S型曲线梁桥径向位移的有限元分析

Finite Element Analysis on Radial Displacement of S-type Curved-beam Bridge

通过对吉林省S型曲线梁桥进行走访调查及检查,结合某高速公路S形曲线梁桥长期健康监测工程项目,应用有限元分析软件Midas/Civil分析不同线形和支承形式下曲线梁桥的平面变形影响因素,结果表明:均匀温度作用、梯度温度作用都会对曲线梁桥的径向位移产生影响,且曲率半径越小,影响越大。梯度温度作用是曲线梁桥内外侧产生翻转的主要原因。均匀温度作用是曲线梁桥产生径向位移的主要原因之一,在进行曲线梁桥建设时,应将竣工时间控制在气温与当地年均温度相近的时间里。

According to the field investigation and inspection of the S-type curved-beam bridges in Jilin Province and combined with the long-term health monitoring engineering project of the S-type curved-beam bridges in an expressway, the finite element analysis software Midas/Civil is used to analyze the plane deformation influence of curved-beam bridges of the different alignments and supporting forms. The result shows that the uniform temperature effect and gradient temperature effect will all cause the influence on the radial displacement of curved-beam bridge, and the smaller the radius of curvature is, the larger the influence is. The gradient temperature effect is the main reason to cause the overturn of the inside and the outside of curved-beam bridge. The uniform temperature effect is one of the main reasons to cause the radial displacement of curved-beam bridge. The completion time of the curved-beam bridge during the construction should be controlled within the time of the temperature closing to the local annual average temperature.