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山区高等级公路桥梁建设中,由于地形变化较大,空心薄壁高墩占据很大的数量。针对此类桥墩的结构及受力特点,分别将其模拟成细长杆件和空间压板进行分析。运用Auto-CAD及大型有限元分析软件Sap 2000,采用不同的尺寸数据及断面形式,建立压杆有限元模型和空间压板有限元模型,描绘其稳定系数曲线,结合各力学理论知识研究单箱三室空心薄壁墩的压杆稳定与压板稳定的临界点,考察断面长宽比对单箱三室空心薄壁墩的稳定性的影响。
In the construction of mountain high-grade highway bridges, hollow thin-walled high-piers occupy a large amount due to the large changes in the terrain. According to the structure and force characteristics of such piers, they were simulated as slender rods and space plates respectively. Using the finite element analysis software Sap 2000 of Auto-CAD and different size data and cross-sectional forms, the finite element model of the pressure bar and the finite element model of the pressure plate are established, and the stability coefficient curve is depicted. Combining the theoretical knowledge of mechanics, Hollow thin-walled piers stability and pressure plate stability of the critical point to examine the aspect ratio of the single box three-chamber hollow thin-walled pier stability.