摘要
火灾后,钢构件残余应力和变形的重新分布,导致钢结构整体在火灾后可能比火灾高温作用下更加危险.节点对钢结构整体安全性至关重要,为研究高强钢平齐式端板连接节点火灾后的力学性能,采用稳态试验方法对经历550℃的火灾高温并冷却至常温的7个端板连接节点进行试验,得到节点火灾后的变形状态、弯矩-转角关系曲线以及失效模式等.同时,将试验结果与普通钢端板连接节点过火后的力学性能进行对比分析.此外,将试验结果同现行欧洲钢结构设计规范Eurocode3中相应条文进行比较.研究表明:通过合理的节点设计,与采用较厚普通钢端板的节点相比,采用较薄高强钢端板的节点可实现相同的节点失效模式、相近的剩余承载力以及更高的(至少是相当的)节点转动能力;同时,欧洲钢结构规范Eurocode3中有关节点塑性抗弯承载力的条文适用于高强钢平齐式端板连接节点火灾后塑性抗弯承载力的预测.
After fire,residual forces and deformations are re-developed inevitably in steel structures,and it may cause more dangerous consequence than that in fire condition.Beam-column connections are very important parts for the whole structure.In order to reveal more information about high strength steel flush endplate connection,an experimental study on mechanical behaviour of high strength steel flush endplate connections was carried out.Seven flush endplate connections were tested after cooling down from 550℃.The final deformation,moment-rotation curves and failure mode of high strength steel flush endplate connections were obtained and compared with those of mild steel flush endplate connections.Moreover,the provisions of Eurocode 3 were validated with the test results.It is found that a thinner high strength steel endplate can achieve similar residual load-bearing capacity and comparable or even higher rotation capacity after fire,in comparison with a connection with thicker mild steel endplate.Meanwhile,the provisions of Eurocode 3 for plastic flexural resistance of endplate connections are applicable when used to predict the behavior of high strength steel flush endplate connection after fire.
作者
强旭红
石志伟
赵国栋
姜旭
宋杰
任楚超
QIANG Xuhong;SHI Zhiwei;ZHAO Guodong;JIANG Xu;SONG Jie;REN Chuchao(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education,Shanghai 200092,China;Shandong Provincial Academy of Building Research,Jinan 250031,China;Chongqing Vocational College of Transportation,Chongqing 402247,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第1期9-21,共13页
Journal of Hunan University:Natural Sciences
基金
国家重点研发计划重点专项(2017YFB0304701)
国家自然科学基金资助项目(51408150)
国家财政部项目((2013)235)
中央高校基本科研业务费专项资金资助项目(2014KJ044)~~
关键词
高强钢
平齐式端板连接节点
火灾后
试验研究
力学性能
失效模式
high strength steel
flush endplate connection
after fire
experimental study
mechanical behavior
failure mode
