| The effective prestress is one of the main factors whether the bridge can operate safety in the prestressed bridges. In the use of bridge phase, Due to comprehensive of the adverse conditions and factors like the load, fatigue, corrosion, aging and environmental factors, the effective prestress in the bridge will produce a certain loss.Prestressed reinforcement of the difference between design value and the actual effective prestressing effect on the service capacity of the bridge. Even lead to bridge accidents, therefore, detection of effective prestressed bridge is very important.This article through to four slices of different arrangement forms of prestressed steel beam and concrete strength test beam model of indoor experimental study, the test beam under the condition of different prestress level and vertical load, collect Natural frequency of vibration, deflection and strain data, and then find out vibration dynamic stiffness (frequency), static stiffness (deflection, steel bar, concrete strain), and other parameters and the inner link between effective prestress, determine prestress change on different arrangement of prestressed steel beam and the influence of strength grade of concrete beam effect. compare and analyze the measured data and formula calculation and finite element numerical, and from the theoretical analysis, different loading methods, under the constraint condition, support spacing, sectional properties, prestress of prestressed concrete beam deflection, the influence of the frequency, and confirming which form of beam deflection, frequency is the most significant influence.In this paper, the testing method of prestressed concrete beams has carried on the positive exploration, structural static and dynamic performance of the prestressed concrete bridge assessment method research play a promoting role, and provide a reference for bridge structure rapid assessment method. |
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