A staticnonlinearanalysis is taken by using data which are stored in a data area so far to calculate the horizontal displacement quantity of the top position of the structure model and after the yield displacement quantity δy and yield seismic coefficient Khy of the elevated bridge structure are extracted, an equivalent natural cycle Teq is calculated. これまでにデータ領域に格納されたデータを用いて、静的非線形解析を行い、構造物モデルの天端位置の水平変位量を算出し、前記高架橋構造物の降伏変位量δy、降伏震度Khyを抽出した後、等価固有周期Teqを算出する。 - 特許庁