| 摘要 |
PROBLEM TO BE SOLVED: To reduce weight of a girder, simplify execution of works and reinforce a diagonal member fixing part when applying a composite structure of concrete and a waveform steel plate to the girder of a cable stayed bridge. SOLUTION: The cable stayed bridge is composed by providing plural pairs of diagonal member fixing parts 12a at predetermined intervals in a bridge axis direction on both side parts of the girder 12 formed with a box shaped cross section by an upper deck slab 14, a lower deck slab 16 and a pair of right and left webs 18 comprising the waveform steel plates W. A steel shell diaphragm 22 is provided so it is joined with both webs 18 in a neighborhood portion of each pair of diagonal member fixing parts 12a in the girder 12. A horizontal component of diagonal member tension is resisted by the upper deck slab 14 and a concrete part the diagonal member fixing part 12, and a vertical component is resisted by the steel shell diaphragm 22 and both webs 18. Thereby, the diagonal member fixing part 12a is reinforced sufficiently for resisting the diagonal member tension. Also, the weight of the girder 12 is reduced and the execution of works is simplified in comparison with using concrete for reinforcing the diagonal member fixing parts 12a.
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