数值模拟技术在桥梁桥墩布置及跨度选择中的应用

Application of numerical simulation technology in bridge pier layout and spanselection

桥区河段水沙条件复杂,桥梁桥墩布置和桥梁跨度的选择会对主航槽演变、通航条件以及项目总投资造成一定的影响。利用数值模拟技术深入分析建桥前后桥区河段水流条件,找出经济、合理的桥墩布置和桥梁跨度。分析表明:1)桥墩布置时应尽可能满足河床与航道变迁,不形成碍航和通航控制河段。2)桥梁跨度净宽应满足通航净宽和船舶通过能力等的要求。

The water and sediment conditions in the river section of the bridge area are complex,and the choice of bridge pier layout and bridge span affects the evolution of the main navigation channel,navigation conditions,and the total investment in the project.This study employs numerical simulation technology to deeply analyze the water flow conditions in the bridge area before and after the construction of the bridge and determine an economical and reasonable bridge pier layout and bridge span.The analysis comes down to the following two observations:1)The bridge pier layout should suit the changes in the riverbed and the channel as much as possible,thereby preventing the formation of a river section obstructing or restricting navigation.2)The clear width of the bridge span should meet the requirements of navigation clear width and traffic capacity.