江阴长江大桥钢箱梁疲劳应力特征分析

发布时间：2018-03-01 23:03

本文关键词： 悬索桥钢箱梁裂缝应变监测应变时程应力谱疲劳损伤度疲劳寿命　出处：《世界桥梁》2016年02期 　论文类型：期刊论文

【摘要】：为准确评估钢桥结构的疲劳损伤状态和剩余疲劳寿命,以江阴长江大桥为背景,对该桥钢箱梁疲劳裂纹产生位置进行连续疲劳应变监测,获取应变时程数据,结合雨流计数法技术建立日疲劳应力谱;分析应力幅~循环次数分布规律;研究累积损伤度分布特征,建立损伤度分布模型,计算不同车道构造细节疲劳损伤度和剩余寿命。研究结果表明:钢箱梁顶板测点、U肋与横隔板焊接末端处、弧形缺口有效截面最小处均以压应力为主,U肋以拉应力为主;应力幅累积循环次数分布服从Weibull函数分布;疲劳累积损伤度分布服从Boltzman函数分布,顶板与U肋连接处U肋腹板沿横桥向慢车道疲劳损伤较快车道损伤大,下游车道较上游车道损伤大,其中下游慢车道U肋腹板细节疲劳损伤最大。
[Abstract]:For an accurate assessment of the fatigue damage and fatigue life of steel structure in Jiangyin, Yangtze River bridge as the background, location for continuous monitoring of fatigue crack fatigue strain of steel box girder of the bridge, the data acquisition process of strain, the rain flow count method based on fatigue stress spectrum analysis; stress amplitude distribution of ~ cycles; the cumulative damage degree distribution, a damage degree distribution model, the calculation of different lane structure detail fatigue damage degree and residual life. The results show that: the steel box girder roof station, U rib to diaphragm at the end of welding, arc gap effective cross section minimum were characterized by compressive stress, tensile stress of U rib to be; stress amplitude cumulative cycle distribution obeys the Weibull distribution function; fatigue cumulative damage degree distribution follows Boltzman distribution function, the roof is connected with the U rib U rib web along the transverse direction of the bridge fatigue damage is the slow lane The damage of the fast lane is large and the downstream lane is more damaged than the upstream lane, and the fatigue damage of the U rib web in the lower reaches of the lower reaches is the greatest.

【作者单位】：河海大学土木与交通学院;江苏扬子大桥股份有限公司;
【基金】：国家自然科学基金项目(51278166、51478163) 江苏省交通科学研究计划项目(2013Y10-1、2014Y02)
【分类号】：U441

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