Analytical demonstrations to assess residual bearing capacities of steel plate girder ends with stiffeners damaged by corrosion
Analytical demonstrations to assess residual bearing capacities of steel plate girder ends with stiffeners damaged by corrosion
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评估带腐蚀损坏加强筋的钢板梁端部残余承载力的分析论证
DOI：
10.1080/15732479.2012.697904
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Yamada
中科院分区：
文献类型：
--
作者：
Nauman Khurram;E. Sasaki;H. Kihira;H. Katsuchi;H. Yamada
许多实地调查表明，由于施工缝漏水和/或承载区域附近雨水滞留，钢板梁末端容易腐蚀。在许多情况下，板梁的屈曲破坏是由于轴承加强筋底部材料的过度损失造成的。本文研究了支座加强筋处腐蚀损伤对钢板梁屈曲强度的影响。对两个板梁端部进行了全尺寸试验，以确定其承载力。通过数值分析验证了其承载能力和破坏模式。在分析模型中还考虑了初始缺陷和焊接残余应力。考虑焊缝附近轴承加强筋损伤高度和厚度的不同，将模型的模拟扩展到各种腐蚀损伤。在保持加劲筋损伤高度不变的情况下，所有结果均以剩余承载力与损伤厚度之比绘制。本文采用减薄比损伤参数对不同腐蚀程度的钢板梁端部极限承载力和屈曲进行了评估。
Many field surveys depict that steel plate girder ends tend to corrode due to the leakage of water from construction joints and/or detention of rain water near bearing regions. In many cases, buckling failures of plate girders were observed due to the excessive loss of material at the bottom portion of bearing stiffeners. In this study, the effect on the buckling strength of steel plate girder due to the corrosion damage at bearing stiffeners was investigated. Full-scale experimental tests were performed on two plate girder ends to determine the bearing capacity. Bearing capacity and failure modes were also verified by numerical analyses. Initial imperfections and welding residual stresses were also taken into account in analytical models. The simulation of the model was extended to the various corrosion damages, considering different damaged heights and thicknesses of the bearing stiffener near weld seam. All results were plotted in terms of remaining bearing capacity versus damage thickness ratio keeping the damage height of the stiffener constant. In this study, a damage parameter Reduced Thickness Ratio was used to assess the ultimate capacity and buckling of steel plate girder end with various corrosion levels.