鋼種の異なる小形柱モデルの仮動的崩壊実験

概要

論文の詳細を見る
The effects of mechanical properties of steels on the earthquake response characteristics were investigated using an on-line pseudo-dynamic testing system. The specimens were H-shaped small-scale cantilever columns built up from four different grades of steel plates: 40-kgf/mm^2 class mild steel, 50-kgf /mm^2 class high-strength steel, 60-kgf/mm^2 class quenched and tempered steel, and 60-kgf/mm^2 class new-type high-strength steel with a low yield ratio. A virtual weight was attached at the top of the cantilever column so that the column failed due to the P-S moment. The axial force ratio was kept constant for all the specimens. The earthquake accelerations were of El Centro's NS-component and of Sine wave. The acceleration was factored so that the ratio of the peak acceleration to the yield shear coefficient was constant for all the steel grades. Some of the specimens eventually collapsed following a large displacement during the applied earthquake motion. The durations before the collapse were significantly different in the manner that the specimen with a higher yield strength had a shorter duration. The major reason of this test result is considered that the specimen with a higher yield strength had a steeper negative slope resulting from the P-d effect which could not be compensated by the strain hardening of the material.
一般社団法人日本建築学会の論文
1989-03-10