• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
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  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 28 Issue 4
Jul.  2015
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Article Contents
DENG Zongcai, WANG Yichao. Axial Compression Stress-Strain Model for UHPC Cylinders Confined by FRP[J]. Journal of Southwest Jiaotong University, 2015, 28(4): 641-647. doi: 10.3969/j.issn.0258-2724.2015.04.011
Citation: DENG Zongcai, WANG Yichao. Axial Compression Stress-Strain Model for UHPC Cylinders Confined by FRP[J]. Journal of Southwest Jiaotong University, 2015, 28(4): 641-647. doi: 10.3969/j.issn.0258-2724.2015.04.011

Axial Compression Stress-Strain Model for UHPC Cylinders Confined by FRP

doi: 10.3969/j.issn.0258-2724.2015.04.011
  • Received Date: 16 Oct 2014
  • Publish Date: 25 Aug 2015
  • In order to investigate the axial compression behaviors of FRP (fiber-reinforced polymer) confined UHPC (ultra-high performance concrete) specimens under axial compression, 30 FRP confined UHPC specimens and 3 unconfined UHPC cylindrical specimens were tested. The effects of FRP types, layers of fiber sheets, and confinement methods (FRP tube or FRP sheet) on the compression behaviors of confined UHPC were analyzed. Based the test results and considering the confinement ratio and lateral restraint stiffness, new models for predicting the compressive strength and ultimate strain were proposed. In addition, the Lam-Teng model was improved by revising its a parameter. The research results indicate that confinement ratio and lateral restraint stiffness are the major influencing factors of the compressive strength and ultimate strain of confined UHPC, and the stress-strain curve of a confined specimen is consisted of a parabola and a straight line segment. The improved Lam-Teng model has a goodness of fit of 0.96, so it can predict the stress-strain relationship of confined specimens more accurately.

     

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