基于土-基础-桥墩相互作用的桥墩结构地震响应分析
发布时间：2019-01-02 10:11
【摘要】：本文研究了土-基础-桥墩结构相互作用影响下高墩的抗震性能,研究对象为钢筋混凝土矩形空心高墩,分析过程中运用数值模拟和理论分析相结合的方法建立了基于无限元边界的土-基础-桥墩相互作用数值模型,并对其进行参数化分析。运用有限元软件ABAQUS建立了基于土-基础-桥墩动力相互作用的高墩三维有限元模型,通过动力分析研究了El-Centro地震波作用下土-基础-桥墩相互作用效应对桥墩地震响应的影响规律,同时对比分析了采用人工截断边界及无限元边界时桥墩模型的地震响应,由此验证了采用无限元边界模拟土体边界的计算效率,在此基础上,采用一体化数值模型分析了随着桥墩结构自振周期的变化,土-基础-桥墩相互作用对桥梁地震响应的影响。结果表明,考虑土-基础-桥墩结构相互作用后,土体对地震波有一定的过滤作用,会导致桥梁的固有频率减小,加速度响应峰值和桥墩等效应力亦减小,位移出现增长趋势,会造成更加严重的地震破坏;采用基于无限元边界的土-基础-桥墩模型较人工截断边界模型的计算效率更高;考虑土-基础-桥墩相互作用会导致整个桥墩体系的刚度减小,从而使得桥墩加速度响应减小、位移响应增加;随着桥墩自振周期的延长,土-基础-桥墩相互作用对桥墩地震响应的影响越来越显著,当桥墩自振周期大于0.1秒时,应当考虑土-基础-桥墩相互作用的影响。
[Abstract]:In this paper, the seismic behavior of high pier under the influence of soil-foundation pier structure interaction is studied. The research object is reinforced concrete rectangular hollow high pier. In the process of analysis, a numerical model of soil-foundation pier interaction based on infinite element boundary is established by combining numerical simulation and theoretical analysis, and parameterized analysis is carried out. Using finite element software ABAQUS, a three-dimensional finite element model of high pier is established based on the dynamic interaction between soil, foundation and pier. Through dynamic analysis, the influence of soil-foundation pier interaction effect on pier seismic response under El-Centro seismic wave is studied. At the same time, the seismic response of pier model with artificial truncation boundary and infinite element boundary is compared and analyzed. The computational efficiency of using infinite element boundary to simulate soil boundary is verified. On this basis, the variation of natural vibration period with bridge pier structure is analyzed by using integrated numerical model. The effect of soil-foundation-pier interaction on bridge seismic response. The results show that considering the soil-foundation pier structure interaction, the soil can filter the seismic wave to a certain extent, which will result in the reduction of the natural frequency of the bridge, the peak acceleration response and the equivalent stress of the pier, and the increasing trend of the displacement. Will cause more serious earthquake damage; The calculation efficiency of the soil-foundation-pier model based on infinite element boundary is higher than that of artificial truncated boundary model. Considering the soil-foundation-pier interaction, the stiffness of the whole pier system will be reduced, and the acceleration response of the pier will be reduced and the displacement response will be increased. With the extension of the natural vibration period of pier, the influence of soil-foundation pier interaction on the pier seismic response is more and more obvious. When the pier natural vibration period is greater than 0.1 seconds, the influence of soil-foundation pier interaction should be considered.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55
本文编号：2398368
[Abstract]:In this paper, the seismic behavior of high pier under the influence of soil-foundation pier structure interaction is studied. The research object is reinforced concrete rectangular hollow high pier. In the process of analysis, a numerical model of soil-foundation pier interaction based on infinite element boundary is established by combining numerical simulation and theoretical analysis, and parameterized analysis is carried out. Using finite element software ABAQUS, a three-dimensional finite element model of high pier is established based on the dynamic interaction between soil, foundation and pier. Through dynamic analysis, the influence of soil-foundation pier interaction effect on pier seismic response under El-Centro seismic wave is studied. At the same time, the seismic response of pier model with artificial truncation boundary and infinite element boundary is compared and analyzed. The computational efficiency of using infinite element boundary to simulate soil boundary is verified. On this basis, the variation of natural vibration period with bridge pier structure is analyzed by using integrated numerical model. The effect of soil-foundation-pier interaction on bridge seismic response. The results show that considering the soil-foundation pier structure interaction, the soil can filter the seismic wave to a certain extent, which will result in the reduction of the natural frequency of the bridge, the peak acceleration response and the equivalent stress of the pier, and the increasing trend of the displacement. Will cause more serious earthquake damage; The calculation efficiency of the soil-foundation-pier model based on infinite element boundary is higher than that of artificial truncated boundary model. Considering the soil-foundation-pier interaction, the stiffness of the whole pier system will be reduced, and the acceleration response of the pier will be reduced and the displacement response will be increased. With the extension of the natural vibration period of pier, the influence of soil-foundation pier interaction on the pier seismic response is more and more obvious. When the pier natural vibration period is greater than 0.1 seconds, the influence of soil-foundation pier interaction should be considered.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55
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