Abstract
Dynamic loads caused by wind and earthquakes are a critical issue when planning and designing large bridges. Studies on wind loads normally involved using wind-tunnel tests to investigate wind-resistance measures, including the section shape of stiffening girders for suspension bridges. Although some reports present the results of follow-up studies on completed bridges, so far a sufficient quantity of data has not accumulated to enable practical estimation of the oscillation properties of bridges. This paper reports on the oscillation properties of an actual bridge, such as the damping factor and natural frequency, which were investigated by wind-tunnel tests of a scale model of the Ohshima Ohashi Bridge (one of a series of spans which form a link between Honshu and Shikoku in Japan) and oscillation tests of the actual bridge. The effects of center-stay cables, which are considered effective for improving wind resistance, were also investigated.
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