基于Newmark积分法的预应力混凝土倒虹吸动力响应研究

Research on dynamic response of presterssed RC inverted siphon based on newmark method

结合南水北调中线工程南沙河倒虹吸结构,通过附加质量考虑管内水体和管壁的流固耦合作用,建立大型钢筋混凝土倒虹吸动力分析模型。输入按比例调整的Taft地震波,采用Newmark积分法及有限元技术,对不同过水工况下结构的动力响应进行研究。结果得出了控制截面的动应力和动位移的分布规律,可为同类工程设计提供参考。

Combined with Nan-sha river inverted siphon of Mid-route in South-to-North Water Transfer Project, a dynamic analysis model for the large RC inverted siphon is made.Additive mass method is applied to consider the fluid-structure interaction between the water and the wall. With the Taft wave adjusted in proportion, and Newmark integration method and FEM technique, the dynamic responses under different loading conditions are studied.The distribution laws of dynamic stress and displacement in control sections are given, which can provide reference for the design of similar projects.