钢管混凝土叠合柱温度场试验研究  

Experimental study on temperature field of concrete filled steel tube reinforced concrete column

作　　者：项凯[1] 王国辉[1] 

机构地区：[1]公安部天津消防研究所,天津300381

出　　处：《自然灾害学报》2015年第1期133-140,共8页Journal of Natural Disasters

基　　金："十二五"国家科技支撑计划资助项目(2011BAK03B0104);国家自然科学基金资助项目(51408134)

摘　　要：研究了ISO-834标准火灾作用下钢管混凝土叠合柱的温度场。完成了8根叠合柱的火灾试验,考虑因素包括试件截面尺寸、截面类型和含管率。建立了有限元模型,并对试验结果进行参数分析。以方形截面叠合柱为例,分析了火灾时间、受火方式、截面尺寸、长细比、含管率、纵筋配筋率等参数变化对截面温度场的影响规律。火灾时间相同情况下,试验结果表明:(1)含管率相同时,截面尺寸越大,柱内温度越低;(2)截面尺寸相同时,含管率的变化对柱内温度场影响较小;(3)方形截面柱的边长和圆形截面柱的直径相同时,方形截面柱内温度低于圆形截面柱内温度。有限元模型模拟结果表明:火灾时间、截面尺寸和受火方式是影响叠合柱温度场分布的主要因素。The temperature field of concrete filled steel tube reinforced concrete( CFSTRC) column was investigated under ISO- 834 standard fire. Fire tests of eight CFSTRC columns were conducted. The columns investigated had different cross-sectional dimensions,cross-sectional types and different steel tube area ratios. Finite element models( FEM) were developed and used to conduct parametric analysis. Taking square cross section column as an example,influence law of parametric change on its crass-sectional temperature field was analyzed,the parameters investigated includes fire exposure time,fire exposure way,cross-sectional dimension,slenderness ratio,steel tube area ratio and reinforcement ratio. With the same fire exposure time,the experimental results show that:( 1) the larger the cross-sectional dimension,the lower the temperature is inside the specimens under the same steel tube area ratio;( 2) steel tube area ratio has slight influence on temperature field inside the specimens under the same cross-sectional dimension; and( 3) the temperature field of square cross section is lower than that of circular cross section with the same side length and diameter of cross section. The results of FEM simulation show that fire exposure time,cross-sectional dimensions,and fire exposure way are the main factors influencing the temperature field of CFSTRC column.

关 键 词：钢管混凝土 试验 火灾 数值分析 温度场 

分 类 号：TU398.9[建筑科学—结构工程]