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为了准确预测高架桥轨道交通引起的环境振动,该文运用列车-轨道-桥梁耦合动力学理论及有限元建模的方法,建立了高架桥轨道交通引起的环境振动理论分析模型,模型包括振源和传播路径两大部分。振源模型由列车、轨道和桥梁组成,其中列车模型被模拟为带有多个车厢的体系,而每个车厢又是由弹簧-阻尼器连接车体、转向架和车轮所组成的多自由度体系,轨道模型采用Euler-Bernoulli梁模型,桥梁模型则为带弹簧支座的简支梁模型。三维的传播路径模型包括桥墩、基础结构和场地土,此部分模型由大型通用有限元程序Ansys建立。建立的高架桥轨道交通引起的环境振动理论分析模型较系统地反应了振动由产生到传播的整个过程,计算结果与北京地铁5号线的实测结果比较吻合。
In order to accurately predict environmental vibration caused by viaduct rail transit, a theoretical analysis model of environmental vibration caused by viaduct rail transit is established using the theory of train-track-bridge coupling dynamics and finite element modeling. The model includes vibration source and propagation Path two parts. The vibration source model is composed of trains, rails and bridges. The train model is modeled as a system with multiple cars, each of which is a multi-degree of freedom composed of a spring-damper connection body, bogie and wheels The Euler-Bernoulli beam model is used for the system and orbit model, while the bridge model is simply supported beam model with spring support. The three-dimensional propagation path model includes piers, infrastructures, and site soil. This part of the model was established by Ansys, a large, general-purpose finite element program. The theoretical analysis model of environmental vibration caused by viaduct rail transit has systematically reflected the whole process of vibration from generation to propagation. The calculation result is in good agreement with the measured results of Beijing Metro Line 5.