The prestressed ducts of concrete continuous girder bridges are usually three-dimensionally distributed and long in length. control prestress loss during construction is very important. In order to ensure the effect tensioning, test analysis friction parameters particularly Based on tension process a beam bridge, initial stress, loading time channel bridge tested by field tests. Combined with m...

<p>A prestressed concrete bridge was built in 1963 with BBRV cables. It has three spans and a total length of 134.8 m. Due to mining activities the loaded trucks weight 90 ton during 2012-2014 from 2019. Crack development been monitored manually 2020 strain gauges LVDTs. Cracks normally vary between 0.1 0.3 mm width grow time. In November some on showed alarming growth closed for traffic....

The author carried out dynamic load test research on a prestressed concrete rigid frame bridge. Under load, the ratios of measured and theoretical frequencies first four vertical vibrations bridge were 1.081, 1.153 respectively. corresponding damping are 0.011, 0.010 maximum coefficient sports car is 1.049, strain increment 0.059. impact between 0.012 0.049, which basically equivalent to design...