A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Strength Continuity of Deteriorated Continuous Slab R.C. Bridges
Continuous reinforced concrete slab bridges rely on reinforcing steel near the top of the deck over the piers to carry negative moment. However, these negative moment resisting bars and the concrete around them are vulnerable to deterioration from traffic wear, deicing salts and weather. When the concrete around the bars deteriorates, the bars may debond and lose negative moment carrying capacity. This situation may be complicated by a common repair method called variable depth removal. In this method, deteriorated concrete is removed from the deck and the deck is patched. However, when the deterioration is excessive, enough concrete may be removed to completely debond the negative moment resisting bars. If these bars are fully or partially debonded, the continuity over the pier lines may be fully or partially lost. This results in an increase in the positive moments in the spans since the spans now behave like simple, rather than continuous spans. This research tested three bridges to determine if variable depth removal affected the moment distribution and stiffness of bridges under repair. One bridge had only slight damage over the piers, one bridge had moderate damage over the piers, and the third bridge had severe damage over the piers. The bridges were tested by truck loading, with the trucks placed to cause maximum deflection in two spans and maximum negative moment over the piers. Deflections and slab strains were measured. Slab moments were inferred from the slab strains.
Strength Continuity of Deteriorated Continuous Slab R.C. Bridges
Continuous reinforced concrete slab bridges rely on reinforcing steel near the top of the deck over the piers to carry negative moment. However, these negative moment resisting bars and the concrete around them are vulnerable to deterioration from traffic wear, deicing salts and weather. When the concrete around the bars deteriorates, the bars may debond and lose negative moment carrying capacity. This situation may be complicated by a common repair method called variable depth removal. In this method, deteriorated concrete is removed from the deck and the deck is patched. However, when the deterioration is excessive, enough concrete may be removed to completely debond the negative moment resisting bars. If these bars are fully or partially debonded, the continuity over the pier lines may be fully or partially lost. This results in an increase in the positive moments in the spans since the spans now behave like simple, rather than continuous spans. This research tested three bridges to determine if variable depth removal affected the moment distribution and stiffness of bridges under repair. One bridge had only slight damage over the piers, one bridge had moderate damage over the piers, and the third bridge had severe damage over the piers. The bridges were tested by truck loading, with the trucks placed to cause maximum deflection in two spans and maximum negative moment over the piers. Deflections and slab strains were measured. Slab moments were inferred from the slab strains.
Strength Continuity of Deteriorated Continuous Slab R.C. Bridges
B. Shahrooz (author) / R. Miller (author) / V. Saraf (author) / B. Godbole (author)
1994
155 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Bridge maintenance , Reinforced concrete , Concrete structures , Stress analysis , Loads(Forces) , Deterioration , Finite element method , Deflection , Moments , Load bearing capacity , Reinforcement(Structures) , Repair , Structural analysis , Stress strain relations , Concrete slabs
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