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讨论了不同位置喷淋水快速冷却下受限钢梁的力学变化特性,通过相关实验可知:冷却或灭火喷淋水对高温钢结构会产生很大的冲击效应。温度高于6℃与低于5℃的喷淋水对受限高温钢梁产生的受力和变形影响存在明显差异,5℃以下的喷淋水产生的受力和变形特性的最大值要远大于6℃以上喷淋水的作用程度,且要比升温过程产生的受力高1倍以上。冷却位置对结构的受力和变形特性也有影响。一般在右侧梁柱节点处喷水时最大,而在跨中喷水冷却时次之,在梁右侧1/8跨处喷水冷却时最小。受约束钢梁在喷水快速降温过程中,水温变化对结构受力和变形特性的影响程度较大,而水量变化对结构受力和变形特性的影响程度不大。在喷水降温阶段,开始阶段受力和变形特性有所回弹,但仍较大,随着进一步喷水冷却,结构的受力和变形不但不减小,反而增加。
The mechanical characteristics of steel girders subjected to rapid cooling of spray water at different positions are discussed. The relevant experiments show that cooling or fire extinguishing water spray will have a great impact on the structure of high temperature steel. The influence of stress and deformation caused by sprayed water with temperature higher than 6 ℃ and lower than 5 ℃ is obviously different to that of the steel with high temperature, and the maximum value of stress and deformation caused by spray water below 5 ℃ is much larger At 6 ℃ above the role of water spray, and the stress generated by the heating process more than 1 times higher. Cooling locations also have an effect on the force and deformation characteristics of the structure. It is generally the largest when water is sprayed on the right beam and column nodes, followed by water spray in the midspan, and the smallest when sprayed 1/8 water on the right side of the beam. During the rapid cooling process of the confined steel beam, the influence of water temperature on the mechanical properties and deformation characteristics of the structure is greater, while the influence of water quantity on the mechanical and deformation characteristics of the structure is not significant. In the water cooling stage, the initial stage of the force and deformation characteristics of a rebound, but still larger, with further water cooling, the structure of the force and deformation not only does not reduce, but increased.