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On the basis of the study and application of ordinary steelencased concrete composite beam theory, this essay puts forward a kind of new high strength steel encased concrete composite beams, and mainly studies high performance steel Q420 and Q460, also high strength concrete C60 and C80. Besides, the essay has the experimental study of 5 simplysupported beams, and analyses the loaddeflection curves of new high strength steel encased concrete composite beams. Calculation formula of load which changes with depth of section and flexural strength is given, and suggests that the calculated results announced should be identical with the experimental results.
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