纯拉荷载下厚型钢结构防火涂层破损的评估方法  

Damage Assessment of Thick Fireproof Coatings for Steel Members Subjected to Axial Tensile Loading

作　　者：陈素文[1,2] 吴林森[1] 廖志娟[1] 江黎明[1] 

机构地区：[1]同济大学土木工程学院,上海200092 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《防灾减灾工程学报》2015年第1期36-43,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(50808143);上海市教育委员会科研创新重点项目(09ZZ37)资助

摘　　要：厚型钢结构防火涂层因耐火性好、性能稳定而成为最常用的防火保护形式之一,但其易在地震和冲击等作用下发生破损和脱落,从而影响钢结构的抗火性能。运用有限元分析软件ANSYS对钢板在纯拉荷载下的涂层破损试验进行模拟,验证了有限元模型;然后选取几何尺寸、涂层材性、钢板-涂层界面参数等进行参数分析,确定界面破损的主要影响因素有涂层厚度、涂层弹性模量、界面粘结强度等;涂层横向裂缝破损的主要影响因素有涂层抗拉强度、涂层弹性模量等。在参数分析的基础上,提出纯拉荷载下钢板件涂层破损评估方法,并得到了试验的验证。Thick fireproof coatings are widely adopted for their good performance but it may be easily damaged in loadings such as earthquake and impact, which may leads to a considerable re- duction in fire resistance. In this paper, finite element models are established to simulate the damage initiation and propagation of thick fireproof coatings for steel plates under monotonic axi- al tensile loading. The verified finite element model is then adopted for parameter analysis, in which geometric parameters, material property parameters and interface parameters are ana- lyzed. It is found that interface debonding is mainly effected by the coating thickness, elastic modulus and bond strength of the coating material and transverse crack is mainly effected by the tensile strength and elastic modulus of the coating material. Based on the results from parameter analysis, a damage assessment method for thick fireproof coatings on steel members subjected to tensile loading is proposed and verified by comparing with test results.

关 键 词：厚型防火涂层 纯拉荷载 有限元分析 参数分析 评估方法 

分 类 号：TU352.1[建筑科学—结构工程]