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• W647121292 abstract "Highway bridge rating practice in the United States currently follows the procedures outlined in the Manual for Maintenance Inspection of Bridges. However, field testing results indicate that there is significant reserve strength in most bridges that is not accounted for by the AASHTO rating procedures. Consequently, bridges that possess sufficient strength to remain in service may be rated structurally deficient. This finding is especially significant for many older bridges that were designed for smaller loads, but that may possess sufficient capacity to allow the passage of modern vehicular loads. Because this reserve strength is not predicted by any contemporary analytical techniques, field testing is critical for developing rating procedures. This project focused on concrete slab bridges. In Nebraska there are many multiple-span slab bridges which were designed for H15 truck loading. Many of these bridges, when rated using current analytical tools, have insufficient capacity to carry modern traffic loads, resulting in their replacement, strengthening, or load posting. The overall objectives of this project were to assess more accurately the load carrying capacity of reinforced concrete slab bridges and develop simple analytical tools for predicting their behavior under service and ultimate load conditions. A five span bridge over the Niobrara River in northwestern Nebraska was selected for testing. Two spans of the bridge, which was built in 1938 and decommissioned in 1972, were subjected to numerous tests including loading to collapse. Using the BARS program the bridge was rated for approximately 67% of HS20 truck load. However, experimental results indicated that this bridge could carry 4 times the HS20 truck load in each lane while behaving in a perfectly elastic manner and, furthermore, it would require the equivalent of 7 HS20 truck loads in each lane to reach ultimate capacity. A detailed analytical study using finite element analyses and yield line analyses incorporating a moment curvature approach together with actual material properties were conducted to assess the differences between observed capacity and that predicted by conventional analysis approaches. Based on the experimental and analytical investigations conducted, it can be concluded that concrete slab bridges possess significant reserve capacity and that yield line analysis can effectively be utilized to accurately predict the strength of these bridges." @default.
• W647121292 created "2016-06-24" @default.
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• W647121292 date "1993-06-01" @default.
• W647121292 modified "2023-09-27" @default.
• W647121292 title "PERFORMANCE OF CONCRETE SLAB BRIDGES. FINAL REPORT" @default.
• W647121292 hasPublicationYear "1993" @default.
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