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Full-Scale Ultimate-Load Test of a Stress-Laminated-Timber Bridge Deck

Ekholm, K.; Kliger, R. and Crocetti, Roberto LU (2012) In Journal of Bridge Engineering 17(4). p.691-699
Abstract
A general assumption reported in the literature is that the structural response of a stress-laminated-timber (SLT) bridge deck is linear until failure. However, few studies of ultimate-load tests (ULTs) on timber bridges have been reported. A full-scale test of a SLT deck (span, 4.9 m; thickness, 270 mm) was performed to obtain the deformations at various prestress levels as well as at the ultimate-load capacity of such a structure. Prior to the ULT, nondestructive tests (NDT) were performed at three different prestress levels. The load was applied as an axle load positioned both centrically and eccentrically. The deflections were about 10% larger at a prestress level of 300 kPa compared with a prestress level of 600 and 900 kPa. For... (More)
A general assumption reported in the literature is that the structural response of a stress-laminated-timber (SLT) bridge deck is linear until failure. However, few studies of ultimate-load tests (ULTs) on timber bridges have been reported. A full-scale test of a SLT deck (span, 4.9 m; thickness, 270 mm) was performed to obtain the deformations at various prestress levels as well as at the ultimate-load capacity of such a structure. Prior to the ULT, nondestructive tests (NDT) were performed at three different prestress levels. The load was applied as an axle load positioned both centrically and eccentrically. The deflections were about 10% larger at a prestress level of 300 kPa compared with a prestress level of 600 and 900 kPa. For applied loads larger than 150-250 kN, the deflection of the deck was nonlinear at certain positions. This was most likely owing to large concentrated shear forces that resulted in interlaminar slip between the laminates. The limit for linearity seems to be dependent on the applied prestress. A prestress of 600 kPa and an eccentrically positioned load was used for the ULT. Failure occurred at a load level of 900 kN. The existing design codes and new procedures in development may be verified and calibrated against the results in this paper. DOI: 10.1061/(ASCE)BE.1943-5592.0000304. (C) 2012 American Society of Civil Engineers. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Stress-laminated-timber, SLTD, Timber bridge, Ultimate load test, Interlaminar slip
in
Journal of Bridge Engineering
volume
17
issue
4
pages
691 - 699
publisher
American Society of Civil Engineers (ASCE)
external identifiers
  • wos:000312660700015
  • scopus:84876253956
ISSN
1943-5592
DOI
10.1061/(ASCE)BE.1943-5592.0000304
language
English
LU publication?
yes
id
c8f45359-43bc-4486-b241-5b20bb8e4731 (old id 3512375)
date added to LUP
2013-02-21 11:05:23
date last changed
2017-01-01 03:54:50
@article{c8f45359-43bc-4486-b241-5b20bb8e4731,
  abstract     = {A general assumption reported in the literature is that the structural response of a stress-laminated-timber (SLT) bridge deck is linear until failure. However, few studies of ultimate-load tests (ULTs) on timber bridges have been reported. A full-scale test of a SLT deck (span, 4.9 m; thickness, 270 mm) was performed to obtain the deformations at various prestress levels as well as at the ultimate-load capacity of such a structure. Prior to the ULT, nondestructive tests (NDT) were performed at three different prestress levels. The load was applied as an axle load positioned both centrically and eccentrically. The deflections were about 10% larger at a prestress level of 300 kPa compared with a prestress level of 600 and 900 kPa. For applied loads larger than 150-250 kN, the deflection of the deck was nonlinear at certain positions. This was most likely owing to large concentrated shear forces that resulted in interlaminar slip between the laminates. The limit for linearity seems to be dependent on the applied prestress. A prestress of 600 kPa and an eccentrically positioned load was used for the ULT. Failure occurred at a load level of 900 kN. The existing design codes and new procedures in development may be verified and calibrated against the results in this paper. DOI: 10.1061/(ASCE)BE.1943-5592.0000304. (C) 2012 American Society of Civil Engineers.},
  author       = {Ekholm, K. and Kliger, R. and Crocetti, Roberto},
  issn         = {1943-5592},
  keyword      = {Stress-laminated-timber,SLTD,Timber bridge,Ultimate load test,Interlaminar slip},
  language     = {eng},
  number       = {4},
  pages        = {691--699},
  publisher    = {American Society of Civil Engineers (ASCE)},
  series       = {Journal of Bridge Engineering},
  title        = {Full-Scale Ultimate-Load Test of a Stress-Laminated-Timber Bridge Deck},
  url          = {http://dx.doi.org/10.1061/(ASCE)BE.1943-5592.0000304},
  volume       = {17},
  year         = {2012},
}