入力地震動の位相特性が鋼構造体育館の最大応答や動的靭性指標に与える影響

摘要

本研究では，桁行方向に地震入力を受ける鋼構造体育館を想定した1自由度系モデルを用い，群遅延時間t_(gr)の標準偏差σ_(tgr)の異なる模擬地震動の違いが1自由度系の最大変位や動的靭性指標_dF値に与える影響を検討した。%鋼構造体育館; 動的靱性指標; 変形能力; 珩面ブレース; 地震応答解析; 位相特性; 群遅延時間 ;This paper discusses on an influence of phase haracteristics of input ground motions on maximum responses, dynamic seismic performance index of structure, _dI_s, and a dynamic ductility index, _dF. As numerical parameters, a group delay time of input ground motion, an initial natural period and a capacity limit deformation of braces as well as a hysteresis type are taken into consideration, and their effects on the maximum responses and the value of_dF, are investigated based on elasto-plastic dynamic response analysis. As the standard deviation σ_(tgr) of the group delay time increases, the effective duration of the simulated seismic ground motion increases and the seismic input energy tends to increase. Although the _dF value of the bilinear hysteresis type hardly varies depending on the value of the slip hysteresis type shows a tendency to decrease with an increases in σ_(tgr).