温度对空心薄壁高墩稳定性影响研究

以内蒙古G209线贾家湾大桥空心薄壁高墩为例,采用大型有限元软件MIDAS建立了有限元模型,并对其进行了4种不同温度工况下的线弹性和几何非线性稳定性分析,得到了考虑几何非线性影响的稳定性分析结果比线弹性情况低,且同一温度荷载作用下高墩的顺桥向较横桥向更容易失稳,故施工中有必要增加贾家湾大桥顺桥向的刚度。

Research on the Stability of Hollow Thin-wall High Pier Under the Influence of Temperature

Taking the hollow thin-wall high pier of Jiajiawan bridge at G209 line in Inner Mongolia as an example, the finite element model by using the large software MIDAS is established, the stability analysis under 4 different temperature load conditions is carried on, the results show that the geomet- ric nonlinear stability analysis results was lower than the linear condition, and, the pier along the bridge was easier to lose stability than transverse to the bridge under the same temperature load, so it is necessary to increase the stiffness along the bridge in the construction of Jiajiawan bridge.