Evolution of visible damage and change of natural frequency in reinforced concrete beams subjected to four-point bending load

• Mori Shinichiro

  愛媛大学 大学院理工学研究科

• Kobayashi Takumi

  （国研）土木研究所 構造物メンテナンスセンター

Bibliographic Information

Other Title

• 4 点曲げ載荷を受ける鉄筋コンクリート梁の可視損傷の進展と固有振動数の変化

Abstract

In order to investigate the relationship between mechanical damage propagation and natural frequency change, a multi-stage loading test was conducted on two RC beams, one without a defect and the other with a defect in the center of the brace. Differences in damage propagation and the associated load bearing mechanism, mainly due to the concrete strength and the presence of notches, affected the load deflection history curves and the rate of decrease in natural frequencies for both specimens. Loading up to about 64% of the final load reduced the flexural stiffness with respect to dynamic behavior by 10% and the static unloading stiffness by 50%.

Journal

• Journal of Structural Engineering, A

  Journal of Structural Engineering, A 67A (0), 208-219, 2021

  Japan Society of Civil Engineers

Keywords

• natural frequency
• multi-stage loading
• crack
• residual deflection

Details

• CRID: 1390850656304155904
• NII Article ID: 130008025968
• DOI: 10.11532/structcivil.67a.208
• ISSN: 1881820X
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed