ベースプレート降伏により柱脚浮き上がりを許容した鉄骨造縮小模型架構の3次元振動台地震応答実験

摘要

The seismic response of three-story one-third-scale steel frames with columns allowed to uplift is evaluated and compared with that of fixed-base frames by three-dimensional shaking table tests. The test frames were retested using four different frame conditions: uplift-base and fixed-base frames; plan symmetric and asymmetric frames. The results are: 1) While the column uplift displacements of the uplift frames is increased by the vertical component of the input motion, the horizontal response values such as the roof drifts and base shears are not affected by that; 2) The difference of the roof floor rotations between the symmetric and asymmetric uplift frames are not increased in spite of the increase of the input motion intensity; 3) The base shears of the uplift frames are effectively reduced from those of the fixed-base frames; and, 4) The deformation of the uplift frames excluding the rocking component is nearly equal to or smaller than the elastic response value of the fixed-base frames.%浮き上がり降伏するベースプレート（BPY）を1層柱脚部に組み込rnんだBPYモデルと1層柱脚部を固定したFIXモデル、並びにそれrnぞれに偏心が有るBPYAS、FIXASモデルの計4種類の3屑鉄骨造縮rn小模型試験体について、3次元地震動入力による振動台実験を行い、rnそれらの弾塑性応答性状（BPYのみが塑性化）を検討した。その結果rn以下の知見を得た。