実大震動台実験における高層鉄骨造建物の地震損傷検知

摘要

本論文では、長周期地震動を受ける高層鉄骨造建物の震動台実験における美大試験体を対象として、常時微動観測と加振実験観測により高密度かつ高品質な観測により美大構造物の構造特性の変動を評価した.その結果、加振実験観測から算出した層剛性と固有振動数により試験体の構造状態の変化や損傷を明瞭に把握できること、さらに、微動観測により同定した層剛性と固有振動数との比較を行い、その関係性から微動観測の同定結果の有効性を確認した.%Changes in story stiffness and natural frequency of a high-rise building on the E-defense full-scale shaking test are experimentally evaluated from small excitations to the end of the ultimate shakes, which are expected to employ as damage index for structural health monitoring. Two kinds of changes are observed similarly from both shake test and ambient vibration, which occurred in the first seismic experiences by small excitations and after the severe damage when complete ruptures on main girders appeared in ultimate shakes. The latter severe changes in story stiffness are well-simulated by using a finite element analysis for seismic design.