@article{oai:kumadai.repo.nii.ac.jp:00021754,
 author = {Tanimoto, Norio and Ogawa, Koji and 小川, 厚治 and 谷本, 憲郎 and Ogawa, Koji and 小川, 厚治},
 issue = {23},
 journal = {鋼構造論文集},
 month = {Jul},
 note = {application/pdf, 論文(Article), The apparent natural period (the time required for one cycle vibration) of steel frames accompanied with plastic deformations under strong motion is longer than the natural period calculated from the initial elastic stiffness. Because earthquake input energy by ground motion depends primarily on the apparent natural period, the plastic deformaion of steel frames increases, the apparent natural period becomes longer, and earthquake input energy becomes higher. The present paper proposes the expression to approximate the mean of the apparent natural period in the whole vibration and demonstrates that the variation (increase) of the earthquake input energy of steel frames accompanied with plastic deformations can be predicted by using this expression., http://www.jssc.or.jp/},
 pages = {71--79},
 title = {塑性化に伴う鋼構造骨組の地震入力エネルギーの変動に関する研究},
 volume = {6},
 year = {1999},
 yomi = {オガワ, コウジ and オガワ, コウジ}
}