钢桥面板顶板角焊缝疲劳裂纹钻孔孔位分析

发布时间：2018-04-28 06:44

本文选题：钢桥面板 + 角焊缝　；参考：《广西大学学报(自然科学版)》2017年01期

【摘要】：结合钢箱梁局部模型试件,针对顶板角焊缝处表面裂纹进行钻孔止裂,进行止裂孔孔周应力计算,分析了不同孔位对止裂效果的影响并提出了合理止裂孔位,最后结合实际工程中止裂孔孔径应用情况,研究了合理止裂孔位与孔径的关系。分析结果表明,止裂孔没有改变构件整体应力变化趋势,孔边存在很大的应力降,但有应力台阶现象;孔位在0.5D(D为孔径尺寸)更远后,裂尖与孔边之间出现高应力、大应力降连接段,合理止裂孔位为0.5D,孔径大小对合理孔位与孔径的系数没有影响;止裂孔在裂纹尖端外情形下,孔径较小时,最大应力点还在裂纹尖端,孔径较大时,最大应力点在裂纹侧孔边,且离裂纹尖端越远,孔两侧最大应力差越小。
[Abstract]:Combined with the local model test of steel box girder, according to the crack of surface crack at the corner seam of the roof, the Kong Zhou stress calculation is carried out, the effect of different hole position on the crack stopping effect is analyzed and the reasonable crack position is put forward. Finally, the relationship between the pore size and the pore size is studied. The analysis results show that the crack stop hole does not change the trend of the whole stress change, and there is a large stress drop in the hole edge, but there is a stress step phenomenon. The hole position is high stress between the crack tip and the hole edge after the 0.5D (D is the aperture size), the reasonable stop hole is 0.5D, the pore size is the reasonable pore and the aperture coefficient. There is no effect; the maximum stress point is still at the crack tip in the case of the crack tip outside the crack tip. The maximum stress point is at the edge of the crack side when the aperture is larger, and the farther the crack tip is, the smaller the maximum stress difference on both sides of the hole is.

【作者单位】：河海大学土木与交通学院;
【基金】：国家自然科学基金面上项目(51478163) 江苏省交通运输科技与成果转化项目(2016Y10-1)
【分类号】：U441.4

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