横向荷载作用下钢柱厚型防火涂料破损试验
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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.
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.
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.
引文
[1]董毓利,王德军.框架组合梁抗火性能试验[J].哈尔滨工业大学学报,2008,40(2):178-182.
[2]王卫永,董毓利,李国强.外伸端板节点火灾行为的试验研究和理论分析[J].哈尔滨工业大学学报,2006,38(12):2125-2128.
[3]朱建明,游建平,刘应华,等.简支钢梁抗火设计的优化分析[J].建筑钢结构进展,2008,10(6):31-35.
[4]DAI X H,WANG Y C,BAILEY C G.Effects of par-tial fire protection on temperature developments in steeljoints protected by intumescent coating[J].Fire Safe-ty Journal,20094,4(3):376-386.
[5]陈素文,李国强.地震次生火灾的研究进展[J].2008,17(5):120-126.
[6]PIPES R B,PAGANO N J.Interlaminar stresses incomposite laminates under uniform axial extension[J].Journal of Composite Materials,1970,4:538-548.
[7]阎相桥,杜善义,王铎.复合材料层板的层间应力分析及其应用[J].哈尔滨工业大学学报,1991(3):91-96.
[8]王卫永,李国强.防火涂料和钢板件之间的层间应力[J].广西大学学报:自然科学版,2009,34(4):451-455.
[9]卓杨,许金泉.基于分子动力学的结合材料界面破坏准则[J].力学季刊,2007,28(1):1-7.
[10]TOMECEK D V,MILKE J A.A study of the effect ofpartial loss of protection on the fire resistance of steelcolumns[J].Fire Technology,1993,29(1):4-21.
[11]RYDER N L,WOLIN S D,MILKE J A.An investi-gation of the reduction in fire resistance of steel col-umns caused by loss of spray-applied fire protection[J].Journal of Fire Protection Engineering,200,212(1):31-44.
[12]MILKE J A.Analyses of the impact of loss of spray-applied fire protection on the fire resistance of steelcolumns[C]//EVANS D D.Fire Safety Science—Proceedings of the Seventh International Symposium.Worcester:[s.n.],2003.
[13]KNOBLOCH M,RAVEGLIA E,FONTANA M.Par-tial loss of fire protection and structural collapse ofhigh-rise buildings[C]//International Congress FireSafety in Tall Buildings.Santander:University ofCantabria,2006.
[14]王卫永,李国强,王培军.火灾下防火涂料破损后约束柱的稳定承载力[J].力学季刊,2008,29(1):120-126.
[15]李国强,王卫永,陈素文.火灾下防火涂料破损后钢柱的极限承载力[J].工程力学,2008,25(12):72-78.
[16]LI G Q,WANG W Y,CHEN S W.A simple ap-proach for modeling fire-resistance of steel columnswith locally damaged fire protection[J].EngineeringStructures,2009,31(3):617-622.
[17]王野华.钢结构防火涂料力学性能研究[D].陈素文,指导.上海:同济大学,2007.
[18]张志凌.钢结构防火涂料与钢构件的粘结性能研究[D].陈素文,指导.上海:同济大学,2007.
[2]王卫永,董毓利,李国强.外伸端板节点火灾行为的试验研究和理论分析[J].哈尔滨工业大学学报,2006,38(12):2125-2128.
[3]朱建明,游建平,刘应华,等.简支钢梁抗火设计的优化分析[J].建筑钢结构进展,2008,10(6):31-35.
[4]DAI X H,WANG Y C,BAILEY C G.Effects of par-tial fire protection on temperature developments in steeljoints protected by intumescent coating[J].Fire Safe-ty Journal,20094,4(3):376-386.
[5]陈素文,李国强.地震次生火灾的研究进展[J].2008,17(5):120-126.
[6]PIPES R B,PAGANO N J.Interlaminar stresses incomposite laminates under uniform axial extension[J].Journal of Composite Materials,1970,4:538-548.
[7]阎相桥,杜善义,王铎.复合材料层板的层间应力分析及其应用[J].哈尔滨工业大学学报,1991(3):91-96.
[8]王卫永,李国强.防火涂料和钢板件之间的层间应力[J].广西大学学报:自然科学版,2009,34(4):451-455.
[9]卓杨,许金泉.基于分子动力学的结合材料界面破坏准则[J].力学季刊,2007,28(1):1-7.
[10]TOMECEK D V,MILKE J A.A study of the effect ofpartial loss of protection on the fire resistance of steelcolumns[J].Fire Technology,1993,29(1):4-21.
[11]RYDER N L,WOLIN S D,MILKE J A.An investi-gation of the reduction in fire resistance of steel col-umns caused by loss of spray-applied fire protection[J].Journal of Fire Protection Engineering,200,212(1):31-44.
[12]MILKE J A.Analyses of the impact of loss of spray-applied fire protection on the fire resistance of steelcolumns[C]//EVANS D D.Fire Safety Science—Proceedings of the Seventh International Symposium.Worcester:[s.n.],2003.
[13]KNOBLOCH M,RAVEGLIA E,FONTANA M.Par-tial loss of fire protection and structural collapse ofhigh-rise buildings[C]//International Congress FireSafety in Tall Buildings.Santander:University ofCantabria,2006.
[14]王卫永,李国强,王培军.火灾下防火涂料破损后约束柱的稳定承载力[J].力学季刊,2008,29(1):120-126.
[15]李国强,王卫永,陈素文.火灾下防火涂料破损后钢柱的极限承载力[J].工程力学,2008,25(12):72-78.
[16]LI G Q,WANG W Y,CHEN S W.A simple ap-proach for modeling fire-resistance of steel columnswith locally damaged fire protection[J].EngineeringStructures,2009,31(3):617-622.
[17]王野华.钢结构防火涂料力学性能研究[D].陈素文,指导.上海:同济大学,2007.
[18]张志凌.钢结构防火涂料与钢构件的粘结性能研究[D].陈素文,指导.上海:同济大学,2007.
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