Rolling shear capacity of CLT at elevated temperature

Felix Wiesner, Darren Bell, Louis Chaumont, Luke Bisby, Susan Deeny

Research output: Contribution to conferencePaperpeer-review

Abstract

Modern engineered timber products have led to a renewed interest in mass timber as a construction material in mid- and high-rise buildings. Cross-laminated timber (CLT) is produced from timber board layers in alternating directions that are glued together to form slabs or panels. Shear failures along the tangential-radial direction of the cross layers, denoted as rolling shear failures, have been identified as an important ambient temperature failure mode for CLT subjected to out of plane loading, and must therefore be considered in structural design of such CLT elements. However, no studies are currently available on the effects of heating on the rolling shear capacity of timber, creating in a knowledge gap for the safe design of CLT structures in case of fire. This paper presents results and analysis from a series of experiments on CLT samples tested in rolling shear at temperatures between 20 and 200 °C. The samples were heated to steady state thermal conditions within an environmental chamber before displacement controlled loading was applied until failure. An approximately bilinear reduction in rolling shear capacity was observed with increasing temperatures, although this reduction was less severe than that currently suggested by available design guidance. The observed reduction in rolling shear capacity with temperature is used for an example calculation, demonstrating that, in fire, rolling shear failure is unlikely to occur. This is because failure due to exceedance of the normal strength (in bending) governs.

Original languageEnglish
Publication statusPublished - 1 Jan 2018
Event2018 World Conference on Timber Engineering, WCTE 2018 - Seoul, Korea, Republic of
Duration: 20 Aug 201823 Aug 2018

Conference

Conference2018 World Conference on Timber Engineering, WCTE 2018
Country/TerritoryKorea, Republic of
CitySeoul
Period20/08/1823/08/18

Keywords

  • Cross-laminated timber
  • Elevated temperature
  • Rolling shear
  • Structural fire safety

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