基于Johansen屈服模式的胶合木节点标准火灾承载力模型  

Load-carrying capacity model of glulam connections exposed to standard fire based on Johansen's model

作　　者：罗晶 何敏娟[2] Luo Jing;He Minjuan(School of Civil Engineering,Shanghai Normal University,Shanghai 201400,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海师范大学建筑工程学院,上海201400 [2]同济大学土木工程学院,上海200092

出　　处：《消防科学与技术》2023年第7期892-896,共5页Fire Science and Technology

基　　金：上海市青年科技英才扬帆计划(23YF1430900)。

摘　　要：开发了节点常温力学有限元模型和高温下热传递有限元模型,基于Johansen屈服理论提出了节点常温及火灾下的承载力计算方法。通过随温度变化的销槽承压强度双折线折减关系,得到销槽承压强度随螺栓长度的积分,并基于3种主要破坏模式的力学分析,得到不同持荷比下节点的耐火时间,计算结果与试验值较为接近。Finite element models of connections at normal temperature and heat transfer models at elevated temperature are conducted.A calculation method is proposed to determine the carry ing capacity of connections under normal and fire conditions based on the Johansen's model.By considering the temperature-dependent double-spline reduction relationship of the embedment strength,the integrated embedment strength with respect to the bolt length is obtained.Furthermore,through mechanical analysis based on three major failure modes,the fire resistance time of connections under different load ratios is determined.The calculated results show a close correlation with experimental values,providing valuable references for engineering design.

关 键 词：标准火灾 胶合木节点 Johansen屈服模式 

分 类 号：X913.4[环境科学与工程—安全科学] TU541[建筑科学—建筑技术科学]