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FRP pipe concrete steel tube composite column (DSTC) is proposed by Professor Teng Jinguang, Hong Kong Polytech University, a new type of composite structure. In order to further study the axial compression performance of DSTC, this paper makes a deep research on the DSTC in different sizes under different conditions by the finite element simulation. According to the results of experiment and simulation, it can be known that, with the increase of the size of the specimen, the ability of resisting deformation is weakened, the effect of size effect on the mechanical properties of different concrete strength grade of DSTC is different, and the effect of size effect on the high grade concrete is less than that of the low grade concrete.

Study on Size Effect of GFRP Tube Concrete Steel Tube Composite Column under Axial Compression