2方向地震動を受ける円形断面鋼製橋脚の限界値と動的耐震照査法に関する考察

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  • Ultimate state and design of thin-walled circular steel columns under bi-directional seismic excitations

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An investigation is made on how the coupling of bi-directional horizontal seismic excitations affects the ultimate behavior of thin-walled circular steel columns used as bridge piers. First, an instability criterion is derived to identify the ultimate limit state of columns under bi-directional horizontal loads. Then, an ultimate interaction curve expressed in terms of two horizontal restoring force components is derived based on the so-called pushover analysis. The accuracy of the proposed ultimate interaction curves is confirmed by carrying out an extensive materially and geometrically nonlinear dynamic analysis under various bi-directional seismic excitations. Finally, in view of the application to practical design, the derivation method of some partial safety factors is also discussed.

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