摘要
为了研究正交异性桥面板横隔板圆弧过渡处的疲劳特性,本文以九江长江大桥实际结构为例制作了横隔板与U型肋局部构造细节疲劳试验试样,实验结果发现13个试样中有8个试样疲劳裂纹发生在横隔板与U型肋焊缝处,而有5个试样疲劳裂纹发生在横隔板母材圆弧过渡处,说明横隔板圆弧过渡处为疲劳破坏的危险部位之一.有限元分析与应力测试表明,该处为压应力状态区域,而剪切应力较大,其疲劳失效形式为剪切疲劳破坏,通过将实验数据与欧洲规范Eurocode3进行比较,该部位满足容许剪切应力幅值为100 MPa的Δτ-N曲线方程.该研究结果可为正交异性桥面构造细节强度设计和寿命评估提供参考.
In order to study the fatigue characteristics on the diaphragm arc transition for orthotropic bridge deck, Jiujiang Yangtze River bridge was taken as an example, and the fatigue test specimens of the diaphragm and U rib local structural detail were made. Experimental results showed that 8 samples fatigue crack occurred in the diaphragm with U rib welds in 13 samples, and 5 samples fatigue crack occurred in the diaphragm arc transitional area, which illustrated that the diaphragm arc transitional area is one of the dangerous places of the fatigue failure. Finite element analysis and stress tests all indicated that this region is in the compressive stress state, but the shear stress is very large, and the fatigue failure belongs to shear fatigue failure. Comparing the experimental data with European standard Eurocode3, we can find it meets the τ - N curve equation of the allowable shear stress amplitude for 100 MPa. The results of this study can provide reference for the strength design and life assessment on the orthotropic deck structure details.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2015年第2期62-66,共5页
Journal of Zhengzhou University（Engineering Science）
基金
江西省交通运输科技项目资助(2010C00003)
