In situ assessment of the timber floor structure of the Skansen Lejonet fortification, Sweden

Lechner, Thomas; Nowak, Tomasz; Kliger, Robert

doi:10.1016/j.conbuildmat.2013.12.080

Cited by 32 publications

(23 citation statements)

References 11 publications

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“…Kraler et al (2012) proposed that the nondestructive drilling resistance measurement method can be used to determine the relative density even after damage by fungi and insects has occurred. To assess the general quality of the timber, Lechner et al (2014) applied stress-wave measurements in combination with resistance drilling and X-ray measurements. Lee et al (2014) assessed the residual performance of partially charred components of an old wooden structure by ultrasonic velocity testing and by measurement of drilling resistance.…”

Section: Introductionmentioning

confidence: 99%

Research on residual bending capacities of used wood members based on the correlation between non-destructive testing results and the mechanical properties of wood

Jin

et al. 2015

J. Zhejiang Univ. Sci. A

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Abstract:To quantitatively assess the residual strength of wood members after rot and infestation using non-destructive testing (NDT), the multi-point Resistograph method was applied to test six used wood beams with initial imperfections. Each wood beam was then divided into a shorter segment for mechanical tests and a longer one for bending capacity tests. With the help of finite element analysis using ANSYS, bending capacity is predicted by taking account of the initial imperfections. Results show that there is a significant correlation between drill resistance values and strengths for small specimens. Therefore, the strengths of wood at other measurement points may be obtained through drill resistance values. The beams showed a near linear behaviour up to the maximum load with poor ductility performance in bending capacity tests. It can also be found that the effects of initial imperfections on failure modes and ultimate loads are significant. The lateral side of specimen BA1 has serious infestation and the bottom of BA2 has a long longitudinal crack, the ultimate bearing capacities of these specimens are respectively only 67.6% and 64.8% of BA3, which has fewer cracks. BB1 and BB3 have knots at the bottom and their ultimate bearing capacities are respectively 83.9% and 81.0% of BB2, which has fewer cracks as well. Furthermore, there is quite good agreement between test results and numerical prediction using strength values obtained by NDT results. Therefore, the bending capacity of used wood beams can be obtained using NDT, which can provide the basis for the protection and retrofitting of wood structures.

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Section: Introductionmentioning

confidence: 99%

Research on residual bending capacities of used wood members based on the correlation between non-destructive testing results and the mechanical properties of wood

Jin

et al. 2015

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

show abstract

“…In general, the qualitative radiographs from the investigation of a historical timber floor in Sweden [24] showed that the grain structure of the members was intact at critical sections. Radiographs of connections showed that the connection details were generally in good condition at the inspected locations except at one location where signs of deterioration close to the support structure was found, see Fig.…”

Section: On-site X-ray Investigationsmentioning

confidence: 99%

“…Those aspects are integrated in the single method. These steps from [24] are presented in an overview and results from NDT investigations performed from a timber floor investigation of a historical structure in Sweden are roughly included in this survey.…”

Section: Local Assessmentmentioning

confidence: 99%

“…11 was performed on a historical floor structure in Sweden [24] in the upper and the lower floor, where the measurements for the upper floor showed rather constant velocities for all measurements with a slight decrease near the column, so no signs of degradation/deterioration were captured. In comparison to the upper floor, the lower floor, implied some signs of degradation/deterioration within the support region, where the velocity (3916 m/s) was about 20% lower than the velocity measured for sound members.…”

Section: Stress-wave Timingmentioning

confidence: 99%

“…Comprehensive longitudinal measurements on single element properties and the structural soundness were explored on a historical floor structure in Sweden [24]. The average velocity from the measurements throughout both of the timber floors was 4969 m/s (std.…”

Section: Stress-wave Timingmentioning

confidence: 99%

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