大跨度悬索桥多对刚性中央扣受力性能研究  

STUDY ON STRESS PERFORMANCE OF MULTI-PAIR RIGID CENTRAL BUCKLE OF LONG-SPAN SUSPENSION BRIDGE

作　　者：陈祖贺 陈亮 邵长宇 CHEN Zu-he;CHEN Liang;SHAO Chang-yu(Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《工程力学》2024年第7期19-28,共10页Engineering Mechanics

基　　金：上海市政总院第五期启明星计划项目(K2021K117A)。

摘　　要：中央扣对改善大跨度悬索桥动力特性、短吊杆弯折、主梁纵向位移等具有显著作用,但现有文献少见对中央扣自身力学行为的研究。该文以中央扣为研究对象,通过力学方法推导了中央扣侧移刚度的计算公式,通过敏感性分析确认了杆身倾角α以及杆身轴向刚度j是影响中央扣侧移刚度的主要因素;对设置多对刚性中央扣的情况进行了研究,因主缆与中央扣杆身轴向刚度相差不大,主缆对多对中央扣协调受力影响较大,中央扣与主缆组成串、并联弹簧体系,受力分配更加复杂,可通过调整杆身倾角及杆身轴向刚度,设置具有不同侧移刚度的多对中央扣以实现协调受力。The central buckle plays a significant role in improving the dynamic characteristics,short suspender bending and the main beam longitudinal displacement of long-span suspension bridge.However,there are few studies on the stress performance of the central buckle.The central buckle is studied and the formula for calculating its lateral stiffness is derived by the mechanical method.Through the sensitivity analysis,it is confirmed that the inclination angle and the axial stiffness of the rod body are the main factors affecting the lateral stiffness of the central buckle.Multiple rigid central buckles is studied,in which the main cable axial stiffness is not significantly different from that of the central buckle,and thus the main cable has a great influence on the central buckle internal force.The central buckle and the main cable form a series-parallel spring system,and the force distribution is more complex.By adjusting the inclination and axial stiffness of the rod body,multiple pairs of central buckles with different lateral stiffness are set to achieve coordinated stress.

关 键 词：悬索桥 刚性中央扣 多对 倾角 轴向刚度 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]