| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of the local buckling of a lower flange of an I-beam and a lower portion of a web and the lateral buckling of the whole I-beam, and to increase the load bearing capacity of the I-beam near an intermediate supporting point of a continuous I-beam bridge by enhancing the combined effect of steel and concrete in each cross section orthogonal to the longitudinal direction of the I-beam. SOLUTION: A plurality of deviation stoppers 40 are arranged on the top surface of the lower flange 34 near the intermediate supporting point 12 of the continuous I-beam bridge 10; fresh concrete is placed in a space, which includes the deviation stoppers 40 and which is surrounded by the top surface of the lower flange 34, the lower portion of the web 36 and a lower portion of a vertical stiffener 38A, in such a manner that the concrete 46 obtained by the hardening of the fresh concrete is contained in a compression area as an area below a neutral axis of plasticity; the whole deviation stopper 40, the top surface of the lower flange 34, the lower portion of the web 36 and the lower portion of the vertical stiffener 38 are integrated with the concrete 46, so as to prevent the local buckling of the lower flange 34 and the lower portion of the web 36 and the lateral buckling of the whole I-beam 30. COPYRIGHT: (C)2009,JPO&INPIT
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