Experimental study on the flexural behavior of cold-formed U-shaped steel-encased confined prestressed RC beam

Jiepeng Liu, Guping Chen, Yohchia Frank Chen, Tianxiang Xu

Research output: Contribution to journalArticlepeer-review

Abstract

This paper discusses the flexural behavior of a cold-formed U-shaped steel-encased confined prestressed RC beam (CUSCPC). In this system, the U-shaped thin-walled steel girder provides the restraining stress to the partially confined concrete beams, participates the deformation of the composite beam under servicing loads and serves as a permanent formwork for the prestressed concrete (PC) beam during construction. Shear studs are welded on the inside of the closed end of U-shaped steel girder to provide a full shear connection between the concrete and thin-walled steel plate. Same number of CUSCPC specimen but with no shear studs were made for comparison purposes. Two additional parameters were also considered: ratio of tension reinforcement and ratio of P/S strands. The test results show that all specimens have excellent ductility and display a flexural failure pattern. The brittle behavior disappears due to the triaxial stress state of the partially confined concrete beam encased with the U-shaped thin-walled steel girder. It is also found that the load-bearing capacity of the CUSCPC beams with shear studs is increased by 5–10%, compared with the conventional PC members and the CUSCPC beams with no shear studs.

Original languageEnglish (US)
Article number106656
JournalJournal of Constructional Steel Research
Volume182
DOIs
StatePublished - Jul 2021

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

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