拼接GFRP管混凝土构件轴心受压性能

Axial Compression Performance of Splicing Concrete-Filled GFRP Tubular Composite Component

拼接GFRP管混凝土组合构件是在两个独立的GFRP管拼接处设置连接件，再在内部浇筑混凝土，形成一种连续整体的GFRP管混凝土组合构件．通过试验，研究了基于3种连接（钢筋、钢板钢筋及钢管连接）的拼接GFRP管混凝土组合构件的受力机理和破坏模式．结果表明，当加载到（30％-40％）Pu（极限荷载）时，在GFRP管表面开始出现白纹；当加载到（60％-70％）Pu时，GFRP管对核心混凝土开始产生套箍约束作用；继续加载，套箍约束作用继续存在．拼接构件的破坏发生在构件端部，连接处没有发生破坏，而连续整体构件破坏发生在中部位置，表明3种连接均能保证拼接GFRP管混凝土轴压构件正常工作．

The splicing concrete-filled GFRP tube composite members is a new kind of composite member, which is composed of two independent GFRP tubes connected by connectors with poured concrete inside. The mechanical behavior and failure modes of splicing and continuous concrete- filled GFRP tubular composite member connected by steel bars, steel plates and steel tube under axial load were studied. The results indicated that white stripes appeare on the surface of GFRP tube when the load reaches about （30% -40% ）Pu （limit load）, and the confinement effect of GFRP tube are motivated when the load reaches （60% ~ 70% ）Pu. The failure of splicing specimens occurrs near the end of connectors instead of the splicing joint. However, the failure of the continuous specimen occurrs in the middle of the specimen. Results show that the influence of the three connecting ways can ensure the normal work of splicing concrete-filled structures.