Flexural Behavior Test and Normal Section Bearing Capacity of RC Beam Strengthened with Aluminum Alloy Plate
In order to investigate the effects of the thickness of aluminum alloy plate and the U-shaped aluminum alloy hoop plate structure on the failure mechanism and flexural performance of RC beams,16 RC beams strengthened with aluminum alloy plates are tested under 4-point bending static loading.The strain gauges are pasted on the surface of the aluminum alloy plate at the bottom of the test beam and on the top and side of the mid-span section of the test beam,and the dial indicators are arranged at the middle of the bottom span and at the both ends of the top of beam.In order to derive the calculation formula of normal section bearing capacity of RC beams strengthened with aluminum alloy plates,based on the failure mechanism obtained from the tests,the heights of relative compression zone of 5 different failure modes are analyzed by introducing 6 basic assumptions.The formulas for calculating the bearing capacity of RC beams strengthened with aluminum alloy plates with various failure modes are established and compared with the experimental results in the literature.The result shows that(1)the failure modes of the specimens include 4 conditions:suitable reinforcement failure,end aluminum alloy plate and structural adhesive peeling,end aluminum alloy plate and beam peeling,and middle aluminum alloy plate peeling;(2)when the U-shaped aluminum alloy hoop plate is set at the end,the end aluminum alloy plate can be effectively inhibited from peeling,and the material properties of the steel bar and aluminum alloy plate are fully played;(3)when the thickness of the aluminum alloy plate is 2-6 mm,the bearing capacity of the specimen increases with the increase of the thickness of the aluminum alloy plate;(4)setting the U-shaped aluminum alloy ferrule plate at the end can effectively prevent the aluminum alloy plate at the end from spalling,but the aluminum alloy plate at the middle of the specimen may still spalling;(5)the ratio of the calculated value to the test value is less than 1 when the failure characteristics of the bars appear.The presented formula has obvious regularity and applicability,which can provide reference for practical engineering design.
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