Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m  

作　　者：Yejun DING Lin ZHAO Rong XIAN Gao LIU Haizhu XIAO Yaojun GE 

机构地区：[1]State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China [2]Key Laboratory of Transport Industry of Wind Resistant Technology for Bridge Structures,Tongji University,Shanghai 200092,China [3]Guangdong Highway Construction Co.,Ltd.,Guangzhou 510600,China [4]CCCC Highway Bridges National Engineering Research Center Co.,Ltd.,Beijing 100088,China [5]China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430056,China

出　　处：《Frontiers of Structural and Civil Engineering》2023年第10期1465-1476,共12页结构与土木工程前沿（英文版）

基　　金：support of National Key R&D Program of China(No.2022YFC3004105);National Natural Science Foundation of China(Grant Nos.52078383,52008314,52108469).

摘　　要：Aerodynamic instability owing to aerostatic and flutter-related failures is a significant concern in the wind-resistant design of long-span suspension bridges.Based on the dynamic characteristics of suspension bridges with spans ranging from 888 to 1991 m,we proposed fitted equations for increasing spans and base frequencies.Finite element models of suspension bridges with increasing span from 1000 to 5000 m were constructed.The structural parameters were optimized to follow the fitted tendencies.To analyze the aerodynamic instability,streamlined single-box section(SBS),lattice truss section(LTS),narrow slotted section(NSS),and wide slotted section(WSS)were considered.We performed three-dimensional(3-D)full-mode flutter analysis and nonlinear aerostatic instability analysis.The flutter critical wind speed continuously decreases with span growth,showing an unlimited approaching phenomenon.Regarding aerostatic instability,the instability wind speed decreases with span to approximately 3000 m,and increases when the span is in the range of 3000 to 5000 m.Minimum aerostatic instability wind speed with SBS or LTS girder would be lower than observed maximal gust wind speed,indicating the probability of aerostatic instability.This study proposes that suspension bridge with span approximately 3000 m should be focused on both aerostatic instability and flutter,and more aerodynamic configuration optimistic optimizations for flutter are essential for super long-span suspension bridges with spans longer than 3000 m.

关 键 词：suspension bridge super long-span finite element model aerodynamic instability aerodynamic configuration 

分 类 号：U44[建筑科学—桥梁与隧道工程]