摘要
以主梁由桁片间距为14m的3片主桁组成的安庆铁路长江大桥为工程背景,利用自行研制的可在风洞中测量非正交风作用下桥梁气动力系数的特殊试验装置,通过节段模型风洞试验,研究安庆铁路长江大桥主桁梁在非正交风作用下的静气动力系数,并进行利用该装置与传统装置所得试验结果的对比。结果表明:主桁梁的气动力系数最大值发生在有一定偏角的非正交风作用时,而且横桥向阻力系数和升力系数均关于横桥向坐标轴对称;横桥向阻力系数最大值出现在来流风与横桥向成10°时,其约为横向来流风时阻力系数的1.09倍;顺桥向阻力系数关于横桥向坐标轴反对称,且在来流风与横桥向成55°左右时达到最大,为0.108 6;非正交风作用下的顺桥向最大风荷载约为正交风作用下横桥向风荷载的64%左右。
Anqing Changjiang River railway bridge was taken as the engineering background,whose main girder was composed of 3 main trusses with the spacing of 14 m.Special test equipment was selfdeveloped,which could be used to measure the aerodynamic coefficient of bridge under non-orthogonal wind in wind tunnel.The static aerodynamic coefficients of the main truss of Anqing Changjiang River railway bridge under non-orthogonal wind were studied by section model wind tunnel test.The test results acquired by traditional equipment and special equipment were comparatively analyzed.Results show that the maximum aerodynamic coefficient of main truss beam occurs under non-orthogonal wind with certain yawed angle.Moreover,both the drag coefficient and lift coefficient in the transverse direction of bridge are symmetrical about the axis in the transverse direction of bridge.The maximum drag coefficient in the transverse direction of bridge appears with the angle of 10°between inflow wind and the transverse direction of bridge,which is about 1.09 times of the drag coefficient under transverse inflow wind.The drag coefficient along the longitudinal direction of bridge is antisymmetrical about the axis in the transverse direction of bridge,and the maximum is 0.108 6which appears with the angle of 55°between inflow wind and the transverse direction of bridge.The maximum wind load in the longitudinal direction of bridge under nonorthogonal wind is about 64% of that in the transverse direction of bridge under orthogonal wind.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2016年第6期21-26,共6页
China Railway Science
基金
国家自然科学基金资助项目(51378443)
铁道部科技研究开发计划项目(2013G001-A)
关键词
桁梁桥
静气动力系数
非正交风
风洞试验
风荷载
大跨度桥
钢桥
Truss bridge
Static aerodynamic coefficient
Non-orthogonal wind
Wind tunnel test
Wind load
Long span bridge
Steel bridge
