Heiduschke, A. (A.)

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    Analytical assessment of the load carrying capacity of axially loaded wooden reinforced tubes
    (Elsevier, 2010-05-13) Haller, P. (P.); Heiduschke, A. (A.); Cabrero-Ballarín, J.M. (José Manuel)
    As a natural resource, an efficient use of wood should be also a requirement for structural timber design, but the usual structural solid sections do not achieve the required optimal behaviour. The performance of the structural elements (serviceability and strength) depends not only on the material properties, but mainly on the moment of inertia of the cross section. The Timber Construction Institute of Technische Universitát Dresden has developed a process for the manufacture of structural wood profiles. The resulting profiles combine economy, an efficient use of the material and optimal structural performance. They are externally reinforced with composite fibres, which improve the mechanical characteristics of the wood and protect it from weathering. The available experimental tests to axial loading show the outstanding properties of this new technology. Herein, the preliminary model developed to obtain the axial strength of longitudinally compressed tubes is presented. Two different analytical algorithms are discussed and applied. The model adequately predicts the axial strength of fibre reinforced wood profiles. The analytical results are within an error less than 10% to the available experimental results, with a mean error ratio less than 3%.
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    Parametric Analysis of Composite Reinforced Wood Tubes Under Axial Compression
    (2010-06) Haller, P. (P.); Heiduschke, A. (A.); Cabrero-Ballarín, J.M. (José Manuel)
    Wood tubes combine economy, an efficient use of the material and optimal structural performance. They can be optionally reinforced with technical fibers and/or textiles laminated to the outer wood surface. The paper presents the outcomes of a parametric study on the performance of wood reinforced tubes submitted to axial compression. Simple analytical models were applied to estimate the load-carrying capacity of the tubes and their failure mechanisms. Analytical and numerical models were developed to simulate and analyze the load-carrying behavior of the tubes and their failure mechanisms as well as to determine the required lay-up of the reinforcement. Developed analytical models are based on the Classical Laminate Theory in combination of the Tsai-Wu failure criteria. The models were calibrated and verified through the experimental data to assess their reliability. Predicted and experimental failure mechanisms and loads agreed reasonably well. Herein, several parametrical analyses based on the analytical model are presented. However, in the future, more sophisticated analytical models have to be developed and further tests on tubes with varying r/t and l/r ratios are required to verify these models.
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    Diseño y análisis de perfiles estructurales de madera densificada conformada con refuerzos de fibras
    (Sociedad Española de Ciencias Forestales - Junta de Castilla y León, 2009-09-21) Haller, P. (P.); Heiduschke, A. (A.); Cabrero-Ballarín, J.M. (José Manuel)
    La sociedad es cada vez más consciente del valor de los recursos naturales, y por ello demanda un uso eficiente de los mismos. Ése ha de ser también un objetivo al diseñar estructuras de madera. Habitualmente se emplean secciones macizas, circulares o rectangulares, que no obtienen un comportamiento óptimo, y que por tanto no aprovechan al máximo las propiedades y posibilidades de la madera. En el Instituto de Construcción en Madera de la Universidad Tecnológica de Dresde se ha desarrollado un proceso para la fabricación de perfiles estructurales de madera eficientes. Aprovechando el efecto memoria de la madera densificada, paneles de madera se transforman fácilmente en todo tipo de secciones prismáticas, cerradas o abiertas. El perfil resultante combina economía, uso eficiente del material y rendimiento estructural óptimo. Junto con un mínimo refuerzo exterior de fibras, se mejoran las características mecánicas de la madera, y se la protege de las inclemencias atmosféricas. Los perfiles así realizados poseen unas excepcionales características resistentes, como demuestran los ensayos experimentales realizados. Se presenta el modelo desarrollado para el análisis estructural de este nuevo concepto de aplicación de la madera. Basado en teorías clásicas para materiales compuestos, describe adecuadamente el comportamiento estructural de la madera reforzada con fibras: predice con un error inferior al 10% los resultados experimentales.