摘要
为研究锈蚀对构件疲劳寿命的影响,确保老钢桥的安全,以浙江路桥大修工程为依托,利用该桥报废的锈蚀钢构件进行疲劳试验,对试验数据进行分析找出锈蚀对疲劳影响的规律,并在试验数据基础上给出偏安全的评估建议曲线,以及相应的锈蚀钢构件疲劳寿命等级计算公式。结果表明:锈蚀失厚率越大,则疲劳寿命越低,且前者与后者的对数成负相关的关系;提出偏保守的疲劳寿命折减计算规则以及计算锈蚀构件等效疲劳细节的方法,由此根据Miner准则保守估计锈蚀构件的疲劳寿命。
In order to study the influence of corrosion on fatigue life of components and ensure the safety of old steel bridges, this paper introduces the fatigue tests on the discarded components from Zhejiang Rd. Bridge and following researches. The test data are analyzed to find out the corrosion effects on the fatigue life. An conservative curve and calculation formula for fatigue evaluation based on the test data are proposed. The results of the analysis indicate that the higher corrosion loss of thickness ratio is, the lower fatigue life will be. And the relationship between the former and the logarithm of latter is negative correlation. Conservative fatigue life reduction calculation rules and the method of calculating the equivalent fatigue details of corroded components is proposed. Finally, based on the Miner criterion, the fatigue life of corroded components is estimated.
作者
林照远
杨建喜
孙宝民
LIN Zhaoyuan;YANG Jianxi;SUN Baomin(Department of Bridge Engineering,Tongji University, Shanghai 200092, China;Shanghai Research Institute of Ship Technology,Shanghai 200032, China)
出处
《结构工程师》
北大核心
2018年第2期129-133,共5页
Structural Engineers
关键词
桁架桥
疲劳评估
锈蚀
失厚率
truss bridge
fatigue evaluation
Corrosion
thickness loss rate
