曲线斜拉桥的关键设计参数分析  

Analysis of Key Design Parameters of Curved Cable-stayed Bridge

作　　者：杜永超 DU Yongchao(Liaoning Provincial Transportation Planning and Design Institute Co.,Ltd.,Shenyang,Liaoning 110166,China)

机构地区：[1]辽宁省交通规划设计院有限责任公司,辽宁沈阳110166

出　　处：《黑龙江交通科技》2024年第7期102-105,111,共5页Communications Science and Technology Heilongjiang

摘　　要：曲线斜拉桥的结构体系复杂,设计难度大,如果设计参数不合理,会带来较大的安全隐患。为了提升曲线斜拉桥的设计质量,总结了曲线斜拉桥的基本特点,以S105国道的地锚式独塔曲线斜拉桥为分析对象,分析了其桥塔、主梁、斜拉索、结构体系的设计参数,并建立桥梁计算模型,分析了曲线半径对扭矩的影响、塔跨比对索力的影响及主梁在不同风速下的位移,研究成果表明:独塔曲线斜拉桥在设计时需设置辅助墩或密索体系,优先选择塔梁固结体系,曲线半径尽量控制在800 m以上。由于斜拉桥的塔跨比与索力呈线性负相关关系,为了防止索力过大,塔跨比不宜过小。当斜拉桥所在区域风速>40 m/s,其主梁位移大,需进行加固处理。The structural system of curved cable-stayed bridges is complex and the design difficulty is high.If the design parameters are unreasonable,it will bring significant safety hazards.In order to improve the design quality of curved cable-stayed bridges,the basic characteristics of curved cable-stayed bridges were summarized.The ground anchored single tower curved cable-stayed bridge of National Highway S105 was taken as the analysis object,and the design parameters of its tower,main beam,cable-stayed cable,and structural system were analyzed.A bridge calculation model was established,and the influence of curve radius on torque,tower span ratio on cable force,and displacement of the main beam under different wind speeds were analyzed.The research results showed that auxiliary piers or cable systems should be set up in the design of single tower curved cable-stayed bridges,and the tower beam consolidation system should be preferred.The curve radius should be controlled above 800 m as much as possible.Due to the linear negative correlation between the tower span ratio and cable tension of cable-stayed bridges,in order to prevent excessive cable tension,the tower span ratio should not be too small.When the wind speed in the area where the cable-stayed bridge is located is greater than 40 m/s,the main beam displacement is large and reinforcement treatment is required.

关 键 词：曲线斜拉桥 设计方案 设计参数 力学行为 抗风设计 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]