港珠澳大桥Ⅰ型肋板焊接变形预测及控制

Prediction and Controlling of Welding Deformation on Ⅰ Costal Region of Hong Kong-Zhuhai-Macao Bridge

港珠澳大桥采用I型肋板结构,该结构焊后容易在底板宽度方向上产生翘曲变形,故其焊接变形的预测和控制对现场焊接和产品质量具有重要意义。通过采用ANSYS有限元分析,得到了构件焊后变形规律,与实际焊接试验结果吻合。计算分析了不同厚度底板结构的焊接变形量,得到了20 mm厚肋板焊接变形量随底板厚度的变化符合公式:Y=3A·exp(-X/T)+Y0。最后,提出了进行焊前预留反变形和焊后火焰加热矫正,可有效地控制I型肋板焊接变形。

The I costal region structure was adopted in Hong Kong-Zhuhai-Macao Bridge. The structure is easy to deform along the width on the baseplate. The prediction and controlling of deformation to the site welding and the quality of production is very important. The deformation law of the component after welding, which is achieved by ANSYS FEM simulation, is comparable to the actual welding test. The welding deformation of different thickness baseplate structure was calculated, it is discovered that the variation of welding deformation is comparable to the formula： Y= 3A·exp（-X/T）＋Yo, when the I costal region is 20 mm. The reserved deformation before welding and flame heating after welding can effectively control the welding deformation of l costal region.