Duration of load effect on curved glulam beams: Part 2. Long term load tests and analysis

Shankare Gowda, Markku Kortesmaa, Alpo Ranta-Maunus

Research output: Book/ReportReport

3 Citations (Scopus)

Abstract

This research related to the duration of load effect on curved glulam is a part of an EC-AIR project carried out at VTT in co-operation with four other EU member countries. The project includes the long term loading of 32 curved beams, as well as equivalent short term reference tests of 32 beams. The long term loading was made under both constant and cyclically varying humidity conditions. Failure is caused by tensile stress perpendicular to grain. A calculation procedure is presented to consider the effect of moisture variation as an additional loading. Both calculation and experiments reveal that a period of higher humidity can double the effective loading, depending on the duration of humid period. Experimental and calculated results are given for duration of load effect of curved glulam for two thicknesses (90 and 140 mm) under constant (85%) and cyclically changing humidity.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages104
ISBN (Electronic)951-38-5218-0
ISBN (Print)951-38-5212-1
Publication statusPublished - 1998
MoE publication typeNot Eligible

Publication series

SeriesVTT Publications
Number334
ISSN1235-0621

Fingerprint

Atmospheric humidity
Tensile stress
Moisture
Experiments

Keywords

  • wooden structures
  • structural timber
  • glulam beams
  • loads (forces)
  • life (durability)
  • humidity

Cite this

Gowda, S., Kortesmaa, M., & Ranta-Maunus, A. (1998). Duration of load effect on curved glulam beams: Part 2. Long term load tests and analysis. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 334
Gowda, Shankare ; Kortesmaa, Markku ; Ranta-Maunus, Alpo. / Duration of load effect on curved glulam beams : Part 2. Long term load tests and analysis. Espoo : VTT Technical Research Centre of Finland, 1998. 104 p. (VTT Publications; No. 334).
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abstract = "This research related to the duration of load effect on curved glulam is a part of an EC-AIR project carried out at VTT in co-operation with four other EU member countries. The project includes the long term loading of 32 curved beams, as well as equivalent short term reference tests of 32 beams. The long term loading was made under both constant and cyclically varying humidity conditions. Failure is caused by tensile stress perpendicular to grain. A calculation procedure is presented to consider the effect of moisture variation as an additional loading. Both calculation and experiments reveal that a period of higher humidity can double the effective loading, depending on the duration of humid period. Experimental and calculated results are given for duration of load effect of curved glulam for two thicknesses (90 and 140 mm) under constant (85{\%}) and cyclically changing humidity.",
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author = "Shankare Gowda and Markku Kortesmaa and Alpo Ranta-Maunus",
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Gowda, S, Kortesmaa, M & Ranta-Maunus, A 1998, Duration of load effect on curved glulam beams: Part 2. Long term load tests and analysis. VTT Publications, no. 334, VTT Technical Research Centre of Finland, Espoo.

Duration of load effect on curved glulam beams : Part 2. Long term load tests and analysis. / Gowda, Shankare; Kortesmaa, Markku; Ranta-Maunus, Alpo.

Espoo : VTT Technical Research Centre of Finland, 1998. 104 p. (VTT Publications; No. 334).

Research output: Book/ReportReport

TY - BOOK

T1 - Duration of load effect on curved glulam beams

T2 - Part 2. Long term load tests and analysis

AU - Gowda, Shankare

AU - Kortesmaa, Markku

AU - Ranta-Maunus, Alpo

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PY - 1998

Y1 - 1998

N2 - This research related to the duration of load effect on curved glulam is a part of an EC-AIR project carried out at VTT in co-operation with four other EU member countries. The project includes the long term loading of 32 curved beams, as well as equivalent short term reference tests of 32 beams. The long term loading was made under both constant and cyclically varying humidity conditions. Failure is caused by tensile stress perpendicular to grain. A calculation procedure is presented to consider the effect of moisture variation as an additional loading. Both calculation and experiments reveal that a period of higher humidity can double the effective loading, depending on the duration of humid period. Experimental and calculated results are given for duration of load effect of curved glulam for two thicknesses (90 and 140 mm) under constant (85%) and cyclically changing humidity.

AB - This research related to the duration of load effect on curved glulam is a part of an EC-AIR project carried out at VTT in co-operation with four other EU member countries. The project includes the long term loading of 32 curved beams, as well as equivalent short term reference tests of 32 beams. The long term loading was made under both constant and cyclically varying humidity conditions. Failure is caused by tensile stress perpendicular to grain. A calculation procedure is presented to consider the effect of moisture variation as an additional loading. Both calculation and experiments reveal that a period of higher humidity can double the effective loading, depending on the duration of humid period. Experimental and calculated results are given for duration of load effect of curved glulam for two thicknesses (90 and 140 mm) under constant (85%) and cyclically changing humidity.

KW - wooden structures

KW - structural timber

KW - glulam beams

KW - loads (forces)

KW - life (durability)

KW - humidity

M3 - Report

SN - 951-38-5212-1

T3 - VTT Publications

BT - Duration of load effect on curved glulam beams

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Gowda S, Kortesmaa M, Ranta-Maunus A. Duration of load effect on curved glulam beams: Part 2. Long term load tests and analysis. Espoo: VTT Technical Research Centre of Finland, 1998. 104 p. (VTT Publications; No. 334).