An improved approach for measuring cracking and decompression moments in prestressed concrete members

Wen Long Guo, Zhi Jiazng Han, Y. Frank Chen, Zhi Hua Liu, Ying Sheng Ni

Research output: Contribution to journalArticle

Abstract

A relatively new experimental-analytical method for determining the location separating the cracking and decompression moments of a prestressed concrete (PC) flexural member is proposed. This method is based on the changeable mechanism of tension-zone reinforcement considering the variation of tensionreinforcement strain rates and the sensitivity of system parameters. The proposed method is shown to improve the sensitivity of experimental parameters on the flexural behaviour of PC members under different loading conditions. For uncracked sections, the proposed method can determine the cracking moment accurately, similarly to the traditional moment-strain curve method. For cracked sections, the traditional method cannot clearly define the transition point on the moment capacity curve as it does not separate the linear variation (before cracking) from the non-linear variation (after cracking), especially when the non-linear part is only a small portion of the total strain and varies slowly. However, the proposed method can well describe the stress change of tensile reinforcement and monitor the decompression moment at a cracked section. The proposed approach is recommended for clearer mechanical concepts, improved fundamental theory and testing convenience.

Original languageEnglish (US)
Pages (from-to)71-80
Number of pages10
JournalStructural Engineering International
Volume28
Issue number1
DOIs
StatePublished - Jan 31 2018

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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