碳纤维复材双边柔性法兰管连接柱轴压试验  

Axial Compression Experiments on Assembled Columns of CFRP Bilateral Flexible Flange Tubes

作　　者：刘承霖 李峰 李若愚 LIU Chenglin;LI Feng;LI Ruoyu(College of Field Engineering,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学野战工程学院,南京210007

出　　处：《工业建筑》2022年第9期10-17,共8页Industrial Construction

基　　金：国家自然科学基金项目(51778620)。

摘　　要：为实现复合材料薄壁圆管快速纵向拼接,提出了一种全碳纤维复材法兰连接接头。对3个法兰管构件进行轴压试验,获得了荷载-轴向位移曲线,分析了螺栓-法兰连接的受力过程和损伤形态;对2个连接柱进行了同种边界条件下的轴压试验,观察了试件的破坏形态,分析了连接柱的失稳机制。结果表明:在圆管与法兰等厚度设计下,螺栓-法兰连接的抗弯性能显著小于薄壁圆管;与金属法兰相比,复材法兰连接不易发生螺栓屈服或管壁鼓曲的失效模式,法兰与圆管的交界部位是复材法兰连接的薄弱环节,容易发生材料损伤,且会对法兰连接的转动刚度造成较大影响;复材法兰连接柱可视为一个中部带有半刚性连接节点的压杆,节点的转动刚度会随着材料损伤而变小;采用带侧移压杆失稳模型能够较好描述连接柱的失稳机制。In order to realize rapid longitudinal connection of composite thin-walled circular tubes,a lightweight all-composite flange joint was proposed.Three specimens were subjected to axial compression tests.Load-axial displacement curves were obtained,and the loading process and damage pattern of bolt-flange joints were analyzed.Then,axial compression tests were carried out on two assembled columns under the same boundary condition.The failure modes of the specimens were observed and the instability mechanism of the columns were analyzed.The results showed that under the same thickness design of the tube and flange,the flexure performance of the bolt-flange joint was significantly lower than that of the tube;compared with metal flanges,the failure modes of bolt yield or tube wall buckling were less likely to occur in the composite flange tube,and the junction of the flange and tube was the weak area of the composite flange joint,which was prone to material damage and had a great influence on the rotational stiffness of the joint;the assembled column could be regarded as a strut with a non-rigid connecting joint in the middle,and the change of rotational stiffness of the joint due to material damage had a direct impact on the overall stability of the strut;the lateral instability model of struts could be used to describe the instability mechanism of the assembled column.

关 键 词：CFRP双边柔性法兰管 复材法兰连接 轴压性能 整体稳定性 

分 类 号：TU317[建筑科学—结构工程]