Research On The Axial Compression Bearing Capacity And Hysteretic Performance Of GFRP Tube-confined Concrete Short Columns

GFRP tube-confined concrete column is a type of composite column in which concrete is poured into a pre-made GFRP tube.It has so many advantages,such as high bearing capacity,good plasticity and toughness,corrosion resistance,convenient construction etc.,that will contribute to the development of contemporary engineering structure in large span,towering and heavy load.In this paper,the axial compression bearing capacity and hysteretic behavior of short GFRP tube-confined concrete columns are studied.The main contents are as follows:Finite element models of the short GFRP tube-confined concrete column are established in the commercial finite element software ABAQUS,and the accuracy of the models are verified by the axial compression tests.The force mechanism of the GFRP tube-confined concrete columns is revealed through the analysis of the distribution of components' stress and strain.The accuracy of the calculation formula of ultimate bearing capacity based on yield criterion of the GFRP tube is verified according to the results of comparative analysis of theory,tests and numerical simulation.The ABAQUS simulations of the hysteresis curves of 40 components under the action of axial pressure and horizontal reciprocating force are conducted,and the results show the influences of different factors such as GFRP tube,axial compression ratio,tube thickness,slenderness ratio and concrete grade on hysteretic behavior of components.The study shows that the GFRP tube increases the strength and deformation capacity of core concrete and improves the ductility and energy dissipation capacity of columns,so the seismic performances of columns are advanced.