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Behaviour of creep of timber beams under natural environmental conditions

机译：木梁在自然环境条件下的蠕变行为

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The current research is devoted to the investigation of relationships in creep behaviour of timber beams under natural environmental conditions with the purpose of detecting the factors significantly affecting such parameters as the variable moisture content of wood, temperature, stress level, span-depth ratio, macrostructure of wood and other factors, and to establish a mathematical model applicable for determining parameters related to prognosis of deflection of timber beams under variable loads. This study includes the analysis of experimental test results in static bending of 17 softwood (Pinus Sylvestris L.) beams with different span and span/depth ratios regarding a variation of moisture content, relative humidity and air temperature. The mathematical model examined in this study for the description of creep has been developed on the basis of the Burger body concept. A sufficiently good compatibility of average experimental and modelled strain values of timber beams was observed in the results. These results testify that the developed creep model may be used for predicting deformation of timber beams, and constants involved are applicable for natural environmental conditions. This study is part of extensive research that is aimed at contributing to the determination of accurate model parameters and to establishing an adequate and practically applicable mathematical model for more accurate predictions of final deflection of timber beams for design purposes.
机译：当前的研究致力于研究自然环境条件下木梁的蠕变行为之间的关系，目的是检测显着影响诸如木材的可变含水量，温度，应力水平，跨深比，宏观结构等参数的因素。木材和其他因素的影响，并建立适用于确定与可变载荷下木梁挠度预后相关的参数的数学模型。这项研究包括对17种针叶木（Pinus Sylvestris L.）梁进行静态弯曲的实验分析，这些梁具有不同的跨度和跨度/深度比，涉及湿度，相对湿度和气温的变化。在这项研究中检验的用于描述蠕变的数学模型是根据Burger body概念开发的。结果表明，木梁的平均实验值和模型应变值具有足够好的兼容性。这些结果证明，所开发的蠕变模型可用于预测木梁的变形，并且所涉及的常数适用于自然环境条件。这项研究是广泛研究的一部分，旨在为确定准确的模型参数做出贡献，并为设计目的而建立适当且实际适用的数学模型，以更准确地预测木梁的最终挠度。

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