Moisture-induced stresses perpendicular to grain in cross-sections of timber members exposed to different climates

Fragiacomo, Massimo; Fortino, Stefania; Tononi, Davide; Usardi, Irene; Toratti, Tomi

doi:10.1016/j.engstruct.2011.06.018

Cited by 59 publications

(44 citation statements)

References 7 publications

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“…Due to low perpendicular-to-grain tensile strength of wood, longitudinal cracks are frequently observed in timber elements (Frühwald et al 2007). It was also proved by a previous field experiment, which indicated that when glulam elements were exposed to external climate conditions, moisture-induced stresses would exceed the tensile strength of wood in the perpendicular-to-grain direction (Fragiacomo et al 2011).…”

Section: Introductionmentioning

confidence: 83%

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

Dubey¹,

Kute²

2013

Int J Adv Struct Eng

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This paper investigates the mechanical performance of longitudinally cracked glulam columns under eccentric compression loads. Experimental investigation was conducted to explore the influence of initial cracks on the failure modes and load bearing capacity of glulam columns. Two different crack patterns named DC and IC, and two column lengths (i.e. 600 and 1100 mm) were considered in the experiments. It was indicated that these two crack patterns reduced the capacity of slender glulam columns and the difference of failure modes was observed between glulam columns with and without initial cracks. Further, a numerical model was developed and validated by the test results. With the application of cohesive zone material model, the propagation of initial cracks could be considered in the numerical modeling. A parametric study was carried out by the verified model and the influence of crack lengths and crack locations was further investigated. From the numerical analysis, it was found that through cracks reduced the capacity of glulam columns significantly. Also, crack location impacts the capacity of glulam columns and the extent of impact relates to the slenderness ratio of the columns, while cracks with different lengths have similar influence on the capacity of columns.

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Section: Introductionmentioning

confidence: 83%

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

Dubey¹,

Kute²

2013

Int J Adv Struct Eng

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“…The completion of the building envelope and the activation of the floor heating created a large drop in relative humidity (approximately from 60-70% to 30-50%). Since timber with small cross-section strongly reacts to large changes in relative humidity (Niemz 1993, Fragiacomo et al 2011, several humidifiers were installed inside the building in order to avoid a further drop of relative humidity. The humidifiers shifted the relative humidity range from ~30-40% to ~40-50%.…”

Section: Temperature and Relative Humiditymentioning

confidence: 99%

Structural health monitoring of an innovative timber building

Leyder¹,

Chatzi²,

Frangi³

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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A main focus in timber construction research is the development of innovative, sustainable and reliable structures. In order to determine the long-term structural behaviour of these novel structures, structural health monitoring is a valuable tool. In the past two years an innovative timber-hybrid pilot building has been conceived, designed and realized at ETH Zürich. The building contains four innovative structural systems, a post-tensioned timber frame, two timber-concrete hybrid floor systems using beech LVL, and a biaxial pure timber floor in beech wood. In order to fully understand the combined structural behaviour of these innovative systems an extensive monitoring system was set up. The dense sensor network was implemented along with the construction progress, in order to also quantify the effects of important construction stages on the structural behaviour (addition of significant loads, addition of stiffening elements, extreme changes in environmental climate, etc.). The installed setup includes 16 load cells, measuring the changes in the post-tension force in the frame, absolute deformation measurements, temperature and relative humidity sensors, as well as measurements of the moisture content of timber. The monitoring campaign is planned to be continued for several years beyond the completion of construction, in order to quantify the long-term behaviour during the use phase of the building.

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“…También se pueden subdividir en relación con la actividad que tiene lugar en el interior del edificio (Fragiacomo et al, 2011).…”

Section: Clima Exterior Y Humedad De La Maderaunclassified

“…La exposición varía de acuerdo con el clima, y en Fragiacomo et al (2011) sólo se consideran climas europeos, en general estas consideraciones climáticas son a gran escala. Hay una necesidad de investigar la influencia de la humedad en el rendimiento de las estructuras de madera.…”

Section: Figura : Recomendaciones Americanas En Contenidos De Humedadunclassified

“…Sobre la base de la clasificación Köppen-Geiger, se definen nueve regiones climáticas europeas (véase el cuadro 2.3). En Fragiacomo et al (2011) se describe un estudio de las tensiones internas perpendicular a la fibra producidas en la madera por las variaciones de contenido de humedad que son causadas por la exposición a los diferentes climas. Un modelo de elementos finitos tridimensional implementado en Abaqus que combina un modelo de Fick de la transferencia de la humedad y un modelo mecánico para el comportamiento dependiente del tiempo de la madera, y con esto se llevaron a cabo simulaciones numéricas.…”

Section: Figura : Recomendaciones Americanas En Contenidos De Humedadunclassified

See 1 more Smart Citation

Sostenibilidad y durabilidad de elementos estructurales superficiales en base madera : el caso del CLT

Rodríguez¹

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Moisture-induced stresses perpendicular to grain in cross-sections of timber members exposed to different climates

Cited by 59 publications

References 7 publications

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

Experimental investigation on the ultimate strength of partially infilled and steel-braced reinforced concrete frames

Structural health monitoring of an innovative timber building

Sostenibilidad y durabilidad de elementos estructurales superficiales en base madera : el caso del CLT

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