A study on evaluation for residual axial force of corroded high strength bolts

对高强度螺栓腐蚀后的残余轴力进行了研究。从螺母的形状和减薄程度两个方面对从一座倒塌的钢梁桥上切下的锈蚀高强度螺栓进行了分类。结果表明，残余轴向力似乎是影响的形状，除了厚度减少。分析表明，轴向力因板厚减薄而减小的原因是由于螺母边缘的局部变形和拼接板的孔缘变形。此外，还揭示了测量垫圈附近的厚度减少量可以评估残余轴向力。

The residual axial force of corroded high strength bolts has been investigated. The corroded high strength bolts cut out from a collapsed steel girder bridge were classified from the viewpoints of shape and thickness reduction of nut. The results showed that the residual axial force seems to be affected by the shape, in addition to the thickness reduction. It was analytically indicated that the decrease in an axial force by the thickness reduction is caused by the local deformation of nut edge and hole ci rcumference of splice plate. Moreover, it was revealed that the measurement of the thickness reduct ion near the washer can evaluate the residual axial force.