摘要
以在建主跨为1 080 m的三塔双跨悬索桥——泰州长江公路大桥为工程背景,采用三维非线性空气动力稳定性分析方法,分析主缆矢跨比、加劲梁恒载集度、加劲梁支承方式、中塔型式、缆索体系等结构参数对三塔悬索桥空气动力稳定性的影响,并探讨了具有良好抗风稳定性的三塔悬索桥的结构布置形式。结果表明：三塔悬索桥主缆的矢跨比在1/10~1/11范围内,主梁跨中设置刚性中央扣,增强中间桥塔的纵桥向刚度以及采用空间缆索体系或平面双缆体系时,可以获得较好的空气动力稳定性。
By taking a three-tower suspension bridge—Taizhou Highway Bridge over Yangtze River with main span of 1 080 m as example,effects of structural parameters including the sag to span ratio,the girder s dead load,the girder s supporting system,structural configuration of the center tower and the cable system on the aerodynamic stability of three-tower suspension bridges are investigated numerically by 3D nonlinear aerodynamic stability analysis,the favourable structural system of three-tower suspension bridges with good wind stability is discussed. The results show that good aerodynamic stability can be ob- tained for three-tower suspension bridges as the sag to span ratio is assumed ranging from 1/10 to 1/11, the rigid connections are given between main cables and the girder at midpoint of main spans, longitudinal stiffness of the center tower is increased, and the spatial cable system or double cable system is employed.
出处
《公路》
北大核心
2009年第12期6-10,共5页
Highway
关键词
三塔悬索桥
结构参数
空气动力稳定性
three-tower suspension bridge
structural parameters
aerodynamic stability
