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Publications (6 of 6) Show all publications
Serrano, E., Enquist, B. & Vessby, J. (2014). Long term in-situ measurements of displacement, temperature and relative humidity in a multi storey residential CLT building. In: WCTE 2014 - World Conference on Timber Engineering, Proceedings: . Paper presented at World Conference on Timber Engineering, Quebuec City, 10-14 August (pp. 398-405). World Conference on Timber Engineering (WCTE)
Open this publication in new window or tab >>Long term in-situ measurements of displacement, temperature and relative humidity in a multi storey residential CLT building
2014 (English)In: WCTE 2014 - World Conference on Timber Engineering, Proceedings, World Conference on Timber Engineering (WCTE) , 2014, p. 398-405Conference paper, Published paper (Refereed)
Abstract [en]

In a multi-storey residential housing project comprising of four 8-storey timber buildings, the bottom storeybeing designed with concrete and storeys 2-8 in timber, the vertical relative displacement, the temperature and the relativehumidity (RH) along one vertical channel in the external wall of one building has been monitored. Measurements startedduring construction and presented herein are results of 6.5 years of in-situ measurements. Displacement data was monitoredstorey-by-storey, with a sampling frequency of 1 measurement every 10-60 minutes. In another of the four buildingsadditional temperature and relative humidity measurements have been ongoing for about 5.5 years. These temperature andRH measurements were performed at six different locations in the building, at each location in eight positions through theexterior wall with a sampling frequency of 1 measurement every 15 minutes. The results show that the total verticaldisplacement over six storeys after 6.5 years of service life is approximately 23 mm as a yearly average, and over the yearthe displacement varies from this value by approximately ±2 mm. The main cause for the relative displacement is thedecrease of moisture content in the wood material leading to shrinkage after completion of the building. The resultsobtained show also that the exterior wall design of the building behaves well in terms of not comprising a general risk fordamp or mould in the timber core of the external walls.

Place, publisher, year, edition, pages
World Conference on Timber Engineering (WCTE), 2014
Keywords
CLT, long term displacement, relative humidity, temperature, in-situ measurement
National Category
Other Civil Engineering Building Technologies
Identifiers
urn:nbn:se:kau:diva-74389 (URN)2-s2.0-84924957543 (Scopus ID)
Conference
World Conference on Timber Engineering, Quebuec City, 10-14 August
Available from: 2014-05-28 Created: 2019-08-28Bibliographically approved
Serrano, E., Vessby, J. & Olsson, A. (2012). Modeling of fracture in the sill plate in partially anchored shear walls. Journal of Structural Engineering, 138(10), 1285-1288
Open this publication in new window or tab >>Modeling of fracture in the sill plate in partially anchored shear walls
2012 (English)In: Journal of Structural Engineering, ISSN 0733-9445, E-ISSN 1943-541X, Vol. 138, no 10, p. 1285-1288Article in journal (Refereed) Published
Abstract [en]

This study relates to the topic of anchorage of shear walls. At times, eccentric forces between the sheathing and the anchoring devices may be introduced in the sill plate. In severe cases, such forces may cause the sill plate to split and to fail in a brittle manner. In this study, fracture mechanics are applied to develop a simple closed-form hand-calculation expression for estimation of the ultimate load capacity of the sill plate. Finite-element analyses using both linear elastic fracture mechanics (LEFM) theory and a nonlinear fictitious crack model are also used to predict the ultimate load-bearing capacity of the sill plate. The hand-calculation model is compared with the finite-element models, and good agreement is obtained. The results obtained with the various fracture mechanics models are compared with results available from previously performed experimental tests, and again good agreement is obtained. A general conclusion is that the LEFM theory is an adequate approach for the case studied and that the hand-calculation expression developed could be useful for structural design.

Place, publisher, year, edition, pages
Reston, VA: American Society of Civil Engineers (ASCE), 2012
Keywords
timber construction, cracking, shear walls, anchorage, finite element method, plates
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74391 (URN)10.1061/(ASCE)ST.1943-541X.0000548 (DOI)2-s2.0-84873381940 (Scopus ID)
Available from: 2012-11-07 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
Vessby, J., Serrano, E., Olsson, A., Girhammar, U. A. & Källsner, B. (2012). Simulation of bottom rail fracture in partially anchored shear walls using XFEM. In: INTERNATIONAL COUNCIL FOR RESEARCH AND INNOVATIONIN BUILDING AND CONSTRUCTION, WORKING COMMISSION W18 - TIMBER STRUCTURES (CIB-W18): Meeting forty-five, Växjö, Sweden, August 2012. Paper presented at CIB-W18.
Open this publication in new window or tab >>Simulation of bottom rail fracture in partially anchored shear walls using XFEM
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2012 (English)In: INTERNATIONAL COUNCIL FOR RESEARCH AND INNOVATIONIN BUILDING AND CONSTRUCTION, WORKING COMMISSION W18 - TIMBER STRUCTURES (CIB-W18): Meeting forty-five, Växjö, Sweden, August 2012, 2012Conference paper, Published paper (Refereed)
Keywords
fracture, shear wall, bottom rail, XFEM
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74405 (URN)
Conference
CIB-W18
Available from: 2014-03-31 Created: 2019-08-16Bibliographically approved
Vessby, J., Serrano, E. & Enquist, B. (2010). Contact-free measurement and numerical and analytical evaluation of the strain distribution in a wood-FRP lap-joint. Materials and Structures, 43(8), 1085-1095
Open this publication in new window or tab >>Contact-free measurement and numerical and analytical evaluation of the strain distribution in a wood-FRP lap-joint
2010 (English)In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 43, no 8, p. 1085-1095Article in journal (Refereed) Published
Abstract [en]

