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为研究东江大桥整体节点焊接残余应力的大小及分布规律,采用与实桥相同的焊接工艺制作了实桥E16节点的1∶1足尺模型,用盲孔法对该节点模型各主要焊缝的残余应力大小与分布进行了测试。结果表明:对于整体节点而言,焊接过程会产生很大的残余应力,其最大值接近材料的屈服强度;在焊缝区域,沿焊缝垂线方向,纵向残余应力均呈压应力-拉应力-压应力交替分布,规律明显,在焊缝中心处为最大拉残余应力;在不等厚对接焊区域,厚板一侧的残余应力大于薄板一侧;打磨和钻螺栓孔可以对残余应力起到释放作用;研究结论可为制定消除整体节点焊接残余应力的措施提供依据。
In order to study the size and distribution of welding residual stress in the whole joints of Dongjiang Bridge, a 1: 1 full-scale model of E16 node of real bridge was fabricated by the same welding process as that of the real bridge. Residual stress size and distribution were tested. The results show that: for the whole joint, the welding process will produce a large residual stress, the maximum close to the yield strength of the material; in the weld zone, along the vertical direction of the weld, the longitudinal residual stress was compressive - tensile stress - The compressive stress is alternately distributed with obvious regularities and is the maximum pull residual stress at the weld center. In the butt welds of unequal thickness, the residual stress on one side of the slab is greater than that on the side of the slab. Grinding and drilling the bolt holes can affect the residual stress To the release effect; the conclusion of the research can provide the basis for making the measures to eliminate the welding residual stress of the whole joint.