Study on Static Mechanics Test of Prefabricated Steel Plate Composite Beam
To understand the basic mechanical properties of prefabricated steel plate composite beams,a multi-level static load test was conducted based on a 30 m span prefabricated steel plate composite beam from the Changyi Expressway expansion project.The test involved comparing actual measurements with theoretical calculations to evaluate the structure's load-bearing capacity under standard design loads.The results showed that the mid-span deflection under design load was 16.15 mm,and the measured strain was 190 x 10-6,both of which were lower than their theoretical values,indicating the actual working condition of the structure was better than expected.The verification coefficients for deflection and strain at various points of the π-shaped composite beam were all less than 2.0,with relative residual deformation less than 0.2,meaning the structure remained in an elastic state under design loads.It demonstrated good strength and stiffness,meeting design requirements and making it suitable for use as the main structure of bridge superstructures.These conclusions can provide a reference for the widespread application of similar types of bridges.
prefabricated steel plate composite beamstatic load testbearing capacityelastic state
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