钢材虽不是燃烧体，却易导热，怕火烧，随着温度的升高，钢材的机械力学，诸如屈服点、抗压强度、弹性模量及承载力等都迅速下降。在火焰作用下无保护措施的裸露钢结构约15-25min即可市区承载能力，不锈钢网架钢结构不可避免地扭曲变形，导致结构垮塌毁坏。因此，做好钢结构的防火工作具有重要的经济和社会意义。不锈钢网架钢结构防火保护之防火措施：目前国内外常用的防火措施主要由防火涂料和构造防火两种类型。
Although steel is not a combustible material, it is easy to conduct heat and is afraid of fire. As the temperature increases, the mechanical properties of steel, such as yield point, compressive strength, elastic modulus, and bearing capacity, rapidly decrease. Exposed steel structures without protective measures under the action of flames can bear the urban load for about 15-25 minutes, and stainless steel grid steel structures inevitably twist and deform, leading to structural collapse and destruction. Therefore, doing a good job in fire prevention of steel structures has important economic and social significance. Fire protection measures for stainless steel grid steel structures: Currently, the commonly used fire protection measures at home and abroad mainly include two types: fire retardant coatings and structural fire protection.
1、防火涂料对室内裸露钢结构、轻型屋盖钢结构及有装饰要求的钢结构，当规定其耐火在1.5h以下时，应选用薄涂型钢结构防火材料。室内隐蔽钢结构、高层钢结构及多层厂房钢结构，当其规定耐火在1.5h以上时，应选用厚涂型钢结构防火涂料。
1. When the fire resistance of exposed indoor steel structures, light roof steel structures, and steel structures with decorative requirements is specified to be below 1.5 hours, thin coated steel structure fire resistant materials should be selected. When the specified fire resistance of indoor concealed steel structures, high-rise steel structures, and multi-layer factory steel structures is above 1.5 hours, thick coated steel structure fire retardant coatings should be used.
2、构造防火钢结构构件的防火构造可分为外包混凝土材料、外包钢丝网水泥砂浆、外包防火板材，外喷防火涂料等几种构造形式。
2. The fireproof construction of fire-resistant steel structural components can be divided into several forms, such as outsourcing concrete materials, outsourcing steel wire mesh cement mortar, outsourcing fireproof boards, and spraying fireproof coatings.
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