影响四塔三跨悬索桥结构刚度的因素分析  

ANALYSIS OF FACTORS AFFECTING THE STIFFNESS OF A FOUR TOWER THREE SPAN SUSPENSION BRIDGE STRUCTURE

作　　者：王宝喜 Wang Bao-xi

机构地区：[1]四川省公路规划勘察设计研究院有限公司,成都610041

出　　处：《建筑技术开发》2024年第8期114-116,共3页Building Technology Development

摘　　要：为研究结构设计参数对四塔三跨悬索桥结构刚度的影响,以边塔高度、主缆垂跨比、桥塔刚度为变量,研究了不同参数下结构的刚度特性。研究表明:增大边塔高度对结构刚度和整体受力影响不大。索塔高度不同时,竖向基频、一阶对称扭转基频及反对称扭转基频基本一致,结构跨中挠度也基本相同且有增大趋势。主缆垂跨比是悬索桥设计中的一项重要指标,减小垂跨比可以增加全桥的刚度。可变荷载作用下,主缆截面面积对主梁竖向挠度有较大影响。In order to study the influence of structural design parameters on the stiffness of a four tower three span suspension bridge,the stiffness characteristics of the structure were studied under different parameters,with the height of the side tower,the vertical span ratio of the main cable,and the stiffness of the bridge tower as variables.Research has shown that increasing the height of the side tower has little effect on the structural stiffness and overall stress.When the tower height is different,the vertical fundamental frequency,first-order symmetric torsional fundamental frequency,and antisymmetric torsional fundamental frequency are basically the same,and the mid span deflection of the structure is also basically the same and shows an increasing trend.The vertical span ratio of the main cable is an important indicator in the design of suspension bridges,and reducing the vertical span ratio can increase the stiffness of the entire bridge.Under live load,the cross-sectional area of the main cable has a significant impact on the vertical deflection of the main beam.

关 键 词：四塔三跨悬索桥 刚度 边垂跨比 

分 类 号：U312.1[交通运输工程]