Experimental Research on Slip Factors of Corroded Slip-Critical Weathering High-Strength Bolted Connections

To study the effect of corrosion on the slip factors of weathering high-strength bolts, the slip factor tests under different corrosion times were conducted on 23 high-strength bolted connecting specimens cleaned by sandblasting and manual cleaning. The test includes 10 specimens composed of Q355GNH weathering steel and NHL10 weathering high-strength bolts, 10 specimens composed of Q355B ordinary steel and NHL10 weathering high-strength bolts, and 3 specimens composed of Q355GNH weathering steel and ML20MnTiB ordinary high-strength bolts. The effects of different surface treatments and materials on the slip factors of weathering high-strength bolted connections were studied. The test results showed that the surface treatment had no noticeable effect on the corrosion rate and speed of the steel plates; the bearing capacity of the weathering high-strength bolted connecting specimens after sandblasting was higher, and the slip factors were more stable; for the connecting specimens composed of weathering steel plates and ordinary high-strength bolts, due to the existence of corrosion potential difference, the time for the corrosion rate of weathering steel plates to stabilize was prolonged; at the same corrosion time, the slip factors of the specimens composed weathering steel plate and weathering high-strength bolts were less affected by corrosion, so the specimens would be more suitable for severe corrosion environments.