Design of post-tensioned timber beams for fire resistance (2012)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Civil and Natural Resources Engineering
This paper describes a series of three full-scale furnace tests on post-tensioned LVL box beams loaded with vertical loads, and presents a proposed fire design method for post-tensioned timber members. The design method is adapted from the calculation methods given in Eurocode 5 and NZS:3603 which includes the effects of changing geometry and several failure mechanisms specific to post-tensioned timber. The design procedures include an estimation of the heating of the tendons within the timber cavities, and relaxation of post-tensioning forces. Additionally, comparisons of the designs and assumptions used in the proposed fire design method and the results of the full-scale furnace tests are made. The experimental investigation and development of a design method have shown several areas which need to be addressed. It is important to calculate shear stresses in the timber section, as shear is much more likely to govern compared to solid timber. The investigation has shown that whilst tensile failures are less likely to govern the fire design of post-tensioned timber members, due to the axial compression of the post-tensioning, tensile stresses must still be calculated due to the changing centroid of the members as the fire progresses. Research has also highlighted the importance of monitoring additional deflections and moments caused by the high level of axial loads.
CitationSpellman, P.M., Abu, A.K., Carradine, D.M., Moss, P.J., Buchanan, A.H. (2012) Design of post-tensioned timber beams for fire resistance. Zurich, Switzerland: 7th International Conference on Structures in Fire (SiF), 6-8 Jun 2012. SiF2012, 317-326.
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Keywordsstructural fire engineering; fire engineering; timber structures; post-tensioned timber; fire performance; furnace test; design
ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400504 - Construction engineering
40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
40 - Engineering::4016 - Materials engineering::401610 - Timber, pulp and paper
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Spellman, P.; Carradine, D.; Abu, A.; Moss, P.; Buchanan, A. (University of Canterbury. Civil and Natural Resources Engineering, 2012)This paper describes a series of full-scale furnace tests on loaded post tensioned LVL beams. Each beam was designed to exhibit a specific failure mechanism when exposed to the standard ISO834 fire. In addition to the beams ...
Quiquero H; Gales J; Abu A; Moss P (2018)In order to implement innovative timber structures globally, performance-based design using numerical models are often required. A model was developed to simulate post-tensioned (PT) timber beams in FEM software ABAQUS ...
Smith, T.; Wong, R.; Newcombe, M.; Carradine, D.; Pampanin, Stefano; Buchanan, A.; Seville, R.; McGregor, E. (University of Canterbury. Civil and Natural Resources Engineering, 2011)This paper outlines the deconstruction, redesign and reconstruction of a 2 storey timber building at the University of Canterbury, in Christchurch, New Zealand. The building consists of post tensioned timber frames and ...