Repair and Service Safety Evaluation of a Fire Damaged Concrete Bridge

Abstract:

The Yao Zhou downlink Viaduct damaged in a fire accident was repaired using steel plate and concrete composite strengthening (SPCCS) technique. After strengthening and servicing normally for 1.5 years, two loading tests, meanwhile, a three-day traffic information observation and dynamic strain monitoring were carried out. The static loading test and monitoring results all showed that the Yao Zhou downlink Viaduct had good service condition since reinforcement, which satisfying the safety requirement. In order to evaluate the effectiveness of the SPCCS technique in-depth, structural behaviour under the ultimate limit state (ULS) and the serviceability limit state (SLS) were analyzed. The SLS and ULC of the key sections before and after reinforcement were calculated using the simplified formula and the finite element models calibrated by filed test results. The post-evaluation results showed that the behaviour of the spans damaged in fire accident could be improved obviously under the SLS using SPCCS technique, as well as the bridge stiffness enlarged than the original bridge structure. The ultimate bearing capacity (UBC) of the key sections was improved about 75% using SPCCS technique, which was two times as the most disadvantageous load effect combinations. Whats more, the fatigue life of fire damaged box girders strengthened using SPCCS technique was evaluated based on monitoring strain data, and the further bridge maintenance suggestions were proposed based on the assessment results.

• Periodical: Key Engineering Materials (Volumes 525-526)
• Pages: 145-148
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.525-526.145
• Online since: November 2012
• Authors: Chun Sheng Wang, Lu Ping Liu, Mao Sen Wei
• Keywords: Concrete Bridge, Concrete Composite Strengthening Method, Dynamic Strain Monitoring, Fatigue Life, Steel Plate, Stiffness, Ultimate Bearing Capacity

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