钢管混凝土异形柱耐火性能试验及防火保护层厚度计算方法研究  

RESEARCH ON FIRE RESISTANCE AND ON CALCULATION METHODFOR FIRE PROTECTION THICKNESS OF SPECIAL-SHAPEDCONCRETE-FILLED STEEL TUBULAR(CFST)COLUMNS

作　　者：卫璇 杨远龙 刘界鹏[2,3] 王卫永[3] 杨伟棋 WEI Xuan;YANG Yuan-long;LIU Jie-peng;WANG Wei-yong;YANG Wei-qi(College of Computer Science,Chongqing University,Chongqing 400045,China;Institute for Smart City of Chongqing University in Liyang,Chongqing University,Liyang 213300,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学计算机学院,重庆400045 [2]重庆大学溧阳智慧城市研究院,溧阳213300 [3]重庆大学土木工程学院,重庆400045

出　　处：《工程力学》2023年第5期204-216,256,共14页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51878098);重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0580)。

摘　　要：为了研究钢管混凝土异形柱在偏心荷载作用下防火保护层厚度的计算方法,设计加工了6个多腔式钢管混凝土异形柱试件,研究参数包括截面形状和防火保护层厚度,防火保护层采用非膨胀型防火涂料。通过耐火性能试验研究了试件的破坏形态、温度场分布和耐火极限。结果表明:钢管混凝土异形柱各腔室受火面数量越多,混凝土中心温度越高;防火涂料厚度相同时,截面形状对试件耐火极限影响较小;当防火涂料厚度大于16 mm时,文中试件可达到一级耐火等级的要求。基于有限元软件ABAQUS分别建立了温度场和热力耦合分析模型,有限元结果和试验结果吻合良好。在不同防火涂料厚度下进行了参数分析,发现荷载比(n)和混凝土强度(f_(ck))对有无防火涂料试件耐火极限的比值(t_(e)/t_(0))影响较大,基于参数分析结果提出了钢管混凝土异形柱在偏心荷载作用下防火涂料厚度的设计方法。To investigate the calculation method for the fire protection thickness of special-shaped concrete-filled steel tubular(CFST)columns subjected to eccentric loading,six multi-cell special-shaped CFST columns with non-expansive fireproof coating were designed.The fire resistance test was carried out and the parameters investigated include the cross-sectional shape and the thickness of fireproof coating.The test results indicate that the more the number of fire surfaces in each chamber of concrete-filled steel tubular special-shaped columns,the higher the central temperature of concrete.The cross section has little influence on the fire resistance of specimens with the same thickness fireproof coating.As the thickness of coating increases,the heating rates of specimens become lower,and the fire resistance becomes much longer.When the thickness of the fireproof coating exceeds 16 mm,the special-shaped CFST columns can meet the requirements of the specification for the first grade refractory component.The thermal and structural models were established using ABAQUS and the models were validated by the test results.Parametric study was then conducted on the fire performance of special-shaped CFST columns with different thickness fireproof coating.Then,the design method for predicting the thickness of the fire protection layer was proposed.

关 键 词：钢管混凝土异形柱 防火涂料 偏心加载 耐火性能 设计方法 

分 类 号：TU398.9[建筑科学—结构工程]