(1 青岛理工大学土木工程学院, 青岛 266033; 2 东南大学土木工程学院, 南京 210096;3 中亿丰建设集团股份有限公司, 苏州 215131)

摘要: 对一种新型装配式钢混组合梁柱节点开展了足尺火灾试验,对比分析了节点梁和节点柱不同截面不同测点的温度场. 同时基于有限元软件 ABAQUS 进行了梁柱节点受火下温度场的模拟分析,分析结果与试验结果吻合良好,验证了模型的可靠性. 研究结果表明,1)新型装配式钢混组合梁柱节点在火灾下的温度场分布呈外高内低的趋势,在受火 1h 后,试件梁柱截面表层 50mm 以内的混凝土最高温度基本在 400℃左右,而截面中心处温度均在200℃以下,预测梁柱节点的承载能力下降有限;2)梁端钢接头的存在会使梁温度场发生重分布;3)火灾下梁柱节点核心区温度较低,是相对安全的.

关键词: 装配式; 钢混组合梁柱节点; 火灾试验; 温度场; 有限元模拟

中图分类号:TU398+. 2 文献标志码:A 文章编号:1002-848X(2023)11-0081-07

DOI:10. 19701 / j. jzjg. 20210501

Research on temperature field of a new assembled steel-concrete composite beam-column joint under fire

JIANG Huanzhi1,2, PAN Jie2, GUO Zhengxing2, GONG Changyi3

(1 College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;2 School of Civil Engineering, Southeast University, Nanjing 210096, China;3 Zhongyifeng Construction Group Co. , Ltd. , Suzhou 215131, China)

Abstract: The fire experimental study was carried out on a full-scale new assembeled steel-concrete compositebeam-column joint. The temperature field under fire of different sections and different measuring points of joint beam andjoint column were compared and analyzed. Finite element analysis was also conducted based on the software ABAQUS tosimulate the temperature field of beam-column joint under fire. The analysis results were in good agreement with the testresults, which verifies the reliability of the model. The results show that: 1) the temperature field distribution of the newassembled steel-concrete composite beam-column joint under fire was gradually decreasing from the outside to the inside.After one hour of fire, the maximum temperature of the concrete within 50mm of the surface layer of the beam columnsection reached about 400℃ , while the temperature of the concrete at the core of the section was below 200℃ , whichindicates that the decrease in bearing capacity of the joint was limited; 2) the existence of steel joint at the end of beamwould make the temperature field redistribute; 3) the temperature in the core area of beam-column joint under fire was lowand relatively safe.

Keywords:assembled; steel-concrete composite beem-column joint; fire test; temperature field; finite element simulation

∗国家重点研发计划 ( 2016YFC0701703), 国家自然科学基金 ( 51678136), 青岛理工大学 ( 临沂) 博士科研启动基金(20312001),青岛理工大学临沂校区自然科学重点培育科研项目资助(20304116),青岛理工大学临沂校区自然科学基金项目资助(20304123、2030404).

第一作者:江焕芝,博士,讲师,主要从事装配式建筑结构设计和施工等相关研究,Email: jianghuanzhi@ qut. edu. cn.

[引用本文] 江焕芝,潘杰,郭正兴,等. 新型装配式钢混组合梁柱节点受火温度场研究[ J]. 建筑结构,2023,53(11):81-87. JIANG Huanzhi,PAN Jie,GUO Zhengxing,et al. Research on temperature field of a new assembled steelconcrete composite beam-column joint under fire[J]. Building Structure,2023,53(11):81-87.