基于桥墩地震破坏模式的滞回性能模拟

发布时间：2018-06-05 15:28

本文选题：钢筋混凝土柱 + 抗震性能　；参考：《大连理工大学》2015年硕士论文

【摘要】：钢筋混凝土桥墩在地震作用下极易发生破坏,且不同破坏模式表现出的抗震性能也不同。开展钢筋混凝土桥墩地震破坏模式和滞回性能数值模拟的研究,是揭示桥梁地震破坏机理、认识桥梁抗震能力的前提和保证。本文在对比现有的桥墩破坏模式判别方法的基础上,建立了不同破坏模式下桥墩滞回性能模拟。本文的主要工作如下：1.根据美国太平洋地震研究中心钢筋混凝土桥墩抗震性能试验数据库,选取了共计56根的弯曲破坏、弯剪破坏、剪切破坏实验柱。基于这些试验数据,对刘鸣、Zhu、马颖三人提出的钢筋混凝土桥墩破坏模式判别方法进行了判错率对比分析,结果表明,zhu提出的两区域划分法最适合用来预判钢筋混凝土柱的破坏模式。2.基于两区域划分法,建立了不同破坏模式下桥墩的数值分析模型。针对落在F区域的桥墩建立了考虑弯曲效应和纵筋拔出效应的数值分析模型,针对落在S区域的桥墩建立了考虑弯曲效应、剪切效应及拔出效应的数值分析模型。分别通过6根弯曲破坏、6根剪切破坏、6根弯剪破坏试验柱对模型进行了验证。3.针对空心墩破坏模式判别非常困难这一特点,基于孙治国等提出的矩形空心墩抗震变形能力的统一计算公式,通过Opensees分析平台中提供的极限状态材料模型实现这一公式,在此基础上建立了不同破坏模式下的矩形空心墩统一计算模型。模型中以空心墩变形能力统一计算公式定义试件严重破坏阶段的起始时刻位移,由此考虑桥墩由于剪切或弯曲破坏引起的承载力和刚度退化行为。最终通过7个不同破坏形态矩形空心墩柱对滞回分析模型进行了验证。
[Abstract]:Reinforced concrete pier is prone to damage under earthquake, and the seismic behavior of different failure modes is different. The study of seismic failure mode and hysteretic behavior of reinforced concrete pier is the premise and guarantee to reveal the seismic failure mechanism of bridge and to understand the seismic capacity of bridge. In this paper, based on the comparison of existing bridge pier failure modes, simulation of pier hysteretic performance under different failure modes is established. The main work of this paper is as follows: 1. According to the seismic performance test database of reinforced concrete pier of Pacific Seismic Research Center, 56 experimental columns of bending failure, flexural shear failure and shear failure were selected. On the basis of these experimental data, a comparative analysis of the fault rate of reinforced concrete pier failure mode proposed by Liu Ming, Zhu and Ma Ying was made. The results show that the two-zone partition method proposed by Chen Zhu is the most suitable for predicting the failure mode of reinforced concrete columns. Based on the two-region partition method, a numerical analysis model of bridge pier under different failure modes is established. A numerical analysis model considering bending effect and longitudinal rib pull-out effect is established for pier falling in F region, and a numerical analysis model considering bending effect, shear effect and pull-out effect is established for pier falling in S region. The model was verified by 6 bending failure and 6 shear failure test columns. In view of the fact that it is very difficult to distinguish the failure modes of hollow piers, based on the unified formula of seismic deformation capacity of rectangular hollow piers put forward by Sun Zhiguo et al, this formula is realized through the material model of limit state provided in the Opensees analysis platform. On this basis, the unified calculation model of rectangular hollow pier under different failure modes is established. In the model, the deformation capacity of hollow pier is used to define the initial moment displacement of the specimen in the serious failure stage, and the bearing capacity and stiffness degradation behavior of the pier due to shear or bending failure is considered. Finally, the hysteretic analysis model was validated by 7 rectangular hollow columns with different failure patterns.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.22

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