基于Johansen屈服模式的胶合木节点标准火灾承载力模型

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (7): 892-896.

基于Johansen屈服模式的胶合木节点标准火灾承载力模型

罗晶1,2, 何敏娟2

（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）

出版日期:2023-07-15 发布日期:2023-07-15
作者简介:罗晶（1994— ），女，湖南株洲人，上海师范大学建筑工程学院讲师，博士，主要从事绿色低碳木结构研究，上海市奉贤区海思路100号上海师范大学建筑工程学院，201400。
基金资助:
基金项目：上海市青年科技英才扬帆计划（23YF1430900）

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

Luo Jing1,2, He Minjuan2

(1. School of Civil Engineering, Shanghai Normal University, Shanghai 201400, China;2. College of Civil Engineering, Tongji University, Shanghai 200092, China)

Online:2023-07-15 Published:2023-07-15

摘要/Abstract

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。

关键词: 标准火灾, 胶合木节点, Johansen屈服模式

Abstract: 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 carrying 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.

Key words: standard fire, glulam connections, Johansen's model

罗晶, 何敏娟. 基于Johansen屈服模式的胶合木节点标准火灾承载力模型[J]. 消防科学与技术, 2023, 42(7): 892-896.

Luo Jing, He Minjuan. Load⁃carrying capacity model of glulam connections exposed to standard fire based on Johansen's model[J]. Fire Science and Technology, 2023, 42(7): 892-896.