升降温工况下海底沉管隧道接头抗震性能研究

Research on the Influence of Temperature Rise and Fall to the Seismic Performance of Immersed Tunnel Joint

以国内某跨海交通工程中海底沉管隧道段为工程背景,基于反应位移法基本原理建立了考虑接头弹簧刚度和土弹簧刚度影响的纵向梁-弹簧有限元模型。在非一致地震激励下,考察升降温工况对沉管隧道接头刚度的改变及由此引起的管节接头处张开量的变化,以此判断升降温工况对沉管隧道抗震性能的影响。研究表明,升温工况下管节接头的张开量减小,对结构的抗震是有利的;而降温工况下管节接头的张开量增大,对结构抗震是不利的。

According to the large-scale undersea immersed tunnel of the Dalian Bay Bridge, the longitudinal spring and beam two-dimensional FEM model that has considered the influence of joint spring and soil spring is built based on the Response Displacement Method. The change of temperature to joint spring stiffness and joint opening are researched to estimate the influence of temperature on the seismic performance of immersed tunnel using the Multi-point incongruent earthquake excitation method. The research shows that the opening volume of the pipe joints is decreased when the temperature is increased that is favorable to the seismic performance and the opening volume of the pipe joints is increased when the temperature is decreased that is unfavorable to the seismic performance.