### Abstract

Original language | English |
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Place of Publication | Espoo |

Publisher | VTT Technical Research Centre of Finland |

Number of pages | 58 |

ISBN (Print) | 951-38-4015-8 |

Publication status | Published - 1991 |

MoE publication type | Not Eligible |

### Publication series

Series | Valtion teknillinen tutkimuskeskus. Tiedotteita |
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Number | 1282 |

ISSN | 0358-5085 |

### Fingerprint

### Keywords

- calculations
- models
- fire resistance
- fire safety
- wooden structures
- timber construction
- beams (supports)
- structural members
- elastic properties
- temperature
- stiffnes
- moisture
- strength
- failure
- bending stress
- shear stress

### Cite this

*Calculation models of wooden beams exposed to fire*. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tiedotteita, No. 1282

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*Calculation models of wooden beams exposed to fire*. Valtion teknillinen tutkimuskeskus. Tiedotteita, no. 1282, VTT Technical Research Centre of Finland, Espoo.

**Calculation models of wooden beams exposed to fire.** / Majamaa, Jarmo.

Research output: Book/Report › Report

TY - BOOK

T1 - Calculation models of wooden beams exposed to fire

AU - Majamaa, Jarmo

PY - 1991

Y1 - 1991

N2 - This study describes a time-to-failure calculation model for wooden beams under a standard fire exposure. The model is based on the linear theory of elasticity by taking the effect of temperature and moisture on the strength and stiffness of the wood into account. The time-to-failure criterion is a tensile failure in a finger joint (a glu-lam beam) or in a knot. The bending and shear stress distributions in the non-charred wooden cross section are calculated analytically by dividing the cross section into several layers with different materia! properties. The bending moment and shear capacity are then calculated by summing the capacities of the layers. Finally, the calculation is compared with test results. Beams are assumed to be of rectangular cross section and exposed to fire on three or four sides. Some earlier calculation methods are briefly reviewed.

AB - This study describes a time-to-failure calculation model for wooden beams under a standard fire exposure. The model is based on the linear theory of elasticity by taking the effect of temperature and moisture on the strength and stiffness of the wood into account. The time-to-failure criterion is a tensile failure in a finger joint (a glu-lam beam) or in a knot. The bending and shear stress distributions in the non-charred wooden cross section are calculated analytically by dividing the cross section into several layers with different materia! properties. The bending moment and shear capacity are then calculated by summing the capacities of the layers. Finally, the calculation is compared with test results. Beams are assumed to be of rectangular cross section and exposed to fire on three or four sides. Some earlier calculation methods are briefly reviewed.

KW - calculations

KW - models

KW - fire resistance

KW - fire safety

KW - wooden structures

KW - timber construction

KW - beams (supports)

KW - structural members

KW - elastic properties

KW - temperature

KW - stiffnes

KW - moisture

KW - strength

KW - failure

KW - bending stress

KW - shear stress

M3 - Report

SN - 951-38-4015-8

T3 - Valtion teknillinen tutkimuskeskus. Tiedotteita

BT - Calculation models of wooden beams exposed to fire

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -