摘要
深圳市光明新区大顶岭绿道人行悬桥跨径布置为(63.8+24.2)m,采用Q690D预拉力高强度钢板带作为主要承重结构,主、边跨支点采用钢斜撑支承。采用有限元法对该桥整体静动力特性、索板转换器受力以及钢板带与钢斜撑的接触应力进行分析;采用CFD数值模拟和风洞试验对该桥抗风性能进行分析。结果表明:各构件强度及疲劳强度均满足要求;钢斜撑顶部的钢板带接触应力可忽略,钢板带曲线设置合理,满足钢斜撑两侧钢板带平顺转向的功能;风铃装置可提高结构气动稳定性,结构颤振临界风速高于颤振验算风速且没有发生涡激共振。采用在桥面上方布置5 t缆索起重机、在桥面下方设置可拆卸支撑胎架相结合的方案分段吊装钢板带,另布置1台25 t汽车吊用于索板转换器和钢斜撑构件吊装。
The footbridge carrying a section of the Dadingling Greenway in Guangming District of Shenzhen is designed as a stress-ribbon structure,which features its single oblique support that divides the structure into two spans of 63.8 and 24.2 m.The Q690D high-strength steel stress-ribbons with pre-tensile froce are the primary load carrying components.The finite element method was used to analyze the global static and dynamic properties of the footbridge,the mechanical property of the cable-plate converter and the contact stress between the steel stress-ribbons and the oblique steel support.CFD numerical simulation and wind tunnel tests were performed to analyze the wind-resistant performance of the bridge.The results show that the strength and fatigue performance of the components can meet the relevant requirements,the contact stresses between the oblique steel support and the steel stress-ribbons are negligible,and the catenaries of the steel stress-ribbons are rational,enabling the smooth rotation of steel plates on the two sides of the oblique steel support.Wind bells can improve the aerodynamic stability of the structure,the flutter critical wind velocity is higher than the wind velocity of flutter check calculation,and no vortex-induced vibrations were observed.During the construction,a 5 t-capacity cableway crane was used to hoist the segments of the stress ribbons that were mounted on the detachable supporting frame.And a 25 t-capacity mobile crane was employed for the installation of the cable-plate converter and oblique steel support.
作者
董华
张义
曹鸿猷
DONG Hua;ZHANG Yi;CAO Hong-you(China Construction Third Bureau First Engineering Co. ,Ltd. ,Wuhan 430040,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《世界桥梁》
北大核心
2022年第4期68-74,共7页
World Bridges
基金
国家自然科学基金项目(51708436)。
关键词
人行桥
高强钢板带
钢斜撑
索板转换器
静动力特性
接触应力
抗风性能
施工技术
footbridge
stress-ribbon formed of high-strength steel plate
oblique steel support
cable-plate converter
static and dynamic property
contact stress
wind resistance
construction technique
作者简介
董华(1984-),男,高级工程师,2009年毕业于长江大学土木工程专业,工学学士,2012年毕业于太原理工大学结构工程专业,工学硕士(E-mail:donghua606@163.com);通信作者:张义(1970-),男,高级工程师(E-mail:yizhang3297@163.com)。研究方向:钢结构设计施工。
