Experimental Study on Axial Compressive Behavior of Concrete-Filled FRP Filament-winded Tubes

Yunlou Sun, Yujun Qi, Weiqing Liu


Concrete-Filled Fiber-Reinforced Polymer (FRP) Tubes (CFFTs) have an advantage that is the superior workability in site, compared with FRP-Wrapped Concrete Columns (FWCCs), which have a high load-bearing capacity and ductility. An axial compressive test for three specimens with different thickness of GFRP tube was employed to understand the compressive behavior of CFFTs. The failure modes, load-displacement relationships and ultimate compressive loads were obtained. Then, the experimental and theoretical load-displacement relationships were compared. The result shows that the Lu’s model can predict the load-displacement relationships of CFFTs accurately, and another model may be employed to predict the compressive bearing load of CFFTs simply and effectively. Based on Lu’s model, the effects of thickness of FRP tubes on compressive performance of CFFTs were studied through parameter analysis, and the result shows that: both of compressive bearing capacity and ductility of CFFTs increase with the increasing thickness of GFRP tubes and the increasing rate of compressive bearing capacity increase with the increasing thickness of GFRP tube.


Fiber-Reinforced Polymer (FRP); Concrete-Filled FRP Tubes (CFFTs); load-bearing capacity; ductility; failure mode

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