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适应因子提供了估计温度梯度下钢梁弯曲承载力的简单方法。欧洲的钢结构设计规范中介绍了火灾情况适应因子的应用。由于其他结构或非结构构件进行局部防火保护时,钢或混凝土组合梁内通常会出现温度梯度。当无保护的钢截面存在任何温度梯度时,欧洲规范规定适应因子取值0.7,在同样火灾情况下对有保护的梁适应因子取值0.85,这些值被用于提高钢梁的计算弯曲承载力,此时假定横截面温度均匀。有关适应因子的文献很少。本文对在火灾中,按照欧规对钢梁在不均匀温度场中适应因子的设计取值进行验算。通过各种温度梯度情况的数值计算,对其在钢或混凝土组合梁结构一般情况下的应用进行了研究。并对规范所采纳的适应因子值的稳定性进行讨论并给出了推荐值。
The adaptation factor provides a simple way to estimate the bending capacity of a steel beam under a temperature gradient. The European steel design code describes the application of fire condition adaptation factors. Temperature gradients usually occur in steel or concrete composite beams due to partial fire protection of other structures or non-structural components. Where there is any temperature gradient in the unprotected section of steel, the European Code states that the fitness factor is taken as 0.7 and that the fitted beam adaptation factor is taken as 0.85 for the same fire, these values being used to increase the calculated flexural capacity of the steel beam , Assuming uniform cross-section temperature. There is little literature on adaptation factors. In this paper, in the fire, in accordance with European regulations on the steel beam in the uneven temperature field to adapt to the factor design value checking. Through the numerical calculation of various temperature gradients, its application in the general case of steel or concrete composite beam structure was studied. And discusses the stability of the fitness factor values adopted by the norms and gives the recommended values.