苏通长江大桥主梁断面三分力系数的雷诺数效应

以苏通长江大桥为研究背景，研发了一套测压装置，通过测压法对苏通长江大桥施工状态主梁断面三分力系数进行了现场实测研究，并把现场实测所得结果与风洞试验结果进行了对比，研究了雷诺数对三分力系数的影响。结果表明：雷诺数对阻力系数影响较大，现场实测值比风洞试验所得值小约15％，对升力系数及力矩系数影响较小。因此，针对特大桥梁，在利用风洞实验获取三分力系数时应尽量使雷诺数接近实际情况，否则结果可能偏于保守。

Reynolds number effect of mean force coefficients of bridge deck section of Su-tong Yangtze River Bridge

A set of pressure-measurement system was made and applied to measure the mean force coefficients of the prototype deck of Su-tong Yangtze River Bridge. The results were compared with those from wind tunnel test. Meanwhile, the Reynolds number effect of mean force coefficient was studied. The results showed that the drag coefficient was obviously affected by Reynolds number. The drag coefficient derived from filed measurement was 15 percent less than that of wind tunnel test. On the contrary Reynolds number has a minimal effect on lift force and moment coefficient. Therefore, for very large bridges, wind tunnel testing of mean force coefficients should be conducted at Reynolds number as large as to be close to the prototype case, otherwise the results may be conservative.