耐火钢-钢管混凝土柱的防火保护层厚度  

Fire protection thickness of concrete-filled fire-resistant steel tubular columns

作　　者：刘逸祥[1] 童根树[1] 张磊[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2015年第12期2387-2396,共10页Journal of Zhejiang University：Engineering Science

基　　金：国家科技支撑资助项目(2012BAJ13B04)

摘　　要：为了得到火灾中耐火钢-钢管混凝土柱的防火性能,分析特定耐火极限下耐火钢-钢管混凝土柱所需的防火保护层厚度.采用厚涂型钢结构防火涂料、水泥砂浆作为耐火钢圆钢管混凝土柱防火保护层,蒸压加气混凝土板、水泥砂浆作为耐火钢方钢管混凝土柱防火保护层.变化混凝土强度、含钢率、荷载偏心率、钢管尺寸、耐火极限、长细比、钢材强度等参数,利用ANYSY有限元软件分析圆柱、方柱在火灾升温曲线下的温度场.采用数值计算方法求解圆柱、方柱满足特定耐火极限要求时所需的防火保护层厚度,提出3种保护层厚度的实用计算公式.由拟合公式得到的计算结果与理论计算结果的误差较小,可为有关工程的抗火设计提供参考.与普通钢管混凝土柱相比,耐火钢-钢管混凝土柱所需的防火保护层厚度明显较小,约为普通柱所需厚度的1/3~1/2,可节省建筑使用空间.Fire protection thickness of CFT of FR steel was analyzed under certain fire resistances To obtain fireproof performance of concrete-filled steel tube（CFT） of fire-resistant（FR） steel in the fire. Fireproof retardant coating, cement mortar were used as fire protection for CFT of FR steel with circular cross section. And autoclaved aerated concrete slabs, cement mortar were used as fire protection for CFT of FR steel with square cross section. The temperature field of CFT was obtained by ANSYS under different concrete strengths, steel ratios, load eccentricity ratios, sizes, fire resistances, slenderness ratios, steel strengths. The fire protection thickness were solved with numerical technique. The simplified calculation formulas for predicting the thickness were deduced, which was found to be in good agreement with numerical results. The calculation formula can be referenced for the fire protection design of practical engineering. Parametric analyses show that fire protection thickness of CFT of fire-resistant steel decrease significantly compared with CFT of ordinary steel. Therefore, the building space is saved.

关 键 词：耐火钢 钢管混凝土柱 耐火极限 防火保护层厚度 

分 类 号：TU541[建筑科学—建筑技术科学]