【摘要】：為研究高溫火直接作用下鋼梁的抗火性能,對其進行了高溫火直接作用試驗;同時,以受熱時間作為變化參數(shù),對比分析了高溫火直接作用和按ISO 834標準升溫過程鋼梁的軸力、跨中撓度及耐火時間。結果表明:高溫火直接作用與按ISO834標準升溫下,鋼梁破壞端面的微觀組織及升溫過程的受力和變形存在明顯差異;無論有無防火涂層的保護,當溫度800℃時,高溫火直接作用下鋼梁的最大軸力比按ISO 834標準升溫的增大76.9%以上;同時,防火涂層厚度對鋼梁的耐火時間也有影響,無防火涂層時,鋼梁的耐火時間小于20 min;有防火涂層保護時,隨防火涂層厚度增厚,兩種高溫作用下,鋼梁的耐火時間相近,但防火涂層厚度不足15 mm時,耐火時間相差20%以上;當防火涂層厚度為15 mm時,在溫度約800℃高溫火直接作用下,其耐火時間為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，

本文編號：2281353