摘要
为分析中外规范对钢-UHPC组合桥面疲劳评估的适用性,以武汉军山长江大桥加固改造工程为背景,分别利用美国规范AASHTO LRFD Bridge Design Specifications、欧洲规范Eurocode 3:Design of Steel Structures(BS EN 1993-1-9:2005)、日本规范《道路桥示方书·同解说(钢桥篇)》和中国规范《公路钢结构桥梁设计规范》(JTG D64—2015)评估该桥正交异性钢桥面板经UHPC铺装层加固后的疲劳性能和剩余寿命。采用Abaqus软件建立钢-UHPC组合桥面节段模型,采用中外规范的标准疲劳车加载,计算各疲劳细节处的应力幅值,并对比分析各疲劳细节处的应力水平;同时对运营状态下各疲劳细节处开展连续动应变监测,获取各疲劳细节处实测应力时程,对钢桥面板进行疲劳寿命评估。结果表明:美国规范更适用于重车比例较高的桥梁,欧洲规范更适用于桥面板较厚的桥梁,日本规范更适用于桥面宽度较小的桥梁,中国规范均可适用。当横隔板弧形切口应力水平较高时,美国规范疲劳评估结果的安全性不佳;在桥面板纵肋对接焊缝处,美国规范和日本规范的常幅疲劳极限值较欧洲规范分别低19.0%和22.2%,较中国规范分别低18.8%和22.0%;当桥面板纵肋对接焊缝应力幅为46~59 MPa时,采用美国规范和日本规范进行评估的结果更安全。除横隔板弧形切口和纵肋对接焊缝外的其余疲劳细节,中外规范给出的常幅疲劳极限值比较接近,评估结果均为无限寿命。
The orthotropic steel deck of Junshan Changjiang River Bridge in Wuhan has been retrofitted and paved with a UHPC layer.In this paper,the methods to evaluate the fatigue property and residual life of the steel-UHPC composite deck given in multiple specifications are compared,including the AASHTO LRFD Bridge Design Specifications(referred to as AASHTO LRFD hereafter),Eurocode 3:Design of steel Structures(Eurocode 3 for short),Japan′s Road Bridges Specification:Part 2-Steel Bridges(the Japanese specification for short)and China′s Specifications for Design of Highway Steel Bridge(JTG D64-2015,the Chinese specification for short).Numerical segmental models of the steel-UHPC composite deck developed in Abaqus were loaded with loading vehicles required in these specifications to calculate the stress ranges of selected fatigue details,and compare and analyze the stress levels at the fatigue details.Meanwhile,continuous dynamic strain monitoring was conducted when the bridge was in service state,to obtain the measured stress time history at these fatigue details,so as to evaluate the fatigue life of the steel deck.As per the analysis,it is better to consult AASHTO LRFD in evaluating the fatigue life of bridges serving higher volume of heavy vehicles,Eurocode 3 for bridges with thicker deck plates,Japanese sepcification for relatively narrow bridges,and Chinese specification can be consulted in all these mentioned conditions.When the stresses in the arc cut-outs in the diaphragms reach high levels,the fatigue life evaluated consulting AASHTO LRFD is of low precision.For the constant-amplitude fatigue limits at the butt joints between deck plate and longitudinal ribs calculated consulting the AASHTO LRFD are 19.0%lower than the Japanese specification and 22.2%lower than Eurocode 3.While the constant-amplitude fatigue limits calculated consulting the AASHTO LRFD and the Japanese specification are 18.8%and 22.0% lower than that calculated consulting the Chinese specification,respectively.When the stresses in the butt joints between the steel deck plate and longitudinal ribs are within the range of 46 to 59 MPa,it is proper to consult AASHTO LRFD and the Japanese specification for evaluation.For the fatigue details besides the arc cut-outs in diaphragms and butt joints between the steel deck plate and longitudinal ribs,the fatigue evaluations consulting all the four different specifications are approximate,indicating an infinite fatigue life.
作者
高立强
余丽辉
王康宁
张佳斌
秦世强
GAO Liqiang;YU Lihui;WANG Kangning;ZHANG Jiabin;QIN Shiqiang(State Key Laboratory of Bridge Intelligent and Green Construction,Wuhan 430034,China;China Railway Bridge Science Research Institute Co.,Ltd.,Wuhan 430034,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第5期74-82,共9页
Bridge Construction
基金
桥梁结构健康与安全国家重点实验室开放课题(BHSKL20-08-GF)。
关键词
桥梁工程
正交异性钢桥面板
钢-UHPC组合桥面
中外规范
疲劳评估方法
疲劳性能
疲劳寿命
应力监测
bridge engineering
orthotropic steel deck
steel-UHPC composite deck
Chinese and foreign specification
fatigue evaluation method
fatigue performance
fatigue life
stress monitoring
作者简介
高立强,高级工程师,E-mail:gaoliqiang1984@126.com。研究方向:桥梁与结构工程。