Wood specimens to each of which alaminate of carbon fibre reinforcement polymers(FRP) was glued (creating a lap joint in each case)were loaded to failure. A total of 15 specimens ofthree types differing in the glued length (anchoragelength) of the FRP laminate (50, 150 and 250 mmrespectively) were tested, their strength, stiffness andstrain distribution being evaluated. Synchronizeddigital cameras (charge-coupled devices) used intesting enabled strain fields on surfaces they weredirected at during the loading procedure to bemeasured. These results were also evaluated bothanalytically on the basis of generalized Volkersentheory and numerically by use of the finite elementmethod. The lap joints showed a high level ofstiffness as compared with mechanical joints. A highdegree of accuracy in the evaluation of stiffness wasachieved through the use of the contact-free evaluationsystem. The load-bearing capacity of joints ofthis type was found to be dependent upon theanchorage length in a non-linear fashion. The experimental,analytical and numerical results were shownto be in close agreement with respect to the strengthand the strain distribution obtained.

Place, publisher, year, edition, pages
Springer, 2010
Keywords
FRP Lap-joint Volkersen Wood
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74403 (URN)10.1617/s11527-009-9568-x (DOI)
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-21Bibliographically approved
Vessby, J., Serrano, E. & Olsson, A. (2010). Coupled and uncoupled nonlinear elastic finite element models formonotonically loaded sheathing-to-framing joints in timber based shear walls. Engineering structures, 32(11), 3433-3442
Open this publication in new window or tab >>Coupled and uncoupled nonlinear elastic finite element models formonotonically loaded sheathing-to-framing joints in timber based shear walls
2010 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 32, no 11, p. 3433-3442Article in journal (Refereed) Published
Abstract [en]

Four different elastic models for sheathing-to-framing connections are presented and evaluated on asingle connection level and on a shear wall level. Since the models are elastic in their nature they aresuitable mainly for cases where the sheathing-to-framing connections are subjected to monotonicallyincreasing displacements. Of the four models one is uncoupled and the others are coupled with respect tothe two perpendicular displacement directions in a two-dimensional model. Two of the coupled modelsare non-conservative, while the third is conservative, indicating a path independency with respect to thework done to reach a defined state of deformation. When the different models are compared it is obviousthat the uncoupled model gives strength and stiffness values higher than the others; however it is notobvious which of the models to use in a shear wall analysis, each of the models having its advantages anddisadvantages. For the experimental data used as input in the analyses of this study however, a couplednon-conservative model seems the most appropriate.

Place, publisher, year, edition, pages
Elsevier, 2010
Keywords
Shear walls, Coupled model, Sheathing-to-framing joint, Finite element method
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74404 (URN)10.1016/j.engstruct.2010.05.018 (DOI)2-s2.0-77957304222 (Scopus ID)
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-21Bibliographically approved
Serrano, E., Enquist, B. & Vessby, J. (2010). Vertical relative displacements in a medium-rise CLT-building. In: Paulo J.S. Cruz (Ed.), Structures and Architecture: Proceedings of the First International Conference and Architectures, ICSA. Paper presented at Structures and Architecture, Guimaraes, July 2010 (pp. 388-395). Taylor & Francis
Open this publication in new window or tab >>Vertical relative displacements in a medium-rise CLT-building
2010 (English)In: Structures and Architecture: Proceedings of the First International Conference and Architectures, ICSA / [ed] Paulo J.S. Cruz, Taylor & Francis, 2010, p. 388-395Conference paper, Published paper (Refereed)
Abstract [en]

Four buildings with clt-panels in their load bearing structure were built at the block Limnologen in Växjö, Southern Sweden. Their architecture is an example of the new ar-chitecture possible with this building system. Properties of these new structures are sought, one of these being their relative vertical displacement over time. These displacements are measured continuously for six storeys, up to now for just over two years. So far, the total measured dis-placements have reached a maximum of 21.1 mm over the 17.95 meter measuring length. Annu-lar variations of the displacements corresponding to the varying climate may be observed in the data.

Place, publisher, year, edition, pages
Taylor & Francis, 2010
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:kau:diva-74390 (URN)10.1201/b10428 (DOI)978-0-415-49249-2 (ISBN)
Conference
Structures and Architecture, Guimaraes, July 2010
Available from: 2019-08-28 Created: 2019-08-28 Last updated: 2019-11-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5333-0682

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