大跨径悬索桥钢梁疲劳设计研究  

Study of Fatigue Design for Steel Girder of Long-Span Suspension Bridg

作　　者：刘榕[1] 王甜[1] 

机构地区：[1]湖南省交通规划勘察设计院,湖南长沙410008

出　　处：《公路工程》2013年第2期103-107,共5页Highway Engineering

摘　　要：大跨径悬索桥钢梁疲劳已逐渐成为钢桥主要病害之一,通过对疲劳与断裂的分析,使设计者对清楚了解疲劳寿命的主要组成部分。由于断裂力学在裂纹萌生阶段的分析理论仍不成熟,钢桥设计仍采用S-N曲线和Miner线性法则进行无限寿命设计和安全寿命设计。新版国内钢结构桥梁设计规范尚未颁布,分别采用BS5400、AASHTO、Eurocode3及《公路桥涵钢结构及土木结构设计规范》(JTJ 025-86)对某大跨悬索桥钢梁不同结构部分进行详细介绍,使设计者了解不同归规范中的相关规定,并对大跨悬索桥钢梁疲劳设计提出有益探讨。Fatigue of steel girder has become the main disease in long span suspension bridge. Through analysis the relationship between fatigue and fracture, it makes the designers clearly understand the components of fatigue life. Due to the theory of fracture mechanics analysis of crack initiation phase is still immature, Steel bridge design is still using the S-N curve and the Miner linear rule for infinite life de- sign and safe life design. For the new edition of domestic steel bridge code has not been released,a steel girder of a long span suspension bridge is analysised in detail by other codes,includes BS5400, AASH- TO, Eurocode3 and JTJ025-86. This paper makes designers understand the relevant provisions of these codes, and put forward some beneficial discussions of fatigue design.

关 键 词：悬索桥 钢梁 断裂疲劳 疲劳设计 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]