渡槽槽体结构风载体形系数的风洞试验研究

Wind tunnel model test on shape coefficient of wind load for aqueduct

本文对于渡槽槽体结构模型进行了风洞实验研究 ,对于矩形渡槽槽体在均匀流场和具有 1 8%湍流度的湍流场中各取三种不同的高宽比进行了风洞试验 ,测量了在槽内有水和无水两种情况下槽体各个部位的风压系数 ,从而计算得出了渡槽结构风载体型系数 .从实验的初步的结果来看 ,渡槽结构风载体型系数同近年来我国编制的桥梁抗风设计指南中类似结构物的风载体型系数比较接近 ,但是同以往在渡槽抗风设计时所使用的参数有一定的差别 .本文中得出的渡槽槽体结构的风压分布和风载体型系数 ,为渡槽结构的抗风设计提供了参考依据 .

The wind pressure distributions and wind load shape coefficients of the rectangular aqueduct with different depth\|width ratio are studies in a wind tunnel. Two operation situations of the aqueduct including empty and full depth are considered. The flow field of the wind tunnel is uniform or turbulent flow with intensity 18%. The results show that the measured shape coefficients are significantly different from the traditional design parameters.