Tension stiffening effects in flexural reinforced lightweight aggregate concrete beams subjected to long-term cyclic loads

How Ji Chen, Te Hung Liu, Kuo Chang Jane, Hui Wen Liao, Kung-Chung Hsu

研究成果: 書貢獻/報告類型會議論文篇章

摘要

The present study experimentally investigated the tension stiffening in flexural reinforced concrete (RC) beams cast by lightweight aggregate concrete (LWAC) under long-term cyclic loads, i.e., high-cyclc fatigue loading conditions. Based on the strain measurement from tension steels in RC beams, the reduction in bond-related tension stiffening induced by fatigue was described. The comparisons of the companion reinforced normal weight concrcte (NWC) beams of equivalent concretc strength of 40 MPa were made. The measured total response of mean steel strains during fatigue tests was evaluated from the aspect of the elastic and plastic strain components. The experiment results showed that the mechanism of mean steel strain evolution with cyclic loads in LWAC beams was essentially different from NWC beams. On the whole, LWAC beams had a lesser reduction in tension stiffening due to the better bond between reinforcement and concrete. This was demonstrated by the more linear curves in the applied toad-mean steel strain diagrams after the initial cracking. In addition, compared to NWC beams, there also were a slight growth of the elastic strain components and a higher degree of local plasticity developed at the location of the primary flexural cracks in LWAC beams.

原文英語
主出版物標題Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010
發行者Hokkaido University Press
頁面593-602
頁數10
ISBN(列印)9784832903609
出版狀態已發佈 - 2010 一月 1
事件2nd International Conference on Durability of Concrete Structures, ICDCS 2010 - Sapporo, 日本
持續時間: 2010 十一月 242010 十一月 26

出版系列

名字Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010

其他

其他2nd International Conference on Durability of Concrete Structures, ICDCS 2010
國家/地區日本
城市Sapporo
期間2010/11/242010/11/26

ASJC Scopus subject areas

  • 土木與結構工程
  • 海洋工程
  • 建築與營造

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