Long term creep tests on timber beams in heated and non-heated environments

Shankare Gowda, Markku Kortesmaa, Alpo Ranta-Maunus

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

The aim of this research investigation was to study the long term effect of creep on different wood materials under natural environmental conditions. The tests were initiated in the summer of 1992 and the results collected until the end of 1995 are reported here. The experiments on sawn timber of pine and spruce, glulam, Kerto-LVL and I-profile with hardboard web structural size members were carried out in a sheltered environment, where the changes in moisture and temperature of the surrounding followed the natural climatic conditions of Southern Finland. In addition, separate tests on eight glulam beams were carried out in a heated room environment. The experiments were carried out at low load levels (2...7 MPa). The surface of few groups of specimens were treated with alkyd and emulsion paint, some were creosoted and salt impregnated, while few samples had no treatment. The creep test data of all specimens were analysed systematically to obtain creep curves. The data showed significant variation in creep among wood materials with different treatments. Creep of glulam was same in heated and non-heated environment.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages35
ISBN (Print)951-38-4936-8
Publication statusPublished - 1996
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number278
ISSN1235-0621

Fingerprint

Timber
Creep
Wood
Paint
Emulsions
Moisture
Experiments
Salts
Temperature

Keywords

  • construction materials
  • wooden structures
  • structural timber
  • creep properties
  • tests
  • gluelam beams
  • strength
  • loads (forces)
  • moisture

Cite this

Gowda, S., Kortesmaa, M., & Ranta-Maunus, A. (1996). Long term creep tests on timber beams in heated and non-heated environments. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 278
Gowda, Shankare ; Kortesmaa, Markku ; Ranta-Maunus, Alpo. / Long term creep tests on timber beams in heated and non-heated environments. Espoo : VTT Technical Research Centre of Finland, 1996. 35 p. (VTT Publications; No. 278).
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Gowda, S, Kortesmaa, M & Ranta-Maunus, A 1996, Long term creep tests on timber beams in heated and non-heated environments. VTT Publications, no. 278, VTT Technical Research Centre of Finland, Espoo.

Long term creep tests on timber beams in heated and non-heated environments. / Gowda, Shankare; Kortesmaa, Markku; Ranta-Maunus, Alpo.

Espoo : VTT Technical Research Centre of Finland, 1996. 35 p. (VTT Publications; No. 278).

Research output: Book/ReportReport

TY - BOOK

T1 - Long term creep tests on timber beams in heated and non-heated environments

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AU - Kortesmaa, Markku

AU - Ranta-Maunus, Alpo

PY - 1996

Y1 - 1996

N2 - The aim of this research investigation was to study the long term effect of creep on different wood materials under natural environmental conditions. The tests were initiated in the summer of 1992 and the results collected until the end of 1995 are reported here. The experiments on sawn timber of pine and spruce, glulam, Kerto-LVL and I-profile with hardboard web structural size members were carried out in a sheltered environment, where the changes in moisture and temperature of the surrounding followed the natural climatic conditions of Southern Finland. In addition, separate tests on eight glulam beams were carried out in a heated room environment. The experiments were carried out at low load levels (2...7 MPa). The surface of few groups of specimens were treated with alkyd and emulsion paint, some were creosoted and salt impregnated, while few samples had no treatment. The creep test data of all specimens were analysed systematically to obtain creep curves. The data showed significant variation in creep among wood materials with different treatments. Creep of glulam was same in heated and non-heated environment.

AB - The aim of this research investigation was to study the long term effect of creep on different wood materials under natural environmental conditions. The tests were initiated in the summer of 1992 and the results collected until the end of 1995 are reported here. The experiments on sawn timber of pine and spruce, glulam, Kerto-LVL and I-profile with hardboard web structural size members were carried out in a sheltered environment, where the changes in moisture and temperature of the surrounding followed the natural climatic conditions of Southern Finland. In addition, separate tests on eight glulam beams were carried out in a heated room environment. The experiments were carried out at low load levels (2...7 MPa). The surface of few groups of specimens were treated with alkyd and emulsion paint, some were creosoted and salt impregnated, while few samples had no treatment. The creep test data of all specimens were analysed systematically to obtain creep curves. The data showed significant variation in creep among wood materials with different treatments. Creep of glulam was same in heated and non-heated environment.

KW - construction materials

KW - wooden structures

KW - structural timber

KW - creep properties

KW - tests

KW - gluelam beams

KW - strength

KW - loads (forces)

KW - moisture

M3 - Report

SN - 951-38-4936-8

T3 - VTT Publications

BT - Long term creep tests on timber beams in heated and non-heated environments

PB - VTT Technical Research Centre of Finland

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ER -

Gowda S, Kortesmaa M, Ranta-Maunus A. Long term creep tests on timber beams in heated and non-heated environments. Espoo: VTT Technical Research Centre of Finland, 1996. 35 p. (VTT Publications; No. 278).