using the ABAQUS finite element software to establish the three-dimensional solid model of the pier under different shear span ratio, considering the horizontal earthquake and the horizontal and vertical earthquake together, respectively. Stress, deformation and overall seismic behavior of pier members in different seismic intensity areas. The effect of shear span ratio on seismic behavior and damage mechanism of pier is analyzed. At the same time, the variation law of the stress and deformation state of the pier members after considering the vertical earthquake is studied, and the seismic response of the pier in various intensity areas is analyzed, and the influence of the vertical earthquake on the failure mode and seismic performance of the pier is studied. (3) by inputting different combinations of horizontal and bidirectional seismic loads to small shear span ratio piers, the seismic response under different load combinations is analyzed, and the effect of seismic combination effect on the seismic behavior of small shear span ratio piers is studied.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.13;U442.55

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