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Bärförmåga för KL-trä med urtag - Provning och beräkningsmetoder

Friberg, Axel (2017)
LTH School of Engineering in Helsingborg
Abstract
Cross-laminated timber (CLT) is a wood material that is often used as load-carrying element in multi-storey buildings (with more than two floors) with wooden frame. Sometimes it is necessary to make notches in load-carrying elements in order to create space for installations. Today there are no instructions regarding how to design CLT in Eurocode. Design of CLT can instead be based on European technical assessments (ETA) from producers of CLT, accompanied with advice and recommendations, and different available manuals and handbooks. In these sources there are also two recommendations for design of CLT with notches, both based on the calculation method present in Eurocode 5, and intended for structural timber, LVL and glulam. The focus of... (More)
Cross-laminated timber (CLT) is a wood material that is often used as load-carrying element in multi-storey buildings (with more than two floors) with wooden frame. Sometimes it is necessary to make notches in load-carrying elements in order to create space for installations. Today there are no instructions regarding how to design CLT in Eurocode. Design of CLT can instead be based on European technical assessments (ETA) from producers of CLT, accompanied with advice and recommendations, and different available manuals and handbooks. In these sources there are also two recommendations for design of CLT with notches, both based on the calculation method present in Eurocode 5, and intended for structural timber, LVL and glulam. The focus of this report has been to evaluate these calculation methods by comparing them to test results. Beams made out of CLT with notches of different heights have been tested in a servo-hydraulic testing machine, which has registered the relation between force and deformation. The failure loads acquired from these tests have then been compared with the calculated failure loads acquired from using the calculation method for notches, mentioned above. The results show that CLT-beams with notches have a load-carrying capacity larger than what the calculations show, even if the calculations are based on characteristic strength values and other nominal values. However, the ratio between the calculated and the failure loads found from tests are relatively constant between the different notch heights, which suggests that the calculation method can be used, but that it should be adjusted to reflect the real load-carrying capacity of CLT with notches. (Less)
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author
Friberg, Axel
organization
year
type
M2 - Bachelor Degree
subject
keywords
kl-trä, korslimmat, massivträ, korslimmat massivträ, korslimmat trä, urtag, clt, cross-laminated timber, notch, provning, beräkningsmetod, eurokod
language
Swedish
id
8918999
date added to LUP
2017-06-27 04:10:45
date last changed
2018-10-18 10:36:32
@misc{8918999,
  abstract     = {Cross-laminated timber (CLT) is a wood material that is often used as load-carrying element in multi-storey buildings (with more than two floors) with wooden frame. Sometimes it is necessary to make notches in load-carrying elements in order to create space for installations. Today there are no instructions regarding how to design CLT in Eurocode. Design of CLT can instead be based on European technical assessments (ETA) from producers of CLT, accompanied with advice and recommendations, and different available manuals and handbooks. In these sources there are also two recommendations for design of CLT with notches, both based on the calculation method present in Eurocode 5, and intended for structural timber, LVL and glulam. The focus of this report has been to evaluate these calculation methods by comparing them to test results. Beams made out of CLT with notches of different heights have been tested in a servo-hydraulic testing machine, which has registered the relation between force and deformation. The failure loads acquired from these tests have then been compared with the calculated failure loads acquired from using the calculation method for notches, mentioned above. The results show that CLT-beams with notches have a load-carrying capacity larger than what the calculations show, even if the calculations are based on characteristic strength values and other nominal values. However, the ratio between the calculated and the failure loads found from tests are relatively constant between the different notch heights, which suggests that the calculation method can be used, but that it should be adjusted to reflect the real load-carrying capacity of CLT with notches.},
  author       = {Friberg, Axel},
  keyword      = {kl-trä,korslimmat,massivträ,korslimmat massivträ,korslimmat trä,urtag,clt,cross-laminated timber,notch,provning,beräkningsmetod,eurokod},
  language     = {swe},
  note         = {Student Paper},
  title        = {Bärförmåga för KL-trä med urtag - Provning och beräkningsmetoder},
  year         = {2017},
}