Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Long-term bending stress relaxation in timber laths for the structural design of lattice shells
Year:2018
Research Areas
  • Civil engineering and architecture
Information
Abstract
Timber lattice shells are multi-layered structures of great interest for medium and long span lightweight solutions in structural and aesthetic terms. They are constructed by bending initially straight laths. This curving process can lead to high initial stresses in the laths and the possibility of overstressing under service loads. However, these initial stresses may decrease over time to acceptable levels due to the stress relaxation phenomenon. The quantification of stress relaxation over the long-term is therefore a key aspect in the structural analysis of lattice shells. Unfortunately, no information is given in the standards and the available experimental data comes from short-term research, so that engineers have to make assumptions which are not properly verified. This work provides experimental results on long-term bending stress relaxation curves of dry Eucalyptus globulus L. laths bent with three different curvature radii (different stress levels) over two years. For this purpose an original test device was developed and used, overcoming the drawbacks of the other devices used to date in most experimental research. Initial bending stresses decreased very quickly during the first weeks of measurements. After two years, the bending stresses fell by from 45% to 66% of their initial values depending on their curvature radii, which implies an important structural reserve recovery.
International
Si
JCR
Si
Title
Construction And Building Materials
ISBN
0950-0618
Impact factor JCR
4,046
Impact info
JCR (2018): Q1 (mitad superior)
Volume
193
10.1016/j.conbuildmat.2018.10.224
Journal number
From page
565
To page
575
Month
SIN MES
Ranking
Participants
  • Autor: Antonio Jose Lara Bocanegra (UPM)
  • Autor: Maria Almudena Majano Majano (UPM)
  • Autor: Francisco Arriaga Martitegui (UPM)
  • Autor: Manuel Guaita (Universidad de Santiago de Compostela)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Estructuras y Física de Edificación
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)