润扬大桥北锚基础有限元分析与安全监控系统研究

North Anchor Foundation Monitoring of Runyang Suspended Bridge Based on Finite Element Analysis

为对润扬大桥北锚碇地基基础进行运营期安全监控,针对其运营期存在的安全问题,建立了三维非线性有限元计算模型,利用该模型对北锚碇在荷载作用下的响应进行了分析。在分析结果的基础上确定了北锚碇变形监控的重点区域作为安排测点的依据,建立了安全监控模型作为北锚地基基础出现异常的报警判据,此外还确定了反演分析的重点力学参数等便于对异常情况出现的成因进行分析。研究表明,在监控模型中采用二次以下多项式函数拟合索力与响应的关系进行预测是可行的。

To monitor the safety of the north anchor foundation of Runyang suspended bridge during the working period, the load process exerted on the foundation is simulated by using nonlinear FEM. The internal stress, deformation of soil and shoring structure are calculated. This method is good in simulating construction process of deep foundation excavation and shoring thereof. The results indicate that it is practical to build monitoring model with fitted function between cable force and response as quadratic polynomial or linear polynomial.