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Natural frequencies of cable-stayed bridges can be exactly obtained by means of eigenvalue calculations. But, in the initial stage of design, it will be sufficient to examine the preliminary aerodynamic stability for this type of bridges. Therefore, if relatively simple and accurate formula to evaluate the natural frequencies is available, it is considered that the application of such formula will be acceptable.In this brief paper, such formula evaluating the fundamental natural frequencies of the three span continuous cable-stayed bridges is proposed. Moreover, the vertical and torsional frequencies evaluated by this formula are proved as almost equivalent to the values exactly computed.

SIMPLIFIED EVALUATION TECHNIQUE OF THE FUNDAMENTAL NATURAL FREQUENCIES OF THE THREE SPAN CONTINUOUS CABLE-STAYED BRIDGES