Steffen Franke
Bern University of Applied Sciences
Construction engineeringUltimate tensile strengthEngineeringClimate changeCivil engineeringTransverse planeComposite materialMoistureHardening (metallurgy)Geotechnical engineeringMaterials sciencePerpendicularWater contentEquilibrium moisture contentRadiataCompressive strengthMaterial propertiesEnvironmental scienceElastic modulusCross section (physics)Structural engineeringForensic engineeringSpatial variability
33Publications
7H-index
186Citations
Publications 29
Newest
#1Marcus SchiereH-Index: 1
#2Bettina FrankeH-Index: 5
Last. Andreas MüllerH-Index: 5
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Wood is a hygroscopic material that primarily adapts its moisture content to the surrounding relative humidity. The climate in a structure or building depends on the building type and the region the structure is located in. In this study, the effect of region on the moisture content of wood was investigated. Measurements taken in 12 ventilated timber structures were compared to the theoretical equilibrium moisture content calculated from the relative humidity and temperature in 107 meteorologica...
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Abstract The aim of this work is the investigation of mesoscale/local variability in mechanical properties of clear timber in the radial direction. Clear Norway spruce wood, Picea abies, was used for cutting specimens of different lengths with a small cross-sectional area of 4 × 4 mm2, in the radial direction of timber boards, and tested under tensile loading. In some boards, specimens were positioned regularly and, in some others, randomly, and local deformations in each specimen were measured ...
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#1Steffen FrankeH-Index: 2
#1Steffen FrankeH-Index: 7
Last. Bettina FrankeH-Index: 5
view all 2 authors...
#1Bettina Franke (Bern University of Applied Sciences)H-Index: 5
#2Steffen Franke (Bern University of Applied Sciences)H-Index: 7
Last. Andreas Müller (Bern University of Applied Sciences)H-Index: 5
view all 4 authors...
ABSTRACTWood as a hygroscopic material interacts with the ambient climate variations of relative humidity and temperature. Due to constrained volumetric strains, i.e. swelling and shrinkage, changes in moisture content impose moisture induced stresses (MIS) which, if exceeding the tensile stress of the material, can cause fractures such as cracks or delamination. A monitoring campaign was initiated to measure the variations of the climate and moisture content in existing timber bridges and newly...
3 CitationsSource
#1Steffen Franke (Bern University of Applied Sciences)H-Index: 7
#2Bettina Franke (Bern University of Applied Sciences)H-Index: 5
ABSTRACTHardwood is becoming more in focus and more important in timber structures. The natural higher strength increases the potential of timber structures and power to compete with steel or concrete. However, for designing connections, the performance parameters stiffness and load-carrying capacity based on, e.g. embedment strength or withdrawal capacity need to be known but these are less standardized compared to softwood. Since not all types of connections are relevant to be used as high-per...
1 CitationsSource
#1Marcus SchiereH-Index: 1
#2Bettina FrankeH-Index: 5
Last. Steffen FrankeH-Index: 7
view all 3 authors...
#1Steffen FrankeH-Index: 7
#1Steffen FrankeH-Index: 2
Last. Andreas MüllerH-Index: 5
view all 4 authors...
#1Alireza Farajzadeh Moshtaghin (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 2
#2Steffen Franke (Bern University of Applied Sciences)H-Index: 7
Last. Anastasios P. Vassilopoulos (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
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In this study, an experimental campaign was conducted to characterize the length effect on the elasticity and tensile strength of clear spruce wood parallel to the grain direction. Four groups of specimens of different lengths, cut from the same log, were tested under the same conditions under longitudinal tensile loading. The cross-sectional area of the specimens was selected as being constant and sufficiently small to exclude the effect of variations of the properties in the transverse directi...
10 CitationsSource