【摘要】 为研究钢柱上厚型防火涂料在外力作用下的破坏规律,进行了3个钢柱在外力作用下的防火涂料破损试验,研究H型钢柱上的厚型防火涂料分别在单向加载和往复加载作用下的破坏现象和破坏模式,并对试验结果进行分析.结果表明:防火涂料和界面剂之间以及界面剂和钢板之间的粘结性能差,钢柱受外力作用后粘结很容易破坏.单向加载的钢柱,在受拉翼缘上,初始裂缝间距逐渐加大并会产生新的横向裂缝,柱底部防火涂料脱落;在受压翼缘上,初始干缩裂缝逐渐闭合,柱底的防火涂料被压碎.往复加载的钢柱,粘结更容易破坏.外力作用下,钢柱上防火涂料容易破损,下端翼缘上破损严重,破损模式为大片剥离和脱落,破损程度和柱顶水平荷载有关,腹板上的防火涂料基本完好.更多还原

【Abstract】 To study the failure mode and damage phenomenon of fire retardant coating under monotonous and cyclic load,three experiments were carried out.The experimental results show that the bonding strength is weak between fire retardant coating and steel columns,especially under loaded.For the column monotonously loaded,on the flange with tension,initial cracks on the coating became serious and some new cracks arose.On the flange with compression,the initial cracks closed and the coating on the end of the column was broken down.For the column cyclically loaded,the bond between coating and columns failed more easily.Therefore,the fire retardant coating on steel columns is easily damaged under external force and the damage is serious at the bottom of column.The failure mode is breaking off and falling.The damage area has great relation with the load on top of the column.The coating on the web of column is integrated.更多还原