芯材に波形鋼板を適用した座屈拘束ブレース(RP-BRB)の性能実験と解析  [in Japanese] AN EXPERIMENTAL AND ANALYTICAL STUDY ON BUCKLING- RESTRAINED BRACES WITH RIPPLED CORE PLATE (RP-BRB)  [in Japanese]

Access this Article

Author(s)

Abstract

本研究では,橋梁の横構・対傾構などに用いられる座屈拘束ブレース(BRB)の芯材をこれまでの平板から波形鋼板としたBRB(RP-BRB)について検討する.RP-BRBの芯材は,既往の研究で用いたBRRPの波形芯材と比較し,幅が狭く,長尺かつ波形の数が多いため,局部変形や全体座屈などによる荷重-変位履歴の不安定化が懸念される.そのため,間隔保持材やガイド突起を設置することによって,これらの変形を抑制し,履歴曲線の安定化を図っている.間隔保持材やガイド突起の数を変えた数種類の供試体を製作し,変動変位振幅載荷を行うことによって,荷重-変位履歴に及ぼす影響を明らかにしている.また,芯材の材料定数を波形鋼板の引張試験から定める方法を提案し,その妥当性を解析によって確認している.

 A new type of BRB named RP-BRB (Rippled Plate Buckling Restrained Brace) is investigated. The core member of RP-BRB is a rippled plate instead of flat plate in BRB. Compared to BRRP which was studied previoulsy, RP-BRBs possess long and multiple-wave core members. Thus special care must be given to prevent the unstable load-deformation characteristics due to local/overall buckling of the core members as well as friction effects between the core member and the restraining members.<br> In this study, RP-BRB specimens with two special devices are tested: 1) a pair of projecting bars bolted to both sides along the core member (the guide series test) , and 2) semi-cylindrical shape spacers set inside the ripples (the space series test). Cyclic loading tests are carried out using test specimens possessing various numbers of either the projecting bars or the spacers. Then loading and deformation capacities, hysteretic characteristics, local strains occurred in the core members are examined and the efficiency of using the special devices is demonstrated. Moreover, material properties of the rippled core plate are determined from tensile tests, and its validity is confirmed by comparison between the analysis and test.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 72(4), I_264-I_278, 2016

    Japan Society of Civil Engineers

Codes

Page Top