Post-tensioning of glass beams: Analytical determination of the allowable pre-load

Jagoda Cupać*, Christian Louter, Alain Nussbaumer

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The effectiveness of post-tensioning in enhancing the fracture resistance of glass beams depends on the level of compressive pre-stress introduced at the glass edge surface that will in service be exposed to tensile stresses induced by bending. Maximum pre-load that can be applied in a post-tensioned glass beam system, yielding maximum compressive pre-stress, is limited by various failure mechanisms which might occur during post-tensioning. In this paper, failure mechanisms are identified for a post-tensioned glass beam system with a flat stainless steel tendon adhesively bonded at the bottom glass edge, including the rupture of the tendon, glass failure in tension and adhesive/glass failure in the load introduction zone. Special attention is given to the load introduction failure given that the transparent nature of glass limits the use of vertical confinement usually applied in concrete. An analytical model for determination of the allowable pre-load in post-tensioned glass beams is proposed, based on the model applied for externally post-tensioned concrete beams. The model is verified with the results of a numerical model, showing good correlation, and applied in a parametric study to determine the influence of various beam parameters on the effectiveness of post-tensioning glass beams.

Original languageEnglish
Pages (from-to)233-248
Number of pages16
JournalGlass Structures and Engineering
Volume6
Issue number2
DOIs
Publication statusPublished - Jun 2021
Externally publishedYes

Keywords

  • Analytical model
  • Failure modes
  • Numerical model
  • Parametric study
  • Post-tensioned glass beam
  • Pre-load introduction

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