摘要
通过香港昂船洲大桥拉索风阻系数风洞试验研究,得到了各工况下不同直径及不同的表面形式拉索的阻力系数值,并对大跨度斜拉桥拉索的阻力系数特性进行了研究。结果表明:来流方向从顺桥向往横桥向变化时,阻力系数逐渐增大;来流方向沿纵桥向时,拉索倾角对阻力系数影响较大,风速对其影响较小;阻力系数随表面粗糙度的增加而增大,横桥向时表现更加明显,并且螺旋线表面阻力系数大于压花表面阻力系数;螺旋线表面拉索阻力系数受风速影响较小,压花表面阻力系数随风速的增大而增大;对比试验值与我国现行规范取值,规范取值偏于保守。
Based on the wind tunnel test of the cables resistance coefficient of Stonecutters Bridge, the paper analyzes the change law of drag coefficients by various influence factors. We get the result of cables resistance coefficient in different working condition, different diameter and different superficial form. The investigation shows that the drag coefficients corresponding to wind along the bridge line are usually lower in one order in quantity than those corresponding to wind perpendicular to the bridge line. The wind direction angles have a great influence on the drag coefficients when the wind along the bridge line. For the stay cable surface,if the helical fillet or dimpled pattern is adopted, the roughness of the surface could be increased and thus the aerodynamic property could be improved, the roughness of the surface could be increased and thus the aerodynamic property could be improved. However,once the roughness is improved,the drag coefficients will be increased a lot and the variation is relatively stable. The test results are Smaller than the national regulations, it show that national regulation is more conservative.
出处
《四川建筑科学研究》
2014年第3期1-4,共4页
Sichuan Building Science
基金
国家自然科学基金(51278433)
关键词
大跨度斜拉桥
阻力系数
风洞试验
long-span cable-stayed bridge
drag coefficient
wind tunnel test
