基于墩桩阻力的跨河桥梁阻水比计算分析

Calculation of Water Resistance Ratio of Crossing River Bridge Based on the Pier Resistance

从能量角度出发,定义跨河桥梁阻水比为桥墩对水流的阻力与河道过流能力的比值,并通过数值水槽,应用阻水比公式对单个桥墩和规则排列的双个桥墩进行了计算与分析。结果表明:公式可以量化放映跨河桥梁工程可通过采用流线型桥墩、减小桥墩轴线与水流的交角以及加大桥墩跨径等方式优化设计,达到减少桥梁阻挡、阻滞水流的影响,进而减轻对河道行洪安全的压力。

Based on the energy,the water resistance ratio is equal to the resistance of piers as the flow crossing to the channel flow capacity.The water resistance ratio was used to calculate and analyze the single pier and regular arrangement of two piers via numerical flume.By using streamlined pier,reducing the angle between the bridge pier axis and the flow,and increasing the pier span,this ratio can also effectively quantitative reflects the crossing bridge reduces the impact of the water resisting structure to resist and detain the water,and further lightens the pressure on the river safely flood.