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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationAdvances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010
PublisherHokkaido University Press
Pages593-602
Number of pages10
ISBN (Print)9784832903609
Publication statusPublished - 2010 Jan 1
Event2nd International Conference on Durability of Concrete Structures, ICDCS 2010 - Sapporo, Japan
Duration: 2010 Nov 242010 Nov 26

Publication series

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

Other

Other2nd International Conference on Durability of Concrete Structures, ICDCS 2010
CountryJapan
CitySapporo
Period10/11/2410/11/26

Keywords

  • Cyclic loads
  • Lightweight aggregate concrcte
  • Reinforced concrete beams
  • Tension stiffening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Building and Construction

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