框架箱涵的力学特性研究及参数分析

Mechanical Characteristics Study and Parameter Analysis of the Reinforced Concrete Frame Box Culvert

框架箱涵作为一种常见的地下空间结构形式,其受力影响因素较为复杂。在较大的斜交角度存在的情况下,常规的平面简化模型不再适用,给设计带来不安全因素。采用有限元计算软件Midas建立板壳模型和杆系模型,对不同情况下的箱涵进行计算,对结果进行详细对比,对比结果显示斜交角度、地基条件、箱室尺寸布置对结构内力影响较大。最后通过分析造成现象的原因和总结各参数对内力影响的变化规律,为结构选型和设计提供参考依据。

Reinforced concrete frame box culverts are widely used in underground structures. At big skew an-gles, the normally used 2D simplified computational models for the reinforced concrete frame box culverts are not suitable. Using the finite element software Midas, the frame culvert was modelled by plate elements and beam elements under different conditions. Comparisons were made between the simplified method and the fi-nite element modeling. The result shows that some design parameters, such as skew angle, base coefficient and box width, have great influence on structural internal forces. The effects were analyzed for future project reference.