Fatigue Performance of Orthotropic Steel Decks with Thickened Edge U-Ribs
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摘要: 新型厚边U肋正交异性钢桥面的应用有望提高顶板与U肋连接焊缝的抗疲劳寿命. 为研究其实际疲劳性能和具体提升机理，对该类钢桥面中顶板与U肋连接焊缝开展了疲劳试验和数值分析. 通过足尺模型疲劳试验，采用名义应力法和热点应力法对常规等厚U肋钢桥面和新型厚边U肋钢桥面进行了对比；在疲劳试验的基础上，建立了精细化有限元模型并通过试验数据验证了其有效性；通过该模型对厚边U肋钢桥面顶板与U肋焊缝的疲劳性能提升机理进行了分析. 结果表明：厚边U肋的使用有效地提高了顶板与U肋连接焊缝的疲劳强度；在焊接负公差存在的情况下，厚边U肋试件对未熔透厚度的变化相对不敏感，从而保障了顶板与U肋连接焊缝疲劳性能的稳定性. 厚边U肋正交异性钢桥面在北京三元桥新桥和成都凤凰山高架桥等工程项目中的应用验证了其抗疲劳的有效性.Abstract: The fatigue performance of rib-to-deck (RD) joints is expected to be enhanced by the application of the orthotropic steel deck (OSD) with thickened edge U-ribs (TEUs). To investigate its actual fatigue performance and the mechanism of enhancement, the RD joints in the OSD with TEUs using the fatigue test and numerical analysis was evaluated.Through the fatigue model test of full-scale specimens, comparative analysis was performed on the OSD with conventional U-ribs (CUs) and the OSD with TEUs,in the test, both the nominal stress and hot spot stress approaches were incorporated. A refined finite element (FE) model was established based on the test, and validated by the test data. Using the model, numerical analysis was carried out to study the mechanism of the enhancement in RD joints by the application of TEUs.The results show that: the use of TEUs improve the fatigue strength of rib-to-deck joints effectively; in the presence of negative welding errors, the specimens with TEUs are relatively insensitive to the variations in unpenetrated thicknessthat leading to the robustness of the fatigue strength of rib-to-deck joints. The fatigue performance of the OSD with TEUs has been further validated through its application in several engineering projects such as New Sanyuan bridge in Beijing and Fenghuangshan Viaduct in Chengdu.
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Key words:
- bridge engineering /
- orthotropic steel deck /
- fatigue test /
- thickened edge U-rib /
- U-rib-to-deck joint
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图 7 不同未熔透厚度下等厚U肋试件等效切口应力云图
Figure 7. Contours of effective notch stress of CU specimens with different unpenetrated thickness
图 8 不同未熔透厚度下厚边U肋等效切口应力云图
Figure 8. Contours of effective notch stress of TEU specimens with different unpenetrated thickness
图 9 不同未熔透厚度下两类试件最大等效切口应力
Figure 9. Maximum effective notch stress for CU and TEU specimens with different unpenetrated thickness
表 1 实际施加荷载
Table 1. Applied loads on the specimens
试件
编号施加 最小 (Fmin) 最大 (Fmax) 荷载幅 (Fmax – Fmin) CU-1 13.0 39.0 26.0 CU-2 16.5 49.5 33.0 CU-3 20.0 60.0 40.0 TEU-1 18.0 54.5 36.5 TEU-2 19.0 57.0 38.0 TEU-3 20.0 60.0 40.0 TEU-4 20.5 62.0 41.5 
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表 2 试验结果汇总
Table 2. Summary of the testing results
试件
编号顶板测点
应力/MPaU肋测点
应力/MPa裂纹贯穿次数
Ntest/ （× 104次）等效疲劳
强度/MPa名义 热点 名义 热点 名义 热点 CU-1 81 98 99 101 269 89 108 CU-2 103 121 109 117 255 112 131 CU-3 123 149 130 145 91 95 115 TEU-1 114 144 150 126 147 103 130 TEU-2 119 146 145 123 162 111 136 TEU-3 125 154 140 115 234 132 162 TEU-4 129 153 138 122 193 127 157
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表 3 静载作用下试件部分测点静载应力实测值与计算值对比
Table 3. Comparison between measured and computed stress under static load
截面
位置测点
编号CU-3 TEU-3 计算值 实测值 偏差
/%计算值 实测值 偏差
/%前端 D24L 125 123 2 124 125 –1 U12L 141 130 8 148 140 6 UB –43 –45 –4 –45 –47 –4 中部 D24L 100 105 –5 100 105 –5 U12L 145 153 –5 155 149 4 UB –45 –47 –4 –47 –48 –2
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