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首页> 外文期刊>Bulletin of earthquake engineering >Seismic fragility analysis of irregular bridges with non-circular tall piers considering ground motion directionality
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Seismic fragility analysis of irregular bridges with non-circular tall piers considering ground motion directionality

机译：考虑地面运动方向性的非圆形高墩的不规则桥梁的地震脆性分析

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摘要

To fully assess the seismic performance of irregular bridge structures with non-circular piers, a novel seismic fragility analysis method for bridge components is proposed accordingly. The method is proposed based on engineering structural reliability theory, and three independent limit state equations are adopted to represent three types of seismic damage, two of which are related to pier biaxial bending and shearing damage separately and the other is related to bearing deformation damage. The pier biaxial bending and shearing limit state equations are developed with reference to current well-established theory on the failure surfaces of reinforced concrete columns. The bearing deformation limit state equation is developed based on bearing's relative displacement. Each limit state equation is defined with 4 different limit states and the quantitative criteria on different limit states are also specified together. The seismic fragility analysis for the components of a certain irregular rigid-frame continuous combined bridge under the excitations of 3D ground motions is taken as a case study to thoroughly interpret the novel seismic fragility analysis method, and the impacts of incidence angles for horizontal ground motion on the component fragilities are discussed. It is shown that the proposed method is more appropriate in evaluating seismic performance of bridge components. In addition, the seismic vulnerability of the bridge structure system is also discussed by incorporating the first-order reliability theory.
机译：为了充分评估非圆形桥墩的不规则桥结构的地震性能，因此提出了一种用于桥部件的新型地震脆性分析方法。该方法是基于工程结构可靠性理论提出的，采用了三种独立的极限状态方程来表示三种类型的地震损伤，其中两个与墩双轴弯曲和剪切损坏分开有关，另一个与轴承变形损坏有关。墩双轴弯曲和剪切极限状态方程是参考钢筋混凝土柱的失效表面上的当前建立的理论开发。轴承变形极限状态方程是基于轴承的相对位移开发的。每个限制状态等式用4个不同的极限状态定义，并且还在一起指定不同限制状态的定量标准。在3D接地运动激发下，在3D接地运动的激发下，在3D接地运动的激发下的部件的地震脆性分析作为案例研究，以彻底解释新的地震脆弱性分析方法，以及横向地面运动的入射角的冲击讨论了组件磁带。结果表明，该方法更适合于评估桥部件的地震性能。此外，还通过结合着一阶可靠性理论讨论了桥梁结构系统的地震脆弱性。

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