高温火直接作用下钢梁抗火性能试验研究
发布时间：2018-10-19 14:02
【摘要】：为研究高温火直接作用下钢梁的抗火性能,对其进行了高温火直接作用试验;同时,以受热时间作为变化参数,对比分析了高温火直接作用和按ISO 834标准升温过程钢梁的轴力、跨中挠度及耐火时间。结果表明:高温火直接作用与按ISO834标准升温下,钢梁破坏端面的微观组织及升温过程的受力和变形存在明显差异;无论有无防火涂层的保护,当温度800℃时,高温火直接作用下钢梁的最大轴力比按ISO 834标准升温的增大76.9%以上;同时,防火涂层厚度对钢梁的耐火时间也有影响,无防火涂层时,钢梁的耐火时间小于20 min;有防火涂层保护时,随防火涂层厚度增厚,两种高温作用下,钢梁的耐火时间相近,但防火涂层厚度不足15 mm时,耐火时间相差20%以上;当防火涂层厚度为15 mm时,在温度约800℃高温火直接作用下,其耐火时间为26 min。
[Abstract]:In order to study the fire resistance of steel beam under the direct action of high temperature fire, the direct action test of high temperature fire was carried out, and the axial force of steel beam during heating process according to ISO 834 standard was compared and analyzed with heating time as the variable parameter. Cross-center deflection and fireproof time. The results show that there are obvious differences between the direct action of high temperature fire and the temperature rise according to ISO834 standard, the microstructure of the failure end surface of steel beam, the stress and deformation of the heating process, whether or not the fire resistant coating is protected, when the temperature is 800 鈩，
本文编号：2281353
[Abstract]:In order to study the fire resistance of steel beam under the direct action of high temperature fire, the direct action test of high temperature fire was carried out, and the axial force of steel beam during heating process according to ISO 834 standard was compared and analyzed with heating time as the variable parameter. Cross-center deflection and fireproof time. The results show that there are obvious differences between the direct action of high temperature fire and the temperature rise according to ISO834 standard, the microstructure of the failure end surface of steel beam, the stress and deformation of the heating process, whether or not the fire resistant coating is protected, when the temperature is 800 鈩，
本文编号：2281353
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