单肋型装配式钢牛腿抗火性能试验研究  

Experimental study on fire resistance of single rib fabricated steel corbels

作　　者：钱斌 毛小勇[1] 刘冰 王广勇 Qian Bin;Mao Xiaoyong;Liu Bing;Wang Guangyong(Suzhou University of Science and Technology,Suzhou 215011,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011 [2]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2021年第7期65-71,87,共8页Building Science

基　　金：国家重点研发计划项目(2018YFC0807600);国家自然科学基金项目(51778396);江苏省研究生科研创新计划项目(SJCX19_0836);。

摘　　要：考虑肋板厚度、偏心距、承载、保护套类型等参数,进行了6个不同形式的单肋型装配式钢牛腿的抗火性能试验。测试了升温过程中节点的变形、温度场分布和耐火极限,观察了试件的破坏形式。试验结果表明:对于无保护外套的单肋型装配式钢牛腿,肋板厚度、偏心距和承载是影响其抗火性能的主要因素,耐火极限随肋板厚度增大而增加,随荷载和偏心距增大而减小。其高温下的主要薄弱部位是上排螺栓和肋板。对于有保护套的单肋型装配式钢牛腿,保护套对牛腿抗火性能起到显著的影响,但不同材质保护套的破坏形态各不相同。素混凝土保护套高温下龟裂剥落,耐火浇筑料烧制的保护套高温下承压开裂,陶瓷纤维混凝土保护套性能优异。In order to study the fire resistance of prefabricated steel corbels,the fire resistance of single-rib prefabricated steel corbelsis is studied and a numerical simulation is carried out.Considering the thickness of floor,eccentricity,load and the type of protective cover,six different forms of single-rib prefabricated steel corbels are tested for the fire resistance.The deformation,temperature distribution,fire resistance and failure modes of the specimens are recorded and presented.The test results show that the thickness of rib,eccentricity and load are the main factors affecting the fire resistance of the single-rib prefabricated steel corbels without protective cover.The larger the thickness of rib,the larger the fire resistance;the larger the load,the smaller the fire resistance;the larger the eccentricity,the smaller the fire resistance.The main weak parts under high temperature are the upper row bolts and ribs.For the single-rib prefabricated steel corbels with protective cover,the material of the protective cover has a significant influence on the fire-resistance performance,but the failure modes of different materials are different.The results show that the plain concrete cover cracks and peels under high temperature,the protective sleeve made of refractory pouring material cracks under high temperature,and the ceramic fiber concrete protective cover has excellent performance.

关 键 词：装配式 钢牛腿 抗火试验 耐火极限 有限元模拟 

分 类 号：TU541[建筑科学—建筑技术科学]