Abstract
Fatigue cracking and drilling on one side of component will weaken local stiffness and cause stress redistribution to aggravate cracking on the opposite side. By conducting fatigue tests and numerical simulation of typical details in steel decks, the influence of cracking and drilling on the stress characteristics of weld toe, local base metal, stop-hole and crack-growth ability on the opposite side of components was analyzed. The results demonstrate that the stiffness-based interference effect of fatigue cracking and drilling can be relieved by raising component dimensions. The fastest stress increment at the weld toe on one side of diaphragm-to-rib welded joints occurs as the crack on the opposite side of the U-rib propagates within 20 mm, which can be treated as the maintenance occasion for new initiated cracks. The crack growth will be aggravated after drilling on the opposite side of components, which will also conversely weaken the crack-arresting effect of stop-holes. Drilling shall be simultaneously applied on both sides of bilaterally cracked components. Drilling with the hole center right at the crack tip will lead to the largest stress increment on the other side, which shall be avoided. The hole diameter has greater impact than hole locations, while an early evaluation of local stress shall be conducted on the other side when adopting large holes.
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